Endangered and Threatened Wildlife and Plants; Threatened Species Status With Section 4(d) Rule for Longsolid and Round Hickorynut and Designation of Critical Habitat, 14794-14869 [2023-03998]
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DEPARTMENT OF THE INTERIOR
Fish and Wildlife Service
50 CFR Part 17
[Docket No. FWS–R4–ES–2020–0010;
FF09E21000 FXES1111090FEDR 234]
RIN 1018–BD32
Endangered and Threatened Wildlife
and Plants; Threatened Species Status
With Section 4(d) Rule for Longsolid
and Round Hickorynut and
Designation of Critical Habitat
Fish and Wildlife Service,
Interior.
ACTION: Final rule.
AGENCY:
We, the U.S. Fish and
Wildlife Service (Service), determine
threatened species status under the
Endangered Species Act of 1973 (Act),
as amended, for the longsolid
(Fusconaia subrotunda) and round
hickorynut (Obovaria subrotunda),
freshwater mussels. We also designate
critical habitat for both species. For the
longsolid, in total, approximately 1,115
river miles (1,794 river kilometers) fall
within 12 units of critical habitat in
Pennsylvania, Kentucky, West Virginia,
Virginia, Tennessee, and Alabama. For
the round hickorynut, in total,
approximately 921 river miles (1,482
river kilometers) fall within 14 units of
critical habitat in Pennsylvania, Ohio,
Indiana, Kentucky, West Virginia,
Tennessee, Alabama, and Mississippi.
We also finalize a rule under the
authority of section 4(d) of the Act for
both species that provides measures that
are necessary and advisable to provide
for the conservation of these species.
DATES: This rule is effective April 10,
2023.
ADDRESSES: This final rule is available
on the internet at https://
www.regulations.gov. Comments and
materials we received are available for
public inspection at https://
www.regulations.gov at Docket No.
FWS–R4–ES–2020–0010.
Supporting materials we used in
preparing this rule, such as the species
status assessment reports and
supporting information that we
developed for the critical habitat
designation, are available at https://
www.regulations.gov at Docket No.
FWS–R4–ES–2020–0010. For the critical
habitat designation, the coordinates or
plot points or both from which the maps
are generated are included in the
decision file and are available at https://
www.regulations.gov at Docket No.
FWS–R4–ES–2020–0010, and on the
Service’s Environmental Conservation
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SUMMARY:
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Online System (ECOS) website at
https://ecos.fws.gov/ecp/species/9880
and https://ecos.fws.gov/ecp/species/
9879.
FOR FURTHER INFORMATION CONTACT:
Janet Mizzi, Field Supervisor, U.S. Fish
and Wildlife Service, Asheville
Ecological Services Field Office, 160
Zillicoa St., Asheville, NC 28801;
telephone 828–258–3939. Individuals in
the United States who are deaf,
deafblind, hard of hearing, or have a
speech disability may dial 711 (TTY,
TDD, or TeleBraille) to access
telecommunications relay services.
Individuals outside the United States
should use the relay services offered
within their country to make
international calls to the point-ofcontact in the United States.
SUPPLEMENTARY INFORMATION:
Executive Summary
Why we need to publish a rule. Under
the Act, a species warrants listing if it
meets the definition of an endangered
species (in danger of extinction
throughout all or a significant portion of
its range) or a threatened species (likely
to become endangered within the
foreseeable future throughout all or a
significant portion of its range). If we
determine that a species warrants
listing, we must list the species
promptly and designate the species’
critical habitat to the maximum extent
prudent and determinable. We have
determined that the longsolid and round
hickorynut meet the definition of
threatened species; therefore, we are
listing them as such and finalizing a
designation of their critical habitat. Both
listing a species as an endangered or
threatened species and designating
critical habitat can be completed only
by issuing a rule through the
Administrative Procedure Act
rulemaking process (5 U.S.C. 551 et
seq.).
What this document does. This rule
lists the longsolid and round hickorynut
as threatened species, and issues
regulations under section 4(d) of the Act
(a ‘‘4(d) rule’’) for the conservation of
both species. This rule designates
critical habitat for the longsolid in 12
units totaling approximately 1,115 river
miles (mi) (1,794 river kilometers (km))
within portions of 7 counties in
Pennsylvania, 16 counties in Kentucky,
10 counties in West Virginia, 4 counties
in Virginia, 6 counties in Tennessee,
and 3 counties in Alabama.
Additionally, this rule designates
critical habitat for the round hickorynut
in 14 units totaling approximately 921
river mi (1,482 river km) within
portions of 2 counties in Pennsylvania,
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3 counties in Ohio, 4 counties in
Indiana, 18 counties in Kentucky, 11
counties in West Virginia, 3 counties in
Tennessee, 3 counties in Alabama, and
1 county in Mississippi.
The basis for our action. Under the
Act, we may determine that a species is
an endangered or threatened species
based on any of five factors: (A) The
present or threatened destruction,
modification, or curtailment of its
habitat or range; (B) overutilization for
commercial, recreational, scientific, or
educational purposes; (C) disease or
predation; (D) the inadequacy of
existing regulatory mechanisms; or (E)
other natural or manmade factors
affecting its continued existence. We
have determined that the longsolid and
round hickorynut are threatened species
due to the following threats: habitat
degradation or loss (Factor A) from a
variety of sources (e.g., dams and other
barriers, resource extraction); degraded
water quality from chemical
contamination and erosion from
development, agriculture, mining, and
forest conversion (Factor A); direct
mortality from dredging (Factor E);
residual impacts (reduced population
size) from historical harvest (Factor B);
and the proliferation of invasive,
nonnative species (Factor E). These
threats also contribute to the negative
effects associated with the species’
small population sizes (Factor E).
Section 4(a)(3) of the Act requires the
Secretary of the Interior (Secretary) to
designate critical habitat concurrent
with listing to the maximum extent
prudent and determinable. Section
3(5)(A) of the Act defines critical habitat
as (i) the specific areas within the
geographical area occupied by the
species, at the time it is listed, on which
are found those physical or biological
features (I) essential to the conservation
of the species and (II) which may
require special management
considerations or protections; and (ii)
specific areas outside the geographical
area occupied by the species at the time
it is listed, upon a determination by the
Secretary that such areas are essential
for the conservation of the species.
Section 4(b)(2) of the Act states that the
Secretary must make the designation on
the basis of the best scientific data
available and after taking into
consideration the economic impact, the
impact on national security, and any
other relevant impacts of specifying any
particular area as critical habitat.
Previous Federal Actions
Please refer to the proposed listing
and critical habitat rule (85 FR 61384)
for the longsolid and round hickorynut
published on September 29, 2020, for a
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detailed description of previous Federal
actions concerning these species.
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Peer Review
A species status assessment (SSA)
team prepared SSA reports for the
longsolid and round hickorynut. The
SSA team was composed of Service
biologists, in consultation with other
species experts. The SSA reports
represent a compilation of the best
scientific and commercial data available
concerning the status of each of the
species, including the impacts of past,
present, and future factors (both
negative and beneficial) affecting them.
In accordance with our joint policy on
peer review published in the Federal
Register on July 1, 1994 (59 FR 34270),
and our August 22, 2016, memorandum
updating and clarifying the role of peer
review of listing actions under the Act,
we solicited independent scientific
review of the information contained in
the SSA reports. As discussed in the
proposed rule, we sent the SSA reports
to 10 independent peer reviewers on
both the longsolid and round
hickorynut and received 3 responses on
the longsolid SSA report, and no
responses on the round hickorynut SSA
report. The peer reviews for the
longsolid SSA report can be found at
https://www.regulations.gov at Docket
No. FWS–R4–ES–2020–0010. In
preparing the proposed rule, we
incorporated the results of these
reviews, as appropriate; both SSA
reports were the foundation for the
proposed rule and this final rule. A
summary of the peer review comments
and our responses can be found in the
Peer Reviewer Comments section of this
final rule.
Summary of Changes From the
Proposed Rule
This final rule incorporates several
changes from what was contained in our
proposed rule (85 FR 61384; September
29, 2020) based on the comments we
received during the comment period.
Minor, nonsubstantive changes and
corrections were made throughout this
rule and in the SSA reports in response
to comments (e.g., updated range map
for round hickorynut based on survey
information in Ohio, revised forest
conversion section in the discussion of
threats). The information we received
during the comment period did not
change our determination that the
longsolid and round hickorynut are
threatened species.
We received substantive comments on
the proposed listing and proposed 4(d)
rule (see Summary of Comments and
Recommendations, below), and we
made changes as follows:
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• We received comments from
multiple State agencies across the
ranges of the longsolid and round
hickorynut. The State agencies generally
concurred with our methods and
conclusions, and provided additional
information, clarifications, and
suggestions associated with threats to
the longsolid and round hickorynut.
Minor edits associated with threats and
their association with populations in
West Virginia have been incorporated
into the preamble of this rule, and
additional citations have been added to
support statements regarding
contaminants and resource extraction
and their effects on stream habitats and
macroinvertebrates. These added
citations are Pond et al. (2008) and
Entrekin et al. (2015). Additionally,
special management recommendations
for the nonnative round goby
(Neogobius melanostomus) have been
incorporated into the discussion of the
longsolid’s French Creek critical habitat
unit (Unit LS 1) in Pennsylvania.
• We received comments requesting
clarification of broodstocking activities
as they relate to the 4(d) exception
associated with conservation and
restoration efforts by State wildlife
agencies. Accordingly, the first
exception for incidental take associated
for both species’ 4(d) rules clarifies this
activity includes population monitoring,
relocation, and collection of broodstock;
tissue collection for genetic analysis;
captive propagation; and subsequent
stocking into currently occupied and
unoccupied areas within both species’
historical ranges.
• We received comments requesting
clarification on the third exception in
the 4(d) rule for bank restoration
projects that use bioengineering
methods to reduce bank erosion and
instream sedimentation and improve
habitat conditions for both species.
Specifically, the commenter indicated,
and we agree, that this exception should
be referred to as bank stabilization
projects, which may include channel
restoration activities, and relocation of
mussels prior to implementation of
these types of projects may be (as
opposed to must be) necessary.
Accordingly, this exception of the 4(d)
rule reflects these changes.
• Several commenters indicated that
the Service should consider forest
management best management practices
(BMPs; i.e., practices that reduce the
amount of nonpoint pollution from
forest management) as part of the overall
conservation benefit for the species,
account for these beneficial actions in
any threat analysis, and incorporate an
associated exception into the 4(d) rules
for both species. Additionally,
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Warrington et al. (2017) was described
as being cited erroneously in the
proposed rule’s preamble. Forested
watersheds contribute to the current
condition of each species and have been
factored in as a positive factor (i.e.,
benefit) in the SSAs and proposed rule.
State-approved forest management
BMPs vary across the large geographic
areas occupied by the longsolid and
round hickorynut, but we support and
encourage their use throughout the
species’ ranges. Accordingly, this final
rule includes an exception to the
prohibitions in both species’ 4(d) rules
for State-approved forest management
BMPs in response to public comments
we received on the proposed rule.
We also note that forestry activities
were not a primary threat in our current
and future condition analyses, and that
the conversion of forested habitats to
other land uses, such as agriculture or
urban development, contribute to
greater habitat and water quality
degradation than forest management.
Clarity regarding forest conversion to
other land uses, not forestry, and its
contribution to freshwater mussel
habitat degradation and loss has been
incorporated into the preamble of this
rule. Several populations of the
longsolid and round hickorynut occur
on U.S. Forest Service lands; therefore,
any actions that may affect these
populations are subject to section 7
consultation under the Act (16 U.S.C.
1531 et seq.).
This rule does not make any changes
to the boundaries of the proposed
critical habitat designation for either
species based on public comments we
received.
I. Final Listing Determination
Background
Please refer to the September 29,
2020, proposed rule (85 FR 61384) and
the SSA reports for full summaries of
species information. These documents
are available at https://
www.regulations.gov under Docket No.
FWS–R4–ES–2020–0010, and on the
ECOS website at https://ecos.fws.gov/
ecp/species/9880 and https://
ecos.fws.gov/ecp/species/9879.
The longsolid (Fusconaia subrotunda)
is a freshwater river mussel belonging to
the Unionidae family, also known as the
naiads and pearly mussels. Longsolid
adults are light brown in color,
darkening with age. The shell is thick
and medium-sized (up to 5 inches (in)
(125 millimeters (mm)), and typically
has a dull sheen (Williams et al. 2008,
p. 322). There is variability in the
inflation of the shell depending on
population and latitudinal location
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(Ortmann 1920, p. 272; Watters et al.
2009, p. 130).
The longsolid is currently found in
the Ohio, Cumberland, and Tennessee
River basins, overlapping within the
States of Alabama, Kentucky, New York,
North Carolina, Ohio, Pennsylvania,
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Tennessee, Virginia, and West Virginia
(Service 2018, appendix A; see figure 1,
below). It is considered extirpated from
Georgia, Indiana, and Illinois.
Additionally, it is classified as an
endangered species by the State of Ohio,
and considered to have various levels of
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concern, imperilment, or vulnerability
(see table 1–1 in the SSA report) by the
States of Alabama, Kentucky, North
Carolina, Pennsylvania, Tennessee,
Virginia, and West Virginia.
BILLING CODE 4333–15–P
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Similar to the longsolid, the round
hickorynut also belongs to the
Unionidae family of naiads and pearly
mussels. Round hickorynut adult
mussels are greenish-olive to dark or
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chestnut brown, sometimes blackish in
older individuals, and may have a
yellowish band dorsally (Parmalee and
Bogan 1998, p. 168). Inflation of the
shell is variable depending on
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population and latitudinal location
(Ortmann 1920, p. 272; Williams et al.
2008, p. 474). The shell is thick, solid,
and up to 3 in (75 mm) in length, but
usually is less than 2.4 in (60 mm)
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(Williams et al. 2008, p. 473; Watters et
al. 2009, p. 209). A distinctive
characteristic is that the shell is round
in shape, nearly circular, and the umbo
(the raised portion of the dorsal margin
of a shell) is centrally located.
Within the United States, the round
hickorynut is currently found in the
Great Lakes, Ohio, Cumberland,
Tennessee, and Lower Mississippi River
basins, overlapping within the States of
Alabama, Indiana, Kentucky, Michigan,
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Mississippi, Ohio, Pennsylvania,
Tennessee, and West Virginia (Service
2019, appendix A; see figure 2, below).
It is considered extirpated from Georgia,
Illinois, and New York. Additionally, it
has State-level conservation status,
ranging across various levels of concern,
imperilment, or vulnerability (see table
1–1 in the SSA report), in the States of
Alabama, Indiana, Kentucky, Michigan,
Pennsylvania, Tennessee, and West
Virginia. The round hickorynut also
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occurs within the Canadian Province of
Ontario, where it was listed as an
endangered species in 2005, due to the
loss of and significant declines in
populations (Committee on the Status of
Species at Risk in Ontario 2013, p. 4);
a single remaining population (showing
no recruitment (Morris 2018, pers.
comm.)) occurs in Lake St. Clair and the
East Sydenham River.
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BILLING CODE 4333–15–C
Thorough reviews of the taxonomy,
life history, ecology and State listing
status of the longsolid and round
hickorynut are presented in detail in the
SSA reports (Service 2018, pp. 14, 15,
22–30; Service 2019, pp. 14, 15, 22–29).
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Regulatory and Analytical Framework
Regulatory Framework
Section 4 of the Act (16 U.S.C. 1533)
and its implementing regulations in title
50 of the Code of Federal Regulations
(CFR) set forth the procedures for
determining whether a species is an
endangered species or a threatened
species, issuing protective regulations
for threatened species, and designating
critical habitat for endangered and
threatened species. In 2019, jointly with
the National Marine Fisheries Service,
the Service issued a final rule that
revised the regulations in 50 CFR part
424 regarding how we add, remove, and
reclassify endangered and threatened
species and the criteria for designating
listed species’ critical habitat (84 FR
45020; August 27, 2019). On the same
day, the Service also issued final
regulations that, for species listed as
threatened species after September 26,
2019, eliminated the Service’s general
protective regulations automatically
applying to threatened species the
prohibitions that section 9 of the Act
applies to endangered species (84 FR
44753; August 27, 2019). We
collectively refer to these actions as the
2019 regulations.
As with the proposed rule, the
regulations that are in effect and
therefore applicable to this final rule are
50 CFR part 424, as amended by (a)
revisions that we issued jointly with the
National Marine Fisheries Service in
2019 regarding both the listing,
delisting, and reclassification of
endangered and threatened species and
the criteria for designating listed
species’ critical habitat (84 FR 45020;
August 27, 2019); and (b) revisions that
we issued in 2019 eliminating for
species listed as threatened species are
September 26, 2019, the Service’s
general protective regulations that had
automatically applied to threatened
species the prohibitions that section 9 of
the Act applies to endangered species
(84 FR 44753; August 27, 2019).
The Act defines an ‘‘endangered
species’’ as a species that is in danger
of extinction throughout all or a
significant portion of its range, and a
‘‘threatened species’’ as a species that is
likely to become an endangered species
within the foreseeable future throughout
all or a significant portion of its range.
The Act requires that we determine
whether any species is an endangered
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species or a threatened species because
of any of the following factors:
(A) The present or threatened
destruction, modification, or
curtailment of its habitat or range;
(B) Overutilization for commercial,
recreational, scientific, or educational
purposes;
(C) Disease or predation;
(D) The inadequacy of existing
regulatory mechanisms; or
(E) Other natural or manmade factors
affecting its continued existence.
These factors represent broad
categories of natural or human-caused
actions or conditions that could have an
effect on a species’ continued existence.
In evaluating these actions and
conditions, we look for those that may
have a negative effect on individuals of
the species, as well as other actions or
conditions that may ameliorate any
negative effects or may have positive
effects.
We use the term ‘‘threat’’ to refer in
general to actions or conditions that are
known to or are reasonably likely to
negatively affect individuals of a
species. The term ‘‘threat’’ includes
actions or conditions that have a direct
impact on individuals (direct impacts),
as well as those that affect individuals
through alteration of their habitat or
required resources (stressors). The term
‘‘threat’’ may encompass—either
together or separately—the source of the
action or condition or the action or
condition itself.
However, the mere identification of
any threat(s) does not necessarily mean
that the species meets the statutory
definition of an ‘‘endangered species’’ or
a ‘‘threatened species.’’ In determining
whether a species meets either
definition, we must evaluate all
identified threats by considering the
expected response by the species, and
the effects of the threats—in light of
those actions and conditions that will
ameliorate the threats—on an
individual, population, and species
level. We evaluate each threat and its
expected effects on the species, then
analyze the cumulative effect of all of
the threats on the species as a whole.
We also consider the cumulative effect
of the threats in light of those actions
and conditions that will have positive
effects on the species, such as any
existing regulatory mechanisms or
conservation efforts. The Secretary
determines whether the species meets
the definition of an ‘‘endangered
species’’ or a ‘‘threatened species’’ only
after conducting this cumulative
analysis and describing the expected
effect on the species now and in the
foreseeable future.
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The Act does not define the term
‘‘foreseeable future,’’ which appears in
the statutory definition of ‘‘threatened
species.’’ Our implementing regulations
at 50 CFR 424.11(d) set forth a
framework for evaluating the foreseeable
future on a case-by-case basis. The term
‘‘foreseeable future’’ extends only so far
into the future as the Services can
reasonably determine that both the
future threats and the species’ responses
to those threats are likely. In other
words, the foreseeable future is the
period of time in which we can make
reliable predictions. ‘‘Reliable’’ does not
mean ‘‘certain’’; it means sufficient to
provide a reasonable degree of
confidence in the prediction. Thus, a
prediction is reliable if it is reasonable
to depend on it when making decisions.
It is not always possible or necessary
to define the foreseeable future as a
particular number of years. Analysis of
the foreseeable future uses the best
scientific and commercial data available
and should consider the timeframes
applicable to the relevant threats and to
the species’ likely responses to those
threats in view of its life-history
characteristics. Data that are typically
relevant to assessing the species’
biological response include speciesspecific factors such as lifespan,
reproductive rates or productivity,
certain behaviors, and other
demographic factors.
Analytical Framework
The SSA reports document the results
of our comprehensive biological review
of the best scientific and commercial
data regarding the status of both species,
including an assessment of potential
threats to the species. The SSA reports
do not represent our decision on
whether either species should be listed
as an endangered or threatened species
under the Act. However, they do
provide the scientific basis that informs
our regulatory decisions, which involve
the further application of standards
within the Act and its implementing
regulations and policies.
To assess the longsolid’s and round
hickorynut’s viability, we used the three
conservation biology principles of
resiliency, redundancy, and
representation (Shaffer and Stein 2000,
pp. 306–310). Briefly, resiliency is the
ability of the species to withstand
environmental and demographic
stochasticity (for example, wet or dry,
warm or cold years), redundancy is the
ability of the species to withstand
catastrophic events (for example,
droughts, large pollution events), and
representation is the ability of the
species to adapt to both near-term and
long-term changes in its physical and
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biological environment (for example,
climate changes, pathogen). In general,
species viability will increase with
increases in resiliency, redundancy, and
representation (Smith et al. 2018, p.
306). Using these principles, we
identified the species’ ecological
requirements for survival and
reproduction at the individual,
population, and species levels, and
described the beneficial and risk factors
influencing the species’ viability.
The SSA process can be categorized
into three sequential stages. During the
first stage, we evaluated the individual
species’ life-history needs. The next
stage involved an assessment of the
historical and current condition of the
species’ demographics and habitat
characteristics, including an
explanation of how the species arrived
at its current condition. The final stage
of the SSA involved making predictions
about the species’ responses to positive
and negative environmental and
anthropogenic influences. Throughout
all of these stages, we used the best
available information to characterize
viability as the ability of a species to
sustain populations in the wild over
time. We use this information to inform
our regulatory decision.
The following is a summary of the key
results and conclusions from the SSA
reports for the longsolid and round
hickorynut; the full SSA reports can be
found on https://www.regulations.gov at
Docket FWS–R4–ES–2020–0010, and on
the Service’s ECOS website at https://
ecos.fws.gov/ecp/species/9880 and
https://ecos.fws.gov/ecp/species/9879.
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Summary of Biological Status and
Threats
In this discussion, we review the
biological condition of the longsolid and
round hickorynut, their resources, and
the threats that influence both species’
current and future condition, in order to
assess each species’ overall viability and
the risks to that viability.
Species Needs
We assessed the best available
information to identify the physical and
biological needs to support individual
fitness at all life stages for the longsolid
and round hickorynut. Full descriptions
of all needs are available in chapter 4 of
the SSA reports (Service 2018, pp. 25–
30; Service 2019, pp. 30–36), which can
be found in docket number FWS–R4–
ES–2020–0010 on https://
www.regulations.gov. Based upon the
best available scientific and commercial
information, and acknowledging
existing ecological uncertainties (see
section 4.3 in the SSA reports), the
resource and demographic needs for
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both the longsolid and round
hickorynut are characterized as:
• Clean, flowing water with
appropriate water quality and temperate
conditions, such as (but not limited to)
dissolved oxygen above 2 to 3 parts per
million (ppm), ammonia generally
below 0.5 ppm total ammonia-nitrogen,
temperatures generally below 86 degrees
Fahrenheit (°F) (30 degrees Celsius (°C)),
and (ideally) an absence of excessive
total suspended solids and other
pollutants.
• Natural flow regimes that vary with
respect to timing, magnitude, duration,
and frequency of river discharge events.
• Predominantly silt-free, stable sand,
gravel, and cobble substrates.
• Suspended food and nutrients in
the water column including (but not
limited to) phytoplankton, zooplankton,
protozoans, detritus, and dissolved
organic matter.
• Availability of sufficient host fish
numbers to provide for glochidia
infestation and dispersal. Host fishes for
the longsolid are currently unknown but
likely include (but may not be limited
to): minnows of the family Cyprinidae
as well as potentially freshwater
sculpins of the genus Cottus. Host fish
species documented for the round
hickorynut include the banded sculpin
(Cottus carolinae), eastern sand darter
(Ammocrypta pellucida), emerald darter
(Etheostoma baileyi), greenside darter
(Etheostoma blennioides), Iowa darter
(Etheostoma exile), fantail darter
(Etheostoma flabellare), Cumberland
darter (Etheostoma gore), spangled
darter (Etheostoma obama), variegate
darter (Etheostoma variatum), blackside
darter (Percina maculata), and
frecklebelly darter (Percina stictogaster).
• Connectivity among populations.
Although the species’ capability to
disperse is evident through historical
occurrence of a wide range of rivers and
streams, the fragmentation of
populations by small and large
impoundments has resulted in isolation
and only patches of what once was
occupied contiguous river and stream
habitat. Genetic exchange occurs
between and among mussel beds via
sperm drift, host fish movement, and
movement of mussels during high flow
events. For genetic exchange to occur,
connectivity must be maintained. Most
freshwater mussels, including the
longsolid and round hickorynut, are
typically found in mussel beds that vary
in size and are often separated by stream
reaches in which mussels are absent or
rare (Vaughn 2012, p. 983). These
species are often a component of a
healthy mussel assemblage within
optimal mussel habitats; therefore, the
beds in which they occur are necessary
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for the species to be sufficiently resilient
over time.
Current Conditions
Current (and future) conditions are
described using categories that estimate
the overall condition of the longsolid
and round hickorynut mussel
populations. These categories include:
• High—Sufficiently resilient
populations with evidence of
recruitment and multiple age classes
represented. They are likely to maintain
viability and connectivity among
populations, and populations are not
linearly distributed (i.e., occur in
tributary streams within a management
unit). Populations are expected to
persist in 20 to 30 years and beyond and
withstand stochastic events. (Thriving;
capable of expanding range.)
• Medium—Spatially restricted
populations with limited connectivity
and reduced levels of recruitment or age
class structure. Resiliency is less than
under high conditions, but the majority
of populations (approximately 75
percent) are expected to persist beyond
20 to 30 years. (Stable; not necessarily
thriving or expanding its range.)
• Low—Small and highly restricted
populations, with no evidence of recent
recruitment or age class structure, and
limited detectability. These populations
have low resiliency, are not likely to
withstand stochastic events, and
potentially may be extirpated in 20 to 30
years. Populations are linearly
distributed within a management unit.
(Surviving and observable, but
population likely declining.)
Given the longsolid’s and round
hickorynut’s ranges include lengthy
rivers, such as the Ohio, Allegheny,
Cumberland, and Tennessee Rivers, all
of which include populations
fragmented primarily by dams, we
identified separate populations for each
hydrologic unit code (HUC) (Seaber et
al. 1987, entire; U.S. Geological Survey
2018, entire) at the fourth of 12 levels
(i.e., HUC–8 watershed). The HUC–8
watersheds are analogous to mediumsized river basins across the United
States. Our analysis describes
conditions relevant to longsolid and
round hickorynut populations and the
overarching HUC–8 watersheds,
identified herein as a ‘‘management
unit.’’ A management unit could harbor
one or more populations. See chapter 2
in the SSA reports for further
explanation of the analysis methodology
(Service 2018, pp. 15–19; Service 2019,
pp. 17–22).
Longsolid
The longsolid’s current range extends
over nine States, including New York,
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Pennsylvania, West Virginia, Ohio,
Kentucky, Virginia, Tennessee, North
Carolina, and Alabama; the species is
now considered extirpated in Georgia,
Illinois, and Indiana. This range
encompasses three major river basins
(the Ohio, Cumberland, and Tennessee
basins); the species now no longer exists
in the Great Lakes basin (loss of six
historical populations and four
management units). In addition, its
representation in the Cumberland River
basin is currently within a single
population and management unit (loss
of nine historical populations and eight
management units). Overall, the
longsolid is presumed extirpated from
62 percent (100 of 160 populations) of
its historically occupied populations,
including 6 populations (the entirety) in
the Great Lakes basin, 62 populations in
the Ohio River basin, 8 populations in
the Cumberland River basin, and 24
populations in the Tennessee River
basin (see appendix B in the SSA report
(Service 2018, pp. 131–154)). Of the
current populations, 3 (5 percent) are
estimated to be highly resilient, 8 (13
percent) are estimated to be moderately
resilient, and 49 (79 percent) are
estimated to have low resiliency.
The longsolid was once a common,
occasionally abundant component of the
mussel assemblage in rivers and streams
where it is now extirpated. Examples
include the Beaver River, Pennsylvania
(Ortmann 1920, p. 276); Ohio River,
Pennsylvania (Tolin 1987, p. 11);
Mahoning River, Pennsylvania
(Ortmann 1920 p. 276); Wabash River,
Indiana/Illinois (Cummings et al. 1992,
p. 46); Nolin River, Kentucky (Taylor
1983a, p. 111); and the South Fork
Holston River, Virginia/Tennessee
(Parmalee and Pohemus 2004, p. 234).
Significant declines of the longsolid
have been observed and documented in
the Ohio and Cumberland Rivers (Neel
and Allen 1964, p. 434, Haag and
Cicerello 2016, p. 139) and in the
Muskingum River system, which
harbors the last remaining populations
(Muskingum, Tuscarawas, and
Walhonding) in Ohio (Watters and
Dunn 1993–94, p. 252; Watters et al.
2009, p. 131).
Round Hickorynut
The current range of the round
hickorynut extends over nine States,
including Alabama, Indiana, Kentucky,
Michigan, Mississippi, Ohio,
Pennsylvania, Tennessee, and West
Virginia; the species is now considered
extirpated in Georgia, Illinois, and New
York. This range encompasses five
major river basins (Great Lakes, Ohio
River, Cumberland River, Tennessee
River, and Lower Mississippi River).
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Round hickorynut representation in the
Cumberland River basin is restricted to
two linear populations within two
management units, while it exists in the
Lower Mississippi River basin in a
single population. Therefore, while the
species currently maintains
representation from historical
conditions, it is at immediate risk of
losing 40 percent (2 of 5 basins) of its
representation due to these small,
isolated populations under a high
degree of threats from habitat loss and
water quality degradation.
Overall, the round hickorynut has lost
approximately 232 of 301 known
populations (77 percent), and 102 of 138
management units (74 percent). This
includes 25 populations in the Great
Lakes basin, 146 populations in the
Ohio River basin, 23 populations in the
Cumberland River basin, 29 populations
in the Tennessee River basin, and 9
populations in the Lower Mississippi
River basin (see appendix B in the SSA
report (Service 2019, pp. 191–212)). Of
the current populations, 4 (6 percent)
are estimated to be highly resilient, 16
(23 percent) are estimated to be
moderately resilient, and 49 (71 percent)
are estimated to have low resiliency.
The round hickorynut was once a
much more common, occasionally
abundant component of the mussel
assemblage in rivers and streams across
much of the eastern United States.
Population extirpations have been
extensive and widespread within every
major river basin where the round
hickorynut is found. Surveys
throughout eastern North America have
not targeted the round hickorynut
specifically, and as a result, there could
have been additional population losses
or declines that have gone
undocumented. Conversely, it is
possible that there are populations that
have gone undetected. However, the
majority of the species’ range has been
relatively well-surveyed for freshwater
mussel communities, and the likelihood
is low that substantial or stronghold
populations remain undetected. Patterns
of population extirpation and declines
are pronounced, particularly in the Ohio
River basin, which appears to be the
basin most important for redundancy
and representation for the species due to
its documented historical distribution
and remaining concentration of
populations within the basin.
Populations of the round hickorynut
have been lost from entire watersheds
and management units in which the
species once occupied multiple
tributaries, such as the Allegheny, Coal,
Little Scioto, Miami, and Vermilion
River management units in the Ohio
River basin. The State of Ohio, for
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example, has lost 49 populations of
round hickorynut, along with 17
management units (Watters et al. 2009,
p. 210). The species is also critically
imperiled in Canada, and as a result, the
future of the species in Canada may be
reliant on hatchery-supported activities
or augmentation activities coordinated
with the United States.
Precipitous declines and extirpations
of round hickorynut populations have
been documented in the Great Lakes,
Ohio, Cumberland, Tennessee, and
Lower Mississippi basins. Chronological
museum collections and published
literature accounts of the species
demonstrate that individuals were more
abundant in populations and there were
more populations across the range (see
appendix D in the SSA report (Service
2019, pp. 214–238)). While this
documentation could be a result of more
intensive survey effort in the core of the
species’ distribution, regardless, the
extirpation of formerly abundant and
extensive populations, has been most
pronounced in the Ohio and
Cumberland basins.
Examples of rivers where the round
hickorynut is extirpated within these
basins include: Crooked Creek,
Pennsylvania (Ortmann 1913, p. 298);
West Branch Mahoning River, Ohio
(Swart 1940, p. 42); Coal River, West
Virginia (Carnegie Museum and
University of Michigan Museum of
Zoology records); Olentangy River, Ohio
(Stein 1963, p. 109); Blaine Creek,
Kentucky (Bay and Winford 1984, p.
19); Embarras River, Illinois (Parmalee
1967, p. 80); Big Vermilion River,
Illinois (Parmalee 1967, p. 80);
Cumberland River, Kentucky (Neel and
Allen 1964, p. 442); Stones River,
Tennessee (Ohio State University
Museum records); and Red River,
Tennessee/Kentucky (Ohio State
University Museum records).
Threats Analysis
The following discussions include
evaluations of three threats and
associated sources that are affecting the
longsolid and round hickorynut and
their habitats: (1) Habitat degradation or
loss, (2) invasive and nonnative species,
and (3) negative effects associated with
small population size, including
potential cumulative or synergistic
effects (Service 2018 and 2019, chapter
6). We note that potential impacts
associated with overutilization were
evaluated, but we found no evidence of
current effects on the species’ viability
(noting historical effects from harvest on
the longsolid that no longer occur). In
addition, potential impacts from
disease, parasites, and predation, as
well as potential impacts to host
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species, were evaluated but were found
to have minimal effects on viability of
either species based on current
knowledge (Service 2018, pp. 70, 73–74;
Service 2019, pp. 91–95). Finally, we
also considered effects associated with
enigmatic population declines, which
have been documented in freshwater
river mussel populations since the
1960s; despite speculation and repeated
aquatic organism surveys and water
quality monitoring, the causes of these
events are unknown (Haag 2019, p. 43).
In some cases, the instream habitat often
remains basically intact and continues
to support other aquatic organisms such
as fish and crayfish. Full descriptions of
each of the threats and their sources,
including specific examples across the
species’ range where threats are
impacting the species or its habitat, are
available in chapter 6 and appendix A
of the SSA reports (Service 2018, pp.
43–76, 134–157; Service 2019, pp. 58–
96, 169–187).
We note that, by using the SSA
framework to guide our analysis of the
scientific information documented in
both the longsolid and round
hickorynut SSA reports, we have not
only analyzed individual effects on the
two species, but we have also analyzed
their potential cumulative effects. We
incorporate the cumulative effects into
our SSA analysis when we characterize
the current and future condition of the
species. To assess the current and future
condition of each of the species, we
undertake an iterative analysis that
encompasses and incorporates the
threats individually and then
accumulates and evaluates the effects of
all the relevant factors that may be
influencing the species, including
threats and conservation efforts.
Because the SSA framework considers
not just the presence of the factors, but
to what degree they collectively
influence risk to the entire species, our
assessment integrates the cumulative
effects of the factors and replaces a
standalone cumulative effects analysis.
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Habitat Degradation or Loss
Development/Urbanization
Development and urbanization
activities that may contribute to
longsolid and round hickorynut habitat
degradation and loss, including reduced
water quality, occur throughout the
species’ range. The term ‘‘development’’
refers to urbanization of the landscape,
including (but not limited to) land
conversion for residential, commercial,
and industrial uses and the
accompanying infrastructure. The
effects of urbanization may include
alterations to water quality, water
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quantity, and habitat (both in-stream
and streamside) (Ren et al. 2003, p. 649;
Wilson 2015, p. 424). Urban
development can lead to increased
variability in streamflow, typically
increasing the extent and volume of
water entering a stream after a storm
and decreasing the time it takes for the
water to travel over the land before
entering the stream (Giddings et al.
2009, p. 1). Deleterious effects on
streams (i.e., water collection on
impervious surfaces that rapidly flows
into storm drains and local streams),
including those that may be occupied by
the longsolid and round hickorynut
include:
(1) Water Quantity: Storm drains
deliver large volumes of water to
streams much faster than would
naturally occur, often resulting in
flooding and bank erosion that reshapes
the channel and causes substrate
instability, resulting in destabilization
of bottom sediments. Increased, highvelocity discharges can cause species
living in streams (including mussels) to
become stressed, displaced, or killed by
fast-moving water and the debris and
sediment carried in it. Displaced
individuals may be left stranded out of
the water once floodwaters recede.
(2) Water Quality: Pollutants (e.g.,
gasoline, oil drips, fertilizers) that
accumulate on impervious surfaces may
be washed directly into streams during
storm events. Contaminants contained
in point and non-point source
discharges degrade water and substrate
quality, and can result in reduced
survival, growth, and reproduction of
mussels.
(3) Water Temperature: During warm
weather, rain that falls on impervious
surfaces becomes superheated and can
stress or kill freshwater species when it
enters streams.
Other development-related impacts to
the longsolid and round hickorynut, or
their habitats, may occur as a result of:
• Water infrastructure. This includes
water supply, reclamation, and
wastewater treatment, which results in
pollution point discharges to streams.
Concentrations of contaminants
(including nitrogen, phosphorus,
chloride, insecticides, polycyclic
aromatic hydrocarbons, and personal
care products) increase with urban
development (Giddings et al. 2009, p. 2;
Bringolf et al. 2010, p. 1,311).
• Utility crossings and right-of-way
maintenance. Direct impacts from utility
crossings include direct exposure or
crushing of individuals, sedimentation,
and habitat disturbance. The greatest
cumulative impact involves cleared
rights-of-way that result in direct runoff
and increased stream temperature at the
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14803
crossing location, and potentially
promote maintenance utility and allterrain vehicle access from the rights-ofway (which destroys banks and
instream habitat, and thus can lead to
increased erosion (see also Service 2017,
pp. 48–49)).
• Anthropogenic activities. These
types of activities may act to lower
water tables, making the longsolid or
round hickorynut susceptible to
depressed flow levels. Water
infrastructure (see above) and water
withdrawals for irrigation, municipal,
and industrial water supplies are an
increasing concern due to expanding
human populations. It is currently
unknown whether anthropogenic effects
of development and urbanization are
likely to impact the longsolid or round
hickorynut at the individual or
population level. However, secondary
impacts such as the increased likelihood
of potential contaminant introduction,
stream disturbance caused by
impervious surfaces, barrier
construction, and forest conversion are
likely to act cumulatively on longsolid
and round hickorynut populations.
Agricultural activities are pervasive
across the range of the longsolid and
round hickorynut. Examples include
(but are not limited to):
• Longsolid: Agricultural erosion is
listed among the factors affecting the
Clinch and Powell Rivers (Ahlstedt et
al. 2016, p. 8).
• Longsolid: Sedimentation and other
non-point source pollution, primarily of
agricultural origin, are identified as a
primary threat to aquatic fauna of the
Nolichucky River (Tennessee Valley
Authority (TVA) 2006, p. 11).
• Longsolid: Agricultural impacts
have been noted to take a toll on mussel
fauna in the Goose Creek watershed of
the South Fork Kentucky River (Evans
2010, p. 15).
• Longsolid and round hickorynut:
The Elk River in Tennessee is a
watershed with significant agricultural
activity (Woodside et al. 2004, p. 10).
• Round hickorynut: Water
withdrawals for irrigation for
agricultural uses have increased
recently in the Tippecanoe River (Fisher
2019, pers. comm.).
• Round hickorynut: Sedimentation
and other point and non-point source
pollution, primarily of agricultural
origin, are identified as a primary threat
to aquatic fauna of Big Darby Creek and
Killbuck Creek, Ohio (Ohio Department
of the Environmental Protection Agency
2004, p. 1; Ohio Department of the
Environmental Protection Agency 2011,
p. 31).
• Round hickorynut: Approximately
25 percent of the land use area in the
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West Fork River management unit in
West Virginia is in agriculture,
increasing by as much as 9 percent as
most recently reported in 2010 (U.S.
Department of Agriculture 2010, p. 8).
• Round hickorynut: Large-scale
mechanized agricultural practices
threaten the last remaining population
in the Lower Mississippi River basin, in
the Big Black River, where the species
has already undergone range reduction
(Peacock and James 2002, p. 123).
• Round hickorynut: The Duck,
Buffalo, and Elk Rivers in Tennessee are
watersheds with significant agricultural
activity in their headwaters and
tributaries and are a suspected cause for
mussel community declines throughout
those rivers (Reed 2014, p. 4).
Transportation
Transportation-related impacts
include both road development and
river navigation. By its nature, road
development increases impervious
surfaces as well as land clearing and
habitat fragmentation. Roads are
generally associated with negative
effects on the biotic integrity of aquatic
ecosystems, including changes in
surface water temperatures and patterns
of runoff, changes in sedimentation
levels, and increased heavy metals
(especially lead), salts, organics, and
nutrients to stream systems (Trombulak
and Frissell 2000, p. 18). The adding of
salts through road de-icing results in
high salinity runoff, which is toxic to
freshwater mussels. In addition, a major
impact of road development is
improperly constructed culverts at
stream crossings, which can act as
barriers if flow through the culvert
varies significantly from the rest of the
stream, or if the culvert ends up
becoming perched (i.e., sitting above the
downstream streambed), and fishes that
serve as mussel hosts cannot pass
through them.
With regard to river navigation,
dredging and channelization activities
(as a means of maintaining waterways)
have altered riverine habitats
nationwide (Ebert 1993, p. 157).
Channelization affects many physical
characteristics of streams through
accelerated erosion, increased bed load,
reduced depth, decreased habitat
diversity, geomorphic instability, and
riparian canopy loss (Hartfield 1993, p.
139). All of these impacts contribute to
loss of habitat for the longsolid and
round hickorynut and alter habitats for
host fish. Changes in both the water
velocity and deposition of sediments
not only alters physical habitat, but the
associated increases in turbulence,
suspended sediment, and turbidity
affect mussel feeding and respiration
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(Aldridge et al. 1987, p. 25). The scope
of channel maintenance activities over
extensive areas alters physical habitat
and degrades water quality. In addition
to dredging and channel maintenance,
impacts associated with barge traffic,
which includes construction of fleeting
areas, mooring cells, docking facilities,
and propeller wash, also destroy and
disrupt mussel habitat (see Miller et al.
(1989, pp. 48–49) as an example for
disturbance from barges).
Transportation-related impacts across
the range of the longsolid and round
hickorynut include (but are not limited
to) the following examples:
• Channelization and dredging—
Longsolid populations in the Eel,
Vermilion, and Embarras Rivers and
Killbuck Creek are extirpated. Round
hickorynut populations in the
Vermilion and Embarras Rivers are
extirpated, while populations in the Eel
and Killbuck Creek management units
are in low condition; these streams have
been extensively dredged and
channelized (Butler 2007, p. 63;
Appendix B). Additionally, dredging for
barge traffic and navigation is identified
as the primary cause for suitable habitat
loss in the Kanawha River (below river
mile 79) in West Virginia (Taylor 1983b,
p. 3).
• Barge traffic, which includes
construction of fleeting areas, mooring
cells, docking facilities, and propeller
wash, destroys and disrupts mussel
habitat, currently affecting at least 15
(25 percent) of the longsolid
populations in the Ohio, Cumberland,
and Tennessee River basins (Hubbs et
al. 2006, p. 169; Hubbs 2012, p. 3; Smith
and Meyer 2010, p. 555; Sickel and
Burnett 2005, p. 7; Taylor 1983b, p. 5).
All six of the Ohio River mainstem
longsolid populations that are
considered in low condition are affected
by channel maintenance and navigation
operations; at least five (8 percent) of
the round hickorynut populations in the
Ohio basin are affected.
• Channel maintenance and
navigation are affecting the low
condition populations in the lower
Allegheny, Kanawha, and Tennessee
Rivers due to their clustered
distribution and proximity to locks and
dams. For the longsolid, these include
two Allegheny River populations below
Redbank, Pennsylvania (Smith and
Meyer 2010, p. 556); one population in
the Kanawha River, West Virginia; and
three low condition populations in the
Tennessee River main stem above
Kentucky Dam.
• Although most prevalent on the
mainstem Ohio and Tennessee Rivers,
commerce and commercial navigation
currently affect round hickorynut
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populations in the Black and
Muskingum Rivers.
Contaminants
Contaminants contained in point and
non-point discharges can degrade water
and substrate quality and adversely
impact mussel populations. Although
chemical spills and other point sources
of contaminants may directly result in
mussel mortality, widespread decreases
in density and diversity may result in
part from the subtle, pervasive effects of
chronic, low-level contamination
(Naimo 1995, p. 354). The effects of
heavy metals, ammonia, and other
contaminants on freshwater mussels
were reviewed by Mellinger (1972),
Fuller (1974), Havlik and Marking
(1987), Naimo (1995), Keller and Lydy
(1997), and Newton et al. (2003).
The effects of contaminants such as
metals, chlorine, and ammonia are
profound on juvenile mussels
(Augspurger et al. 2003, p. 2,571;
Bartsch et al. 2003, p. 2,566). Juvenile
mussels may readily ingest
contaminants adsorbed to sediment
particles while pedal feeding (Newton
and Cope 2007, p. 276). These
contaminants also affect mussel
glochidia, which are sensitive to some
toxicants (Goudreau et al. 1993, p. 221;
Jacobson et al. 1997, p. 2,386; Valenti et
al. 2005, p. 1,243).
Mussels are noticeably intolerant of
heavy metals (Havlik and Marking 1987,
p. 4). Even at low levels, certain heavy
metals may inhibit glochidial
attachment to fish hosts. Cadmium
appears to be the heavy metal most toxic
to mussels (Havlik and Marking 1987,
pp. 4–9), although chromium, copper,
mercury, and zinc also negatively affect
biological processes (Naimo 1995, p.
355; Jacobson et al. 1997, p. 2,389;
Valenti et al. 2005, p. 1,243). Chronic
mercury contamination from a chemical
plant on the North Fork Holston River,
Virginia, destroyed a diverse mussel
fauna downstream of Saltville, Virginia,
and potentially contributed to the
extirpation of the longsolid from that
river (Brown et al. 2005, p. 1,459). An
example of long-term declines and
extirpation of mussels attributed to
copper and zinc contamination
originating from wastewater discharges
at electric power plants includes the
Clinch River in Virginia (a portion of
which the longsolid currently occupies)
(Zipper et al. 2014, p. 9). This highlights
that, despite localized improvements,
these metals can stay bound in
sediments, affecting recruitment and
densities of the mussel fauna for
decades (Price et al. 2014, p. 12; Zipper
et al. 2014, p. 9).
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Examples of contaminant-related
impacts across the range of longsolid
and/or round hickorynut include (but
are not limited to):
• Contaminants have affected mussel
glochidia on the Clinch River, which is
a stronghold population for the
longsolid (Goudreau et al. 1993, p. 221;
Jacobson et al. 1997, p. 2,386; Valenti et
al. 2005, p. 1,243); round hickorynut is
now considered extirpated in the
Tennessee section of the river.
• The toxic effects of high salinity
wastewater from oil and natural gas
drilling on juvenile and adult freshwater
mussels were observed in the Allegheny
River, Pennsylvania, and in the Ohio
River basin (Patnode et al. 2015, p. 55).
• Numerous streams throughout both
species’ ranges have experienced mussel
and fish kills from toxic chemical spills,
such as Fish Creek in Indiana for the
round hickorynut (Sparks et al. 1999, p.
12), and the upper Tennessee River
system in Virginia for the longsolid
(Ahlstedt et al. 2016, p. 8; Neves 1987,
p. 9; Jones et al. 2001, p. 20; Schmerfeld
2006, p. 12). Also in the Tennessee
River basin, high counts of coliform
bacteria originating from wastewater
treatment plants have been documented,
contributing to degradation of water
quality being a primary threat to aquatic
fauna (Neves and Angermeier 1990, p.
50).
• Heavy metals and their toxicity to
mussels have been documented in the
Great Lakes and in the Clinton,
Muskingum, Ohio, Fox, Powell, Clinch,
and Tennessee Rivers where one or both
of these species occur (Havlik and
Marking 1987, pp. 4–9; van Hees et al.
2010, p. 606). Coal plants are also
located on the Kanawha, Green, and
Cumberland Rivers, and the effects of
these facilities on water quality and the
freshwater mussel fauna, including the
longsolid and round hickorynut, are
likely similar.
The degradation of water quality as a
result of land-based oil and gas drilling
activities has a significant adverse effect
on freshwater mussels, and specifically
on the longsolid in the Ohio River basin
and populations in the Allegheny River,
as well as the Kanawha, Little Kanawha,
and Elk Rivers (Entrekin et al. 2015, p.
2; Ecological Specialists, Inc. 2009, p.
27; Pond et al. 2008, p. 723; Patnode et
al. 2015, p. 55).
Agricultural Activities
The advent of intensive row crop
agricultural practices has been cited as
a potential factor in freshwater mussel
decline and species extirpation in the
eastern United States (Peacock et al.
2005, p. 550). Nutrient enrichment and
water withdrawals, which are threats
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commonly associated with agricultural
activities, are most likely to affect
individual longsolid and round
hickorynut mussels, although in some
instances may be localized and limited
in scope. However, chemical control
using pesticides, including herbicides,
fungicides, insecticides, and their
surfactants and adjuvants, are highly
toxic to juvenile and adult freshwater
mussels (Bringolf et al. 2007, p. 2,092).
Waste from confined animal feeding and
commercial livestock operations is
another potential source of
contaminants that comes from
agricultural runoff. The concentrations
of these contaminants that emanate from
fields or pastures may be at levels that
can affect an entire population,
especially given the highly fragmented
distributions of the longsolid and round
hickorynut (also see Contaminants,
above).
Agencies such as the U.S. Department
of Agriculture’s Natural Resources
Conservation Service and Soil and
Water Conservation Districts provide
technical and financial assistance to
farmers and private landowners.
Additionally, county resource
development councils and university
agricultural extension services
disseminate information on the
importance of minimizing land use
impacts, specifically agriculture, on
aquatic resources. These programs help
identify opportunities for conservation
through projects such as exclusion
fencing and alternate water supply
sources, which help decrease nutrient
inputs and water withdrawals, and help
keep livestock off of stream banks and
shorelines, thus reducing erosion.
However, the overall effectiveness of
these programs over a large scale is
unknown given the longsolid’s and
round hickorynut’s wide distribution
and varying agricultural intensities.
Given the large extent of private land
and agricultural activities within the
ranges of the longsolid and round
hickorynut, the effects of agricultural
activities that degrade water quality and
result in habitat deterioration (also see
Development/Urbanization, above) are
not frequently detected until after the
event(s) occur. In summary, agricultural
activities are pervasive across the ranges
of the longsolid and round hickorynut.
The effects of agricultural activities on
the longsolid and round hickorynut are
a factor in their historical decline and
localized extirpations.
Agricultural activities are pervasive
across the range of the longsolid and
round hickorynut. Specifically,
agricultural impacts have affected and
continue to affect high, medium, and
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low condition longsolid populations
within these basins, including:
• Longsolid only: French Creek and
Allegheny River (Pennsylvania), Hughes
River (West Virginia), Tuscawaras River
(Ohio), Rolling Fork River (Kentucky),
Little River and Valley River (North
Carolina), Nolichucky River
(Tennessee), Clinch and Powell Rivers
(Tennessee and Virginia), and Estill
Fork (Alabama).
• Round hickorynut only: South Fork
Hughes River (West Virginia), and Pine,
Belle, and Black Rivers (Michigan).
• Both species: Shenango River
(Pennsylvania); Middle Island Creek,
Elk, Little Kanawha, and North Fork
Hughes Rivers (West Virginia); Licking
and Kentucky Rivers (Kentucky); Elk
and Buffalo Rivers (Tennessee); and
Paint Rock River (Alabama).
Dams and Barriers
The effects of impoundments and
barriers on aquatic habitats and
freshwater mussels are relatively welldocumented (Watters 2000, p. 261).
Dams alter and disrupt connectivity,
and alter water quality, which affect
longsolid and round hickorynut species.
Extinction/extirpation of North
American freshwater mussels can be
traced to impoundment and inundation
of riffle habitats in all major river basins
of the central and eastern United States
(Haag 2009, p. 107). Humans have
constructed dams for a variety of
reasons: flood prevention, water storage,
electricity generation, irrigation,
recreation, and navigation (Eissa and
Zaki 2011, p. 253). Dams, either natural
(by beavers or by aggregations of woody
debris) or manmade, have many impacts
on stream ecosystems. Reductions in the
diversity and abundance of mussels are
primarily attributed to habitat shifts
caused by impoundments (Neves et al.
1997, p. 63). The survival of mussels
and their overall reproductive success
are influenced:
• Upstream of dams, by the change
from flowing to impounded waters,
increased depths, increased buildup of
sediments, decreased dissolved oxygen,
and the drastic alteration in resident
fish populations.
• Downstream of dams, by
fluctuations in flow regimes, minimal
releases and scouring flows, seasonal
depletion of dissolved oxygen, reduced
or increased water temperatures, and
changes in fish assemblages.
Additionally, improperly constructed
culverts at stream crossings may act as
barriers and have some similar negative
effects as dams on stream systems.
Fluctuating flows through the culvert
can vary significantly from the rest of
the stream, preventing fish passage and
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scouring downstream habitats. For
example, if a culvert sits above the
streambed, aquatic organisms cannot
pass through it. These barriers fragment
habitats along a stream course and
contribute to genetic isolation of the
aquatic species inhabiting the streams.
Whether constructed for purposes
such as flood control, navigation,
hydropower, water supply or multipurpose uses, the construction and
continued operation of dams (per
existing licensing schedules) is a
pervasive negative influence on the
longsolid, round hickorynut, and their
habitats throughout their ranges.
Although there are recent efforts to
remove older, failing dams within the
ranges of the longsolid and round
hickorynut, such as Lock and Dam 6 on
the Green River, and Six Mile Dam on
the Walhonding River, dams and their
effects on longsolid and round
hickorynut population distributions
have had perhaps the greatest
documented negative influence on these
species (Hardison and Layzer 2001, p.
79; Layzer et al. 1993, p. 68; Parmalee
and Polhemus 2004, p. 239; Smith and
Meyer 2010, p. 543; Hubbs 2012, p. 8;
Watters and Flaute 2010, p. 2).
Over 20 of the rivers and streams
currently occupied by the longsolid are
directly affected by dams, thus directly
influencing the species’ distribution
rangewide. For the round hickorynut,
all occupied rivers and streams are
directly or indirectly affected by dams.
See section 6.1.5 of the SSA reports for
specific areas where dams and other
impoundments occur within the range
of the species (Service 2018, pp. 59–63;
Service 2019, pp. 73–77).
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Changing Climate Conditions
Changing climate conditions that can
influence freshwater mussels include
increasing or decreasing water
temperatures and precipitation patterns
that result in increased flooding,
prolonged droughts, or reduced stream
flows, as well as changes in salinity
levels (Nobles and Zhang 2011, pp. 147–
148). An increase in the number of days
with heavy precipitation over the next
25 to 35 years is expected across the
longsolid’s range (U.S. Global Climate
Change Research Program 2017, p. 207).
Although changing climate conditions
have potentially affected the longsolid,
the timing, frequency, and extent of
these effects is currently unknown.
Possible impacts to the species could
include alteration of the fundamental
ecological processes, such as thermal
suitability; changes in seasonal patterns
of precipitation and runoff, which could
alter the hydrology of streams; and
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changes in the presence or combinations
of invasive, native or nonnative species.
We examined information on
anticipated climate effects to wideranging mussels, which included a
study that used representative
concentration pathways (RCPs) 2.6 and
8.5 and was conducted on the federally
endangered spectaclecase
(Cumberlandia monodonta). Our
analysis of the best available climate
change information revealed that within
the range of both the longsolid and
round hickorynut, shifts in the speciesspecific physiological thresholds in
response to altered precipitation
patterns and resulting thermal regimes
are possible. Additionally, the
expansion of invasive, nonnative
species because of climatic changes has
the potential for long-term detriments to
the mussels and their habitats. Other
potential impacts are associated with
changes in food web dynamics and the
genetic bottleneck that can occur with
low effective population sizes (Nobles
and Zhang 2011, p. 148). The influences
of these changes on the longsolid and
round hickorynut are possible in the
future (see Scenario 3 discussions under
Future Conditions, below). Multi-scale
climate models that can be interpreted
at both the rangewide and population
levels, and are tailored to benthic
invertebrates, which incorporate genetic
and life-history information, are needed
before the longsolid and round
hickorynut declines can be correlated
with climate change. At this time, the
best available information indicates that
climate change is considered a
secondary factor influencing the
viability of the longsolid and round
hickorynut and is not currently thought
to be a primary factor in the longsolid’s
or round hickorynut’s occurrence and
distribution across their ranges.
Resource Extraction
The most intensive resource
extraction activities affecting the
longsolid, round hickorynut, and their
habitats are coal mining and oil and gas
exploration, which are summarized
here. Additional less intensive resource
extraction activities affecting the species
include gravel mining/dredging, which
is detailed in the SSA reports (Service
2018, pp. 64–65; Service 2019, pp. 79–
83).
Activities associated with coal mining
and oil and gas drilling can contribute
chemical pollutants to streams. Acid
mine and saline drainage (AMD) is
created from the oxidation of ironsulfide minerals such as pyrite, forming
sulfuric acid (Sams and Beer 2000, p. 3).
This AMD may be associated with high
concentrations of aluminum,
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manganese, zinc, and other constituents
(Tennessee Department of Environment
and Conservation (TDEC) 2014, p. 72).
These metals, and the high acidity
typically associated with AMD, can be
acutely and chronically toxic to aquatic
life (Jones 1964, p. 96).
Natural gas extraction has negatively
affected water quality through
accidental spills and discharges, as well
as increased sedimentation due to
increases in impervious surface and tree
removal for drill pads and pipelines
(Vidic et al. 2013, p. 6). Disposal of
insufficiently treated brine wastewater
is known to adversely affect freshwater
mussels (Patnode et al. 2015, p. 62).
Contaminant spills are also a concern.
Unconsolidated sediment appears to
be the largest impact to mussel physical
habitat in streams as a result of gas
extraction activities (Entrekin et al.
2015, p. 23). Excessive suspended
sediments can impair feeding processes,
leading to acute short-term or chronic
long-term stress. Both excessive
sedimentation and excessive suspended
sediments can lead to reduced mussel
fitness (Ellis 1936, p. 29; Anderson and
Kreeger 2010, p. 2). This sediment is
generated by construction of the well
pads, access roads, and pipelines (for
both gas and water).
Examples of the variety of resource
extraction activities (coal, oil, gas, and
gravel mining) that occur across the
range of the longsolid and round
hickorynut include (but are not limited
to):
• Longsolid: The Cumberland Plateau
and Central Appalachian regions of
Tennessee and Kentucky (upper
Cumberland River system and upper
Tennessee River system) continue to
experience mining activity that impairs
water quality in streams (TDEC 2014, p.
62).
• Longsolid: High levels of copper,
manganese, and zinc, metals toxic to
freshwater mussels, were found in
sediment samples from both the Clinch
and Powell Rivers, and mining impacts
close to Big Stone Gap, Virginia, have
almost eliminated the mussel fauna in
the upper Powell River. The longsolid is
considered extirpated from the South
Fork Powell River and Cane Creek, both
tributaries to the upper portion of the
Powell River (Ahlstedt and Tuberville
1997, p. 75; appendix D in the SSA
report).
• Round hickorynut: Although
populations persist in the Rockcastle
River and Buck Creek in the
Cumberland basin, coal and gravel
mining continue to occur in these
watersheds.
• Round hickorynut: The extensive
mining of gravel in riparian zones
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reduces vegetative buffers and causes
channel instability and has been
implicated in mussel declines in the
Walhonding River, Ohio, which harbors
a low condition population (Hoggarth
1995–96, p. 150).
• Round hickorynut: The West Fork
River in West Virginia has oil and gas
activity within the watershed, as well as
legacy mining issues, which have
resulted in biological impairment
throughout the drainage (West Virginia
Department of Environmental Protection
2014, pp. 23–29).
• Both species: Impacts from natural
gas pipelines have a high potential to
occur in West Virginia and
Pennsylvania. Tank trucks hauling such
fluids can overturn into mussel streams,
which has occurred in Meathouse Fork
of Middle Island Creek (Clayton 2018,
pers. comm.).
• Both species: Natural gas extraction
in the Marcellus Shale region (the
largest natural gas field in the United
States that runs through northern
Appalachia) has negatively affected
water quality through accidental spills
and discharges in populations in the
Shenango, Elk, Little Kanawha, and
Kanawha management units.
• Both species: Coal mining has been
implicated in sediment and water
chemistry impacts in the Kanawha River
in West Virginia, potentially limiting
the Kanawha River populations of both
species (Morris and Taylor 1978, p.
153).
• Both species: Resource extraction
and AMD have been cited as
contributors to the loss of mussel
species in the Cumberland basin (Haag
and Cicerello 2016, p. 15), including the
loss of longsolid from Rockcastle and
Caney Fork Rivers, and the loss of round
hickorynut in the Caney Fork, Little
South Fork, Big South Fork, and
Cumberland Rivers (Anderson et al.
1991, p. 6; Layzer and Anderson 1992,
p. 97; Warren and Haag 2005, p. 1,383).
• Both species: In the upper Kentucky
River watershed, where both species
exhibit a lack of recruitment (and also
in the Red River for round hickorynut),
historical un-reclaimed mines and
active coal mines are prevalent
(Kentucky Department for
Environmental Protection 2015, p. 66).
Forest Conversion
Clearing large areas of forested
wetlands and riparian systems
eliminates shade once provided by tree
canopies, exposing streams to more
sunlight and increasing the in-stream
water temperature (Wenger 1999, p. 35).
The increase in stream temperature and
light after deforestation alters
macroinvertebrate (and other aquatic
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species) richness, abundance, and
composition in streams to various
degrees depending on a species’
tolerance to temperature changes and
increased light in the aquatic system
(Kishi et al. 2004, p. 283; Couceiro et al.
2007, p. 272; Caldwell et al. 2014, p.
2,196).
Sediment runoff from clearing
forested areas is a known stressor to
aquatic systems (e.g., Webster et al.
1992, p. 232; Jones III et al. 1999, p.
1,455; Broadmeadow and Nisbet 2004,
p. 286; Aust et al. 2011, p. 123). The
physical characteristics of stream
channels are affected when large
quantities of sediment are added or
removed (Watters 2000, p. 263). Mussels
and fishes are potentially affected by
changes in suspended and bed material
load, changes in bed sediment
composition associated with increased
sediment production and runoff,
changes in channel formation, stream
crossings, and inadequately buffered
clear-cut areas, all of which can be
sources of sediment entering streams
(Taylor et al. 1999, p. 13).
Forest conversion to other land uses
such as agriculture and urban
development has occurred across the
range of the longsolid and round
hickorynut. Siltation and erosion from
forest conversion to other land use
activities without BMPs is a welldocumented stressor to aquatic systems
throughout the eastern United States,
and can have an impact depending on
the physical, chemical, and biological
characteristics of adjacent streams
(Allan and Castillo 2007, p. 107). Forest
conversion has been documented in all
basins in which these species occur.
Also, some forestry practices have the
potential to result in increased siltation
in riparian systems through the cycle of
forest thinning, final harvest, site
preparation, and re-planting activities.
However, implementation of BMPs and
establishment of SMZs can minimize
these impacts (Service 2018 and 2019,
chapter 6); adherence to these BMPs and
SMZs broadly protects water quality,
particularly related to sedimentation (as
reviewed by Cristan et al. 2016, entire;
Warrington et al. 2017, entire; and
Schilling et al. 2021, entire).
Invasive and Nonnative Species
When a nonnative species is
introduced into an ecosystem, it may
have many advantages over native
species, such as easy adaptation to
varying environments and a high
tolerance of living conditions that allow
it to thrive in its new habitat. There may
not be natural predators to keep the
nonnative species in check; therefore, it
can potentially live longer and
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reproduce more often, further reducing
the biodiversity in the system. The
native species may become an easy food
source for invasive, nonnative species,
or the invasive species may carry
diseases that extirpate populations of
native species. Invasive, nonnative
species are pervasive across the
longsolid’s and round hickorynut’s
ranges. Examples of invasive, nonnative
species that affect freshwater mussels
like the longsolid and round hickorynut
are the Asian clam (Corbicula fluminea),
zebra mussel (Dreissena polymorpha),
quagga mussel (Dreissena bugensis),
black carp (Mylopharyngodon piceus),
didymo (also known as rock snot;
Didymosphenia geminata), and hydrilla
(also known as water-thyme; Hydrilla
verticillata).
• The Asian clam alters benthic
substrates, may filter mussel sperm or
glochidia, competes with native species
for limited resources, and causes
ammonia spikes in surrounding water
when they die off en masse (Scheller
1997, p. 2).
• Dreissenid mollusks, such as the
zebra mussel and quagga mussel,
adversely affect native species through
direct colonization, reduction of
available habitat, changes in the biotic
environment, or a reduction in food
sources (MacIsaac 1996, p. 292). Zebra
mussels are also known to alter the
nutrient cycle in aquatic habitats,
affecting other mollusks and fish species
(Strayer 1999, p. 22).
• Given their size and diet
preferences, black carp have the
potential to restructure benthic
communities. Mussel beds consisting of
smaller individuals and juvenile
recruits are probably most vulnerable to
being consumed by black carp (Nico et
al. 2005, p. 192). Furthermore, because
black carp attain a large size (well over
3.28-ft (1-m) long), and their life span is
reportedly over 15 years, they are
expected to persist for many years.
Therefore, they have the potential to
cause harm to native mollusks by way
of predation on multiple age classes
(Nico et al. 2005, p. 77).
• The two nonnative plant species
that are most problematic for the
longsolid and round hickorynut (i.e.,
impacting the species throughout their
ranges) are hydrilla and didymo.
Hydrilla is an aquatic plant that alters
stream habitat, decreases flows, and
contributes to sediment buildup in
streams (National Invasive Species
Council Management Plan 2018, p. 2).
High sedimentation can cause
suffocation, reduce stream flow, and
make it difficult for mussels’
interactions with host fish necessary for
development. Didymo can alter the
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habitat and change the flow dynamics of
a site (Jackson et al. 2016, p. 970).
Invasive plants grow uncontrolled and
can smother habitat, affect flow
dynamics, alter water chemistry, and
increase water temperatures, especially
in drought conditions (Colle et al. 1987,
p. 416).
• Specifically for the round
hickorynut, the nonnative round goby
can out-compete native benthic fishes
(such as darters and sculpin) for food
and other resources, and may also prey
especially heavily on juvenile native
mussels, such as round hickorynut
(Bradshaw-Wilson et al. 2019, p. 268)
Effects Associated With Small
Population Size
Without the level of population
connectedness that the species
experienced historically (i.e., without
barriers such as reservoirs), small,
isolated populations that may now be
comprised predominantly of adult
individuals could be slowly dying out.
Even given the very improbable absence
of other anthropogenic threats, these
disjunct populations could be lost
simply due to the consequences of
below-threshold effective population
sizes. Because only 60 primarily
disjunct streams among 160 historically
occupied areas continue to harbor
populations of the longsolid, and 69
primarily disjunct streams of 301
historically occupied areas continue to
harbor populations of the round
hickorynut, this is likely partial
testimony to the principle of effective
population size and its role in
population loss.
The longsolid and round hickorynut
exhibit several traits that influence
population viability, including
relatively small population size and low
fecundity at many locations compared
to other mussels (see appendix A in
Service 2018 and 2019). Small
population size puts the species at
greater risk of extirpation from
stochastic events (e.g., drought) or
anthropomorphic changes and
management activities that affect
habitat. In addition, small longsolid or
round hickorynut populations may have
reduced genetic diversity, be less
genetically fit, and be more susceptible
to disease during extreme
environmental conditions compared to
large populations (Frankham 1996, p.
1,505).
Genetic drift occurs in all species, but
the lack of drift is more likely to
negatively affect populations that have a
smaller effective population size
(number of breeding individuals) and
populations that are geographically
spread out and isolated from one
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another. Relatively low fecundity,
commonly observed in species of
Fusconaia, is another inherent factor
that could influence population
viability (Geist 2010, p. 91). Survival of
juveniles in the wild is already low, and
females produce fewer offspring than
other mussel species (Haag and Staton
2003, p. 2,125). Factors such as low
effective population size, genetic
isolation, relatively low levels of
fecundity and recruitment, and limited
juvenile survival could all affect the
ability of these species to maintain
current population levels and to
rebound if a reduction in population
occurs (e.g., through predation, toxic
releases or spills, or poor environmental
conditions that inhibit successful
reproduction). Additionally, based on
our presumption of fish hosts of the
longsolid and the known species of fish
hosts for the round hickorynut, they are
small-bodied fishes that have
comparatively limited movement
(Vaughn 2012, p. 6); therefore, natural
expansion of longsolid and round
hickorynut populations is limited.
Dendritic (branched) streams and
rivers are highly susceptible to
fragmentation and may result in
multiple habitat fragments and isolated
populations of variable size (Fagan
2002, p. 3,247). In contrast to
landscapes where multiple routes of
movement among patches are possible,
pollution or other habitat degradation at
specific points in dendritic landscapes
can completely isolate portions of the
system (Fagan 2002, p. 3,246).
Future Conditions
In the SSA reports, we forecast the
longsolid’s and round hickorynut’s
response to plausible future scenarios of
environmental conditions and
conservation efforts. The future
scenarios project the threats into the
future and consider the impacts those
threats could have on the viability of the
longsolid and round hickorynut. We
apply the concepts of resiliency,
redundancy, and representation to the
future scenarios to describe possible
future conditions of the longsolid and
round hickorynut. The scenarios
described in the SSA reports represent
only three possible future conditions for
each of the species. Uncertainty is
inherent in any risk assessment, so we
must consider plausible conditions to
make our determinations. Viability is
not a specific state, but rather a
continuous measure of the likelihood
that the species will sustain populations
over time.
In the SSA reports, we considered
three future scenarios. Scenario 1
assesses the species’ response to factors
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influencing current longsolid and round
hickorynut populations and
management units, assuming the current
level of impacts remains constant into
the future. Scenario 2 assesses the
species’ response when factors that
negatively influence most of the extant
populations and management units are
reduced by additional conservation.
Scenario 3 assesses the species’
response to worsening conditions of the
factors that most influence the species
due to the implementation of known
existing and projected development,
resource extraction, hydroelectric
projects, etc. An important assumption
of the predictive analysis presented
herein is that future population
resiliency for each species is largely
dependent on water quality, water flow,
instream habitat conditions, and
condition of riparian vegetation (see
Species Needs, above).
The future conditions timeframe for
our analysis is different for each species.
A timeframe of 50 to 70 years into the
future is evaluated for the longsolid, and
20 to 30 years into the future is
evaluated for the round hickorynut. We
selected these timeframes based on the
availability of trends and threat
information, planning documents, and
climate modeling that could be reliably
projected into the future, and also the
consideration of at least two generations
for each species (i.e., 25 to 35 years for
the long-lived longsolid, and on average
12–13 years (Shepard 2006, p. 7; Ehlo
and Layzer 2014, p. 11) for the round
hickorynut).
Longsolid
Our assessment predicts that if
conditions remain the same or worsen
into the future, all 60 populations
would experience negative changes to
the species’ important habitat requisites
(see Species Needs, above), including
the loss of the single remaining
population in the Cumberland River
basin, and potentially resulting in no
highly resilient populations (Scenario
3). Alternatively, the scenario that
incorporates additive conservation
measures beyond those currently
implemented (Scenario 2) could result
in the continued persistence of all 60
populations in the future. However, we
note that approximately 30 of 60 (50
percent) of these are currently low
condition populations, based on either
surveys that pre-date 2000 or on the
collection of only five or fewer older,
non-reproducing individuals. Some of
these populations may already be
extirpated. The risks facing the
longsolid populations varied among
scenarios and are summarized below
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(see table 8–1 and table ES–1 in the SSA
report).
Under Scenario 1, lowered resiliency,
representation, and redundancy are
expected. Under this scenario, we
predict that 1 population of the current
3 high condition populations would
remain in high condition, 6 populations
(10 percent) in medium condition, and
15 populations (25 percent) in low
condition. Redundancy would be
reduced with likely extirpation of 38 out
of 60 (63 percent) currently extant
populations; only the Ohio River basin
(one of the three basins currently
occupied by the species) would retain
one highly resilient population (i.e., the
Green River population in the Upper
Green management unit).
Representation would be reduced, with
two of the three currently occupied river
basins continuing to harbor longsolid
populations.
Under Scenario 2, we predict higher
levels of resiliency in some areas of the
longsolid’s range than was estimated for
Scenario 1; representation and
redundancy would remain the same
level as current conditions, with the
species continuing to occur within all
currently occupied management units
and States across its range. Seven
populations (12 percent) are predicted
to be in high condition, compared to the
current four populations in high
condition. Scenario 2 also predicts 20
populations (33 percent) in medium
condition and 33 populations (52
percent) in low condition; no
populations would become extirpated.
All three currently occupied major river
basins would remain occupied, and the
existing levels of redundancy and
representation would improve. It is
possible that this scenario is the least
likely to occur in the future as compared
to Scenario 1 or 3 only because it will
take many years (potentially beyond the
50- to 70-year timeframe analyzed in the
SSA report) for all of the beneficial
effects of management actions that are
necessary to be implemented and
realized on the landscape.
Under Scenario 3, we predict a
significant decrease in resiliency,
representation, and redundancy across
the species’ range. Redundancy would
be reduced from three major river basins
to two basins with no high condition
populations remaining, and the likely
extirpation of 44 (73 percent) of the
currently extant populations. The
resiliency of the remaining 16
populations is expected to be reduced to
3 populations (5 percent) in medium
condition and 13 (22 percent) in low
condition. In addition to the loss of 44
populations, 32 (29 percent) of the
management units are predicted to
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become extirpated. Representation
would be reduced to 13 management
units, 2 major river basins, and 3 States
(as compared to the current 9 States)
occupied by the species.
Round Hickorynut
Our assessment predicts that if
conditions remain the same (Scenario
1), 44 of 69 populations (62 percent)
would experience negative changes to
the important habitat requisites,
including the potential loss of 23
populations. This includes the
predicted extirpation of the two
populations in the Cumberland River
basin and the population in the Lower
Mississippi River basin. Additionally,
under Scenario 3, no highly resilient
populations are able to persist, and 90
percent of remaining populations are in
low condition. Alternatively, the
scenario that includes additive
conservation measures beyond those
currently implemented (Scenario 2)
could result in the continued
persistence of all 69 populations in the
future. However, approximately 49 of 69
(71 percent) of these populations are
currently in low condition. Many of the
known populations of the round
hickorynut have been collected as 10 or
fewer individuals, with limited extent
information available, due to the lack of
survey effort targeting the species
(Service 2019, appendix A). The risks
facing round hickorynut populations
varied among scenarios and are
summarized below (see also table 8–1
and table ES–1 in the SSA report).
Under Scenario 1, lowered resiliency,
representation, and redundancy are
expected. We predict that only one of
the current four high condition
populations would remain in high
condition. Under this scenario, only the
Great Lakes basin (one of the five basins
currently occupied by the species)
would retain a highly resilient
population (i.e., the Grand River). Of the
69 extant populations, 14 (20 percent)
would be in medium condition and 31
(45 percent) would be in low condition.
We estimate extirpation of 23 out of 69
(33 percent) populations. Redundancy
would decline due to these population
and management unit losses, resulting
in a loss of the species from
Pennsylvania and Mississippi.
Representation would be reduced
through extirpation of populations and
management units in the Cumberland
and Great Lakes basins, a 40 percent
loss of redundancy compared to current
conditions. Under this scenario, only
three of the five currently occupied river
basins (Great Lakes, Ohio, and
Tennessee) continue to harbor round
hickorynut populations.
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Under Scenario 2, we predict higher
levels of resiliency in some areas of the
round hickorynut’s range than is
estimated for Scenario 1; representation
and redundancy would remain the same
level as current conditions with the
species continuing to occur within all
currently occupied management units
and States across the species’ 9-State
range. Up to 15 populations (23 percent)
are predicted to be high condition
compared to the current 4 populations
in high condition. Scenario 2 also
predicts 39 populations (56 percent) in
medium condition and 15 populations
(22 percent) in low condition. All
currently occupied major river basins
would remain occupied, and the
existing levels of redundancy and
representation would improve. There
are sufficient population sizes within
each basin to facilitate augmentation
and restoration efforts, whether it be
within-basin translocations or captive
propagation techniques. It is possible
that this scenario is the least likely to
occur in the future as compared to
Scenario 1 or 3. This is because it will
take many years (potentially beyond the
20- to 30-year time frame analyzed in
the SSA report) for all of the beneficial
effects of management actions that are
necessary to be implemented on the
landscape to be realized.
Under Scenario 3, we predict a
significant decrease in resiliency,
representation, and redundancy across
the species’ range. Redundancy would
be reduced from five major river basins
to three basins, with extirpations
expected to occur in the Cumberland
and Lower Mississippi River basins. No
high condition populations would
remain, and 49 (71 percent) of the 69
extant populations are likely to become
extirpated. The resiliency of the
remaining 20 populations is expected to
be reduced to 2 populations (10 percent)
in medium condition and 18 (90
percent) in low condition. In addition to
the potential loss of 49 populations, 23
(68 percent) of the currently extant 36
management units are predicted to no
longer harbor the species.
Representation could be reduced to 14
management units across 3 major river
basins. Extirpations are expected from
the States of Pennsylvania, Michigan,
and Mississippi, leaving 6 States (as
compared to the current 9, and
historically 12) occupied by the species.
Determination of Status for the
Longsolid and Round Hickorynut
Introduction
Section 4 of the Act (16 U.S.C. 1533)
and its implementing regulations (50
CFR part 424) set forth the procedures
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for determining whether a species meets
the definition of an endangered species
or a threatened species. The Act defines
an ‘‘endangered species’’ as a species in
danger of extinction throughout all or a
significant portion of its range, and a
‘‘threatened species’’ as a species likely
to become an endangered species within
the foreseeable future throughout all or
a significant portion of its range. The
Act requires that we determine whether
a species meets the definition of
endangered species or threatened
species because of any of the following
factors: (A) The present or threatened
destruction, modification, or
curtailment of its habitat or range; (B)
Overutilization for commercial,
recreational, scientific, or educational
purposes; (C) Disease or predation; (D)
The inadequacy of existing regulatory
mechanisms; or (E) Other natural or
manmade factors affecting its continued
existence.
In conducting our status assessment
of the longsolid and round hickorynut,
we evaluated all identified threats under
the Act’s section 4(a)(1) factors and
assessed how the cumulative impact of
all threats acts on the viability of the
species as a whole. That is, all the
anticipated effects from both habitatbased and direct mortality-based threats
are examined in total and then
evaluated in the context of what those
combined negative effects will mean to
the current and future condition of the
longsolid and round hickorynut.
However, for the vast majority of
potential threats, the effect on the
longsolid and round hickorynut (e.g.,
total losses of individual mussels or
their habitat) cannot be quantified with
available information. Instead, we use
the best available information to gauge
the magnitude of each individual threat
on the longsolid and round hickorynut,
and then assess how those effects
combined (and as may be ameliorated
by any existing regulatory mechanisms
or conservation efforts) will impact the
longsolid’s or round hickorynut’s
current and future viability.
Longsolid—Status Throughout All of Its
Range
After evaluating threats to the species
and assessing the cumulative effect of
the threats under the section 4(a)(1)
factors, we determined that the species’
distribution and abundance has been
reduced across its range as
demonstrated by both the number of
occupied management units and the
number of populations where it
historically occurred. Historically, the
species occurred within 160
populations and 105 management units
across 12 States; currently, the species
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occurs in 60 populations and 45
management units across 9 States,
which represents a 62 percent reduction
of its historically occupied populations
(although we note that the remaining
populations are well-distributed as
opposed to concentrated within its
range). The conditions of the remaining
60 extant populations vary between
being highly resilient, moderately
resilient, or having low resiliency (see
Current Conditions, above, and section
5.2 in the SSA report (Service 2018, pp.
34–37)).
Currently, 3 populations (5 percent)
are highly resilient, 8 (13 percent) are
moderately resilient, and 49 (71 percent)
have low resiliency. Although
downward trends are evident compared
to historical information, 11 highly to
moderately resilient populations are
present within three of the four major
river basins the species is historically
known to occupy. Current and ongoing
threats from habitat degradation or loss
(Factor A), residual impacts from past
harvest and overutilization (Factor B),
and invasive, nonnative species (Factor
E) contribute to the species’ negative
effects associated with small population
size (Factor E). The continued
occupancy of these 11 populations (in
addition to some survey information)
implies that recent recruitment is
occurring in some populations to help
maintain a level of resiliency,
redundancy, and representation. Thus,
after assessing the best available
information, we conclude that the
longsolid is not currently in danger of
extinction throughout all of its range.
Therefore, we proceed with determining
whether the longsolid is likely to
become an endangered species within
the foreseeable future throughout all of
its range.
At this point in time, and as noted
above, the threats currently acting on
the species include habitat degradation
or loss from a variety of sources and
invasive, nonnative species, all of which
contribute to the negative effects
associated with the species’ small
population size. Our analysis revealed
that these threats are likely to continue
into the foreseeable future, or
approximately 50 to 70 years. This
timeframe accounts for reasonable
predictions of threats continuing into
the future based on our examination of
empirical data available over the last 30
years (e.g., survey data, how threats are
manifesting themselves on the
landscape and the species,
implementation of management plans
and voluntary conservation actions),
and also takes into consideration the
biology of the species (multiple
generations of a long-lived species) and
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the licensing schedules of dams within
the species’ range.
The best available information,
including our consideration of
comments we received on the
September 29, 2020 (85 FR 61384),
proposed rule, indicates that the threats
currently acting upon the longsolid are
expected to continue into the
foreseeable future, some of which (e.g.,
water quality and habitat degradation,
and invasive, nonnative species) are
reasonably expected to worsen over
time, including concurrent with
increasing human population trends
that further reduce the species’
resiliency, redundancy, and
representation across its range. Our
analysis reveals the potential for either
none or a single population (i.e., the
Green River in Kentucky) to persist as
highly resilient (i.e., continued
reproduction with varied age classes
present) in the foreseeable future,
assuming threats remain or worsen on
the landscape. Additionally, the
majority of the remaining populations
would exhibit low resiliency, while
many (between 30 and 73 percent of the
current low condition populations)
would potentially become extinct or
functionally extinct (e.g., significant
habitat degradation; no reproduction
due to highly isolated, non-recruiting
individuals). Our future analysis also
reveals a high risk that the species
would become extirpated in one of the
four historically occupied river basins
(i.e., Cumberland River basin); it has
already been lost from the Great Lakes
basin. Thus, after assessing the best
available information, we conclude that
the longsolid is not currently in danger
of extinction but is likely to become in
danger of extinction within the
foreseeable future throughout all of its
range.
Longsolid—Status Throughout a
Significant Portion of Its Range
Under the Act and our implementing
regulations, a species may warrant
listing if it is in danger of extinction or
likely to become so in the foreseeable
future throughout all or a significant
portion of its range. The court in Center
for Biological Diversity v. Everson, 435
F. Supp. 3d 69 (D.D.C. 2020) (Everson),
vacated the aspect of the Final Policy on
Interpretation of the Phrase ‘‘Significant
Portion of Its Range’’ in the Endangered
Species Act’s Definitions of
‘‘Endangered Species’’ and ‘‘Threatened
Species’’ (Final Policy; 79 FR 37578;
July 1, 2014) that provided that the
Service does not undertake an analysis
of significant portions of a species’
range if the species warrants listing as
threatened throughout all of its range.
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Therefore, we proceed to evaluating
whether the species is endangered in a
significant portion of its range—that is,
whether there is any portion of the
species’ range for which both (1) the
portion is significant; and (2) the species
is in danger of extinction in that
portion. Depending on the case, it might
be more efficient for us to address the
‘‘significance’’ question or the ‘‘status’’
question first. We can choose to address
either question first. Regardless of
which question we address first, if we
reach a negative answer with respect to
the first question that we address, we do
not need to evaluate the other question
for that portion of the species’ range.
Following the court’s holding in
Everson, we now consider whether there
are any significant portions of the
species’ range where the species is in
danger of extinction now (i.e.,
endangered). In undertaking this
analysis for the longsolid, we choose to
address the status question first—we
consider information pertaining to the
geographic distribution of both the
species and the threats that the species
faces to identify portions of the range
where the species may be in danger of
extinction.
We evaluated the range of the
longsolid to determine if the species is
in danger of extinction now in any
portion of its range. The range of a
species can theoretically be divided into
portions in an infinite number of ways.
We examined the species entire range in
an attempt to focus this analysis on
portions of the species’ range that may
meet the definition of an endangered
species. For the longsolid, we
considered whether the threats or their
effects on the species are greater in any
biologically meaningful portion of the
species’ range than in other portions
such that the species is in danger of
extinction now in that portion.
The statutory difference between an
endangered species and a threatened
species is the timeframe in which the
species becomes in danger of extinction;
an endangered species is in danger of
extinction now while a threatened
species is not in danger of extinction
now but is likely to become so in the
foreseeable future. Thus, we considered
the time horizon for the threats that are
driving the longsolid to warrant listing
as a threatened species throughout all of
its range. We then considered whether
these threats or their effects are
occurring in any portion of the species’
range such that the species is in danger
of extinction now in that portion of its
range. We examined the following
threats: habitat degradation or loss;
invasive, nonnative species; effects
associated with small population size;
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and the potential for cumulative effects.
We also considered whether these
threats may be exacerbated by small
population size (or low condition).
Overall, we found that threats are likely
acting on individuals or populations, or
even basins, similarly across the
species’ range. These threats are certain
to occur, and in those basins with few
populations that are predominantly in
low condition, these populations are
facing the same threats, and these
threats can be of greater magnitude in
some areas or of greater impact, given
small population sizes.
One basin—the Cumberland River—
has been reduced by 91 percent with
one remaining low condition
population. Although there are low
condition populations in all three basins
in which the species occurs, because
this basin has seen its populations
significantly reduced to a single
population currently in low condition,
this circumstance—in combination with
the other threats acting on the species
throughout its range—may indicate that
the species may be in danger of
extinction now in this portion of the
range.
Small, isolated populations often
exhibit reduced levels of genetic
variability, which diminishes the
species’ capacity to adapt and respond
to environmental changes, thereby
decreasing the probability of long-term
persistence. Small populations may
experience reduced reproductive vigor,
for example, due to inbreeding
depression. Isolated individuals may
have difficulty reproducing. The
problems associated with small
population size and vulnerability to
random demographic fluctuations or
natural catastrophes are further
magnified by synergistic interactions
with other threats, such as those
discussed above. Based on our review of
information and the synergistic effects
of threats exacerbated by a single lowcondition population in the Cumberland
River basin, we find that this basin is a
portion of the longsolid’s range with a
potential difference in biological
condition.
Because we have determined the
Cumberland River basin is a portion of
the range that may be in danger of
extinction now, we next evaluate
whether this portion may be significant.
We first examined this area’s
contribution to the resiliency,
redundancy, and representation of the
species. We determined that this basin
contains 1 of 60 populations (1.7
percent) identified in the SSA report.
Therefore, this single population does
not contribute significantly, either
currently or in the foreseeable future, to
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the species’ total resiliency at a
biologically meaningful scale compared
to other representative areas. The
overall representation described herein
would likely be the same under two of
the three scenarios. We conclude that
the Cumberland River basin population
does not contribute meaningfully to the
species’ viability overall. We evaluated
the best available information for the
Cumberland River basin in this context,
assessing its significance in terms of
these conservation concepts and
determined that this single portion is
not biologically significant to the
species.
The single population in the
Cumberland River basin does not act as
a refugia for the species or as an
important spawning ground. In
addition, the water quality is similar
throughout the species’ range with
impaired water quality occurring in all
three basins. Since the longsolid occurs
in similar aquatic habitats across its
range, the Cumberland River basin
portion provides similar habitat
characteristics as the remainder of the
range. Therefore, there are no unique
habitat characteristics attributable to
just the Cumberland River basin portion
of the range, and this portion serves a
similar role in supporting the species’
viability as compared to the rest of the
range.
Overall, and in summary, we found
one portion of the longsolid’s range, the
Cumberland River basin, that may have
a different status as compared to the
remaining portion of the longsolid’s
range. We found the Cumberland River
basin was not a biologically meaningful
portion of the longsolid’s range; in other
words, we found it was not significant
in terms of its overall contribution to the
species’ resiliency, redundancy, and
representation, nor was it found to be
significant in terms of high-quality
habitat or habitat that is otherwise
important for the species’ life history.
As a result, while Cumberland River
basin may have a different status, we
determined it is not a significant portion
of the range. Accordingly, no portion of
the longsolid’s range provides a basis for
determining that the species is in danger
of extinction in a significant portion of
its range, and we determine that the
species is likely to become in danger of
extinction within the foreseeable future
throughout all of its range. This does not
conflict with the courts’ holdings in
Desert Survivors v. U.S. Department of
the Interior, 321 F. Supp. 3d 1011,
1070–74 (N.D. Cal. 2018) and Center for
Biological Diversity v. Jewell, 248 F.
Supp. 3d 946, 959 (D. Ariz. 2017)
because, in reaching this conclusion, we
did not apply the aspects of the Final
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Policy, including the definition of
‘‘significant’’ that those court decisions
held to be invalid.
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Longsolid—Determination of Status
Our review of the best available
scientific and commercial information
indicates that the longsolid meets the
definition of a threatened species.
Therefore, we are listing the longsolid as
a threatened species in accordance with
sections 3(20) and 4(a)(1) of the Act.
Round Hickorynut—Status Throughout
All of Its Range
After evaluating threats to the species
and assessing the cumulative effect of
the threats under the Act’s section
4(a)(1) factors, we determined that the
round hickorynut’s abundance has been
reduced across its range as
demonstrated by both number of
occupied management units and the
number of populations where the
species has historically occurred.
Historically, the species occurred within
301 populations and 138 management
units across 12 States (plus at least 10
populations and 8 management units
within the Canadian Province of
Ontario); currently, the species occurs
in 69 populations and 36 management
units across 9 States, which represents
a 77 percent reduction of its historically
occupied populations (although we note
that the remaining populations are
widely distributed as opposed to
concentrated within its range). The
species also continues to occur in
Canada, although it is estimated to have
declined by greater than 92 percent, as
reported in 2013 (Committee on the
Status of Species at Risk in Ontario
2013, p. 4). The conditions of the
remaining 69 currently extant
populations in the United States vary
between being highly resilient,
moderately resilient, or having low
resiliency (see Current Conditions,
above, and section 5.2 in the SSA report
(Service 2019, pp. 43–47)).
Currently, 4 round hickorynut
populations (6 percent) are highly
resilient, 16 (23 percent) are moderately
resilient, and 49 (71 percent) have low
resiliency. Although downward trends
are evident compared to historical
information, 20 highly to moderately
resilient populations in the United
States continue to occupy 4 of the 5
major river basins where the species is
historically known to occur. Current
and ongoing threats from habitat
degradation or loss (Factor A), and
invasive, nonnative species (Factor E),
contribute to the negative effects
associated with the species’ small
population size (Factor E). The
continued occupancy of these 20
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populations (in addition to some survey
information) implies that recent
recruitment is occurring in some
populations, and they maintain a level
of resiliency, redundancy, and
representation. Thus, after assessing the
best available information, we conclude
that the round hickorynut is not
currently in danger of extinction
throughout all of its range. Therefore,
we proceed with determining whether
the round hickorynut is likely to
become an endangered species within
the foreseeable future throughout all of
its range.
As noted above, the threats acting on
the species include habitat degradation
or loss from a variety of sources and
invasive, nonnative species, both of
which contribute to the negative effects
associated with the species’ small
population size. Our analysis revealed
that these threats are likely to continue
into the foreseeable future, or
approximately 20 to 30 years. This
timeframe accounts for reasonable
predictions of threats continuing into
the future based on our examination of
empirical data in our files (e.g., survey
data, how threats are manifesting
themselves on the landscape and the
species, implementation of management
plans and voluntary conservation
actions), and also takes into
consideration the biology of the species
and the licensing schedules of dams
within the species’ range.
The best available information,
including our consideration of
comments we received on the
September 29, 2020 (85 FR 61384),
proposed rule, suggests that the threats
currently acting upon the round
hickorynut are expected to continue
into the foreseeable future. The effects
of water quality and habitat degradation,
and invasive, nonnative species, are
reasonably expected to worsen over
time, including concurrent with
increasing human population trends,
thus further reducing the species’
resiliency, redundancy, and
representation across its range. Our
analysis reveals the potential for either
none or a single population (i.e., the
Grand River in Ohio) to persist as highly
resilient (i.e., continued reproduction
with varied age classes present) in the
foreseeable future, assuming threats
remain or worsen on the landscape.
Additionally, the majority of the
remaining populations would exhibit
low resiliency, while many (between 33
and 71 percent of the current low
condition populations) would
potentially become extinct or
functionally extinct (e.g., significant
habitat degradation; no reproduction
due to highly isolated, non-recruiting
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individuals). Our future analysis also
reveals a high risk that the species
would become extirpated in two of the
five historically occupied river basins
(i.e., Cumberland River basin and Lower
Mississippi River basin). Overall, the
current threats acting on the species and
its habitat are expected to continue, and
there are no indications that these
threats would be lessened or that
declining population trends would be
reverted. Thus, after assessing the best
available information, we conclude that
the round hickorynut is not currently in
danger of extinction but is likely to
become in danger of extinction within
the foreseeable future throughout all of
its range.
Round Hickorynut—Status Throughout
a Significant Portion of Its Range
See above, under Longsolid—Status
Throughout a Significant Portion of Its
Range, for a description of our
evaluation methods and our policy
application.
In undertaking the analysis for the
round hickorynut, we choose to address
the status question first—we consider
information pertaining to the geographic
distribution of both the species and the
threats that the species faces to identify
portions of the range where the species
may be endangered.
We evaluated the range of the round
hickorynut to determine if the species is
in danger of extinction now in any
portion of its range. The range of a
species can theoretically be divided into
portions in an infinite number of ways.
We examined the species entire range in
an attempt to focus this analysis on
portions of the species’ range that may
meet the definition of an endangered
species. For the round hickorynut, we
considered whether the threats or their
effects on the species are greater in any
biologically meaningful portion of the
species’ range than in other portions
such that the species is in danger of
extinction now in that portion.
As similarly described above for the
longsolid, the statutory difference
between an endangered species and a
threatened species is the timeframe in
which the species becomes in danger of
extinction; an endangered species is in
danger of extinction now while a
threatened species is not in danger of
extinction now but is likely to become
so in the foreseeable future. Thus, we
considered the time horizon for the
threats that are driving the round
hickorynut to warrant listing as a
threatened species throughout all of its
range. We then considered whether
these threats or their effects are
occurring in any portion of the species’
range such that the species is in danger
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of extinction now in that portion of its
range. We examined the following
threats: habitat degradation or loss;
invasive, nonnative species; negative
effects associated with small population
size; and the potential for cumulative
effects. We also considered whether
these threats may be exacerbated by
small population size (or low
condition). Overall, we found that
threats are likely acting on individuals
or populations, or even basins, similarly
across the species’ range. These threats
are certain to occur, and in those basins
with few populations that are
predominantly in low condition, these
populations are facing the same threats,
and these threats can be of greater
magnitude in some areas or of greater
impact, given small population sizes.
Three of five basins where round
hickorynut has historically occurred
(Great Lakes, Cumberland River, and
Lower Mississippi River basins) have
been reduced to predominantly low
condition populations. Specifically, the
Great Lakes basin has been reduced
from 25 populations to 5 low condition
populations, 1 medium condition
population, and 1 high condition
population; the Cumberland River basin
has been reduced from 23 populations
to 2 low condition populations; and the
Lower Mississippi River basin has been
reduced from 9 populations to a single
remaining low condition population.
Although there are low condition
populations in every basin in which the
species occurs, because these three
basins have seen their populations
significantly reduced and a
predominance of the Great Lakes basin
populations and the remaining
populations for the other two basins are
currently in low condition, these
circumstances—in combination with the
other threats acting on the species
throughout its range—may indicate that
the species may be in danger of
extinction now in these portions of the
range.
As similarly described above for the
longsolid, small, isolated populations
often exhibit reduced levels of genetic
variability, which diminishes the
species’ capacity to adapt and respond
to environmental changes, thereby
decreasing the probability of long-term
persistence. Small populations may
experience reduced reproductive vigor,
for example, due to inbreeding
depression. Isolated individuals may
have difficulty reproducing. The
problems associated with small
population size and vulnerability to
random demographic fluctuations or
natural catastrophes are further
magnified by synergistic interactions
with other threats, such as those
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discussed above. Based on our review of
information and the synergistic effects
of threats exacerbated by a
predominance of populations in low
condition within the Great Lakes,
Cumberland, and Lower Mississippi
River basins (where populations have
been significantly extirpated), we find
that these three basins are portions of
the round hickorynut’s range with a
potential difference in biological
condition.
Because we have determined the
Great Lakes, Cumberland, and Lower
Mississippi River basins are portions of
the range that may be in danger of
extinction now, we next evaluate
whether those portions may be
significant (see additional discussion
above for the longsolid). We first
examined each of these area’s
contributions to the resiliency,
redundancy, and representation of the
species. Although these basins contain
10 of 69 populations (15 percent)
identified in the SSA report, the Great
Lakes basin consists of 1 population
currently with moderate resiliency and
1 with high resiliency, and the
remaining 5 populations demonstrate
low resiliency; the remaining 3
populations in the Cumberland River
basin and the Lower Mississippi River
basin are all low condition populations.
These low condition populations do not
contribute significantly, either currently
or in the foreseeable future, to the
species’ total resiliency at a biologically
meaningful scale compared to other
representative areas. Although the low
condition populations in these basins
are relatively small, the current and
future redundancy suggests that threats
would be unlikely to extirpate round
hickorynut in the Great Lakes basin, but
there is potential to lose the remaining
three low condition populations under
the current level of threats scenario
(Scenario 1). Overall representation
would be modified through loss of two
currently occupied basins. We evaluated
the best available information for the
Great Lakes, Cumberland River, and
Lower Mississippi River basins in this
context, assessing each portion’s
significance in terms of these
conservation concepts (i.e., resiliency,
representation, and redundancy), and
determined that there is not substantial
information to indicate that any of these
areas may be biologically significant to
the species.
Round hickorynut populations are
widely distributed over nine States and
five major river basins, and we
considered geographic range as a
surrogate for geographic variation and
proxy for potential local adaptation and
adaptive capacity. A river basin is any
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14813
area of land where precipitation collects
and drains off into a common outlet,
such as into a river, bay, or other body
of water. The river basin includes all the
surface water from precipitation runoff
and nearby streams that run downslope
towards the shared outlet, as well as the
groundwater underneath the earth’s
surface. River basins connect into other
drainage basins at lower elevations in a
hierarchical pattern, with smaller subdrainage basins. Given there are no data
indicating genetic or morphological
differentiation between the five major
river basins for the species, and these
specific portions of the range do not
provide high value or high quality
habitat to the species as compared to the
rest of the range, we conclude that these
areas are not biologically significant to
the round hickorynut. Further, the
round hickorynut occurs in similar
aquatic habitats across its range and
does not use unique observable
environmental or behavioral
characteristics attributable to just the
Great Lakes, Cumberland River, or
Lower Mississippi River basin
populations. Therefore, the species
exhibits similar basin-scale use of
habitat.
The Great Lakes, Cumberland River,
and Lower Mississippi River basin
portions occur in stream habitat
comprised of substrate types similar to
the other basins where the round
hickorynut performs the important lifehistory functions of breeding, feeding,
and sheltering, and occur in areas with
water quality sufficient to sustain these
essential life-history traits. These three
basins do not act as refugia for the
species or as an important spawning
ground. In addition, the water quality is
similar throughout the species’ range
with impaired water quality occurring
in all basins. Since the round
hickorynut occurs in similar aquatic
habitats across its range, the Great
Lakes, Cumberland River, and Lower
Mississippi River basin portions provide
similar habitat characteristics as the
remainder of the species’ range.
Therefore, there are no unique habitat
characteristics attributable to just these
basins, and these portions serve a
similar role in supporting the species’
viability as compared to the rest of the
range.
Overall, and in summary, we found
three portions of the round hickorynut’s
range—the Great Lakes, Cumberland,
and Lower Mississippi River basins—
that may have a different status then the
remaining portion of the round
hickorynut’s range. Our analysis
indicated these three basins are not
significant in terms of their contribution
to the species’ resiliency, redundancy,
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and representation, nor were they found
to be significant in terms of high-quality
habitat or habitat that is otherwise
important for the species’ life history.
As a result, while these portions may
have a different biological status, we
determined they are not significant
portions of the species’ range.
Accordingly, no portion of the round
hickorynut’s range provides a basis for
determining that the species is in danger
of extinction in a significant portion of
its range, and we determine that the
round hickorynut is likely to become in
danger of extinction within the
foreseeable future throughout all of its
range. This does not conflict with the
courts’ holdings in Desert Survivors v.
U.S. Department of the Interior, 321 F.
Supp. 3d 1011, 1070–74 (N.D. Cal. 2018)
and Center for Biological Diversity v.
Jewell, 248 F. Supp. 3d 946, 959 (D.
Ariz. 2017) because, in reaching this
conclusion, we did not apply the
aspects of the Final Policy, including
the definition of ‘‘significant’’ that those
court decisions held to be invalid.
ddrumheller on DSK120RN23PROD with RULES2
Round Hickorynut—Determination of
Status
Our review of the best available
scientific and commercial information
indicates that the round hickorynut
meets the definition of a threatened
species. Therefore, we are listing the
round hickorynut as a threatened
species in accordance with sections
3(20) and 4(a)(1) of the Act.
Available Conservation Measures
Conservation measures provided to
species listed as endangered or
threatened species under the Act
include recognition as a listed species,
planning and implementation of
recovery actions, requirements for
Federal protection, and prohibitions
against certain practices. Recognition
through listing results in public
awareness, and conservation by Federal,
State, Tribal, and local agencies, private
organizations, and individuals. The Act
encourages cooperation with the States
and other countries and calls for
recovery actions to be carried out for
listed species. The protection required
by Federal agencies, including the
Service, and the prohibitions against
certain activities are discussed, in part,
below.
The primary purpose of the Act is the
conservation of endangered and
threatened species and the ecosystems
upon which they depend. The ultimate
goal of such conservation efforts is the
recovery of these listed species, so that
they no longer need the protective
measures of the Act. Section 4(f) of the
Act calls for the Service to develop and
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implement recovery plans for the
conservation of endangered and
threatened species. The goal of this
process is to restore listed species to a
point where they are secure, selfsustaining, and functioning components
of their ecosystems.
Recovery planning consists of
preparing draft and final recovery plans,
beginning with the development of a
recovery outline shortly after a species
is listed. The recovery outline guides
the immediate implementation of urgent
recovery actions and describes the
process to be used to develop a recovery
plan. Revisions of the plan may be done
to address continuing or new threats to
the species, as new substantive
information becomes available. The
recovery plan also identifies recovery
criteria for review of when a species
may be ready for reclassification from
endangered to threatened
(‘‘downlisting’’) or removal from
protected status (‘‘delisting’’), and
methods for monitoring recovery
progress. Recovery plans also establish
a framework for agencies to coordinate
their recovery efforts and provide
estimates of the cost of implementing
recovery tasks. Recovery teams
(composed of species experts, Federal
and State agencies, nongovernmental
organizations, and stakeholders) are
often established to develop recovery
plans. When completed, the recovery
outline, draft recovery plan, and the
final recovery plan will be available on
our websites (https://ecos.fws.gov/ecp/
species/9880, and https://ecos.fws.gov/
ecp/species/9879), or from our
Asheville Ecological Services Field
Office (see FOR FURTHER INFORMATION
CONTACT).
Implementation of recovery actions
generally requires the participation of a
broad range of partners, including other
Federal agencies, States, Tribes,
nongovernmental organizations,
businesses, and private landowners.
Examples of recovery actions include
habitat restoration (e.g., restoration of
native vegetation), research, captive
propagation and reintroduction, and
outreach and education. The recovery of
many listed species cannot be
accomplished solely on Federal lands
because their range may occur primarily
or solely on non-Federal lands. To
achieve recovery of these species
requires cooperative conservation efforts
on private, State, and Tribal lands.
Following publication of this rule,
funding for recovery actions will be
available from a variety of sources,
including Federal budgets, State
programs, and cost-share grants for nonFederal landowners, the academic
community, and nongovernmental
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organizations. In addition, pursuant to
section 6 of the Act, the States of New
York, Pennsylvania, Ohio, Indiana,
Michigan, Kentucky, West Virginia,
Virginia, North Carolina, Tennessee,
Alabama, and Mississippi would be
eligible for Federal funds to implement
management actions that promote the
protection or recovery of the longsolid
or round hickorynut or both species.
Information on our grant programs that
are available to aid species recovery can
be found at: https://www.fws.gov/
service/financial-assistance.
Please let us know if you are
interested in participating in recovery
efforts for the longsolid or round
hickorynut. Additionally, we invite you
to submit any new information on these
species whenever it becomes available
and any information you may have for
recovery planning purposes (see FOR
FURTHER INFORMATION CONTACT).
Section 7(a) of the Act requires
Federal agencies to evaluate their
actions with respect to any species that
is listed as an endangered or threatened
species and with respect to its critical
habitat, if any is designated. Regulations
implementing this interagency
cooperation provision of the Act are
codified at 50 CFR part 402. Section
7(a)(2) of the Act requires Federal
agencies to ensure that activities they
authorize, fund, or carry out are not
likely to jeopardize the continued
existence of any endangered or
threatened species or destroy or
adversely modify its critical habitat. If a
Federal action may affect a listed
species or its critical habitat, the
responsible Federal agency (action
agency) must enter into consultation
with the Service.
Federal agency actions within the
species’ habitat that may require
conference, consultation, or both as
described in the preceding paragraph
may include management and any other
landscape-altering activities on Federal
lands administered by the following
agencies:
(1) U.S. Army Corps of Engineers
(channel dredging and maintenance;
dam projects including flood control,
navigation, hydropower, bridge projects,
stream restoration, and Clean Water Act
permitting).
(2) U.S. Department of Agriculture,
including the Natural Resources
Conservation Service and Farm Service
Agency (technical and financial
assistance for projects) and the Forest
Service (aquatic habitat restoration, fire
management plans, fire suppression,
fuel reduction treatments, forest plans,
mining permits).
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(3) U.S. Department of Energy
(renewable and alternative energy
projects).
(4) Federal Energy Regulatory
Commission (interstate pipeline
construction and maintenance, dam
relicensing, and hydrokinetics).
(5) U.S. Department of Transportation
(highway and bridge construction and
maintenance).
(6) U.S. Fish and Wildlife Service
(issuance of section 10 permits for
enhancement of survival, habitat
conservation plans, and safe harbor
agreements; National Wildlife Refuge
planning and refuge activities; Partners
for Fish and Wildlife program projects
benefiting these species or other listed
species; Wildlife and Sportfish
Restoration program sportfish stocking).
(7) Environmental Protection Agency
(water quality criteria, permitting).
(8) Tennessee Valley Authority (flood
control, navigation, hydropower, and
land management for the Tennessee
River system).
(9) Office of Surface Mining
Reclamation and Enforcement (land
resource management plans, mining
permits, oil and natural gas permits,
abandoned mine land projects, and
renewable energy development).
(10) National Park Service (aquatic
habitat restoration, fire management
plans, fire suppression, fuel reduction
treatments, land management plans,
mining permits).
It is our policy, as published in the
Federal Register on July 1, 1994 (59 FR
34272), to identify to the maximum
extent practicable at the time a species
is listed, those activities that would or
would not constitute a violation of
section 9 of the Act. The intent of this
policy is to increase public awareness of
the effect of a listing on proposed and
ongoing activities within the range of
the listed species. The discussion below
regarding protective regulations under
section 4(d) of the Act complies with
our policy.
II. Final Rule Issued Under Section 4(d)
of the Act
ddrumheller on DSK120RN23PROD with RULES2
Background
Section 4(d) of the Act contains two
sentences. The first sentence states that
the Secretary shall issue such
regulations as she deems necessary and
advisable to provide for the
conservation of species listed as
threatened. The U.S. Supreme Court has
noted that statutory language like
‘‘necessary and advisable’’ demonstrates
a large degree of deference to the agency
(see Webster v. Doe, 486 U.S. 592
(1988)). Conservation is defined in the
Act to mean the use of all methods and
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procedures which are necessary to bring
any endangered species or threatened
species to the point at which the
measures provided pursuant to the Act
are no longer necessary. Additionally,
the second sentence of section 4(d) of
the Act states that the Secretary may by
regulation prohibit with respect to any
threatened species any act prohibited
under section 9(a)(1), in the case of fish
or wildlife, or section 9(a)(2), in the case
of plants. Thus, the combination of the
two sentences of section 4(d) provides
the Secretary with wide latitude of
discretion to select and promulgate
appropriate regulations tailored to the
specific conservation needs of the
threatened species. The second sentence
grants particularly broad discretion to
the Service when adopting the
prohibitions under section 9.
The courts have recognized the extent
of the Secretary’s discretion under this
standard to develop rules that are
appropriate for the conservation of a
species. For example, courts have
upheld rules developed under section
4(d) as a valid exercise of agency
authority where they prohibited take of
threatened wildlife or include a limited
taking prohibition (see Alsea Valley
Alliance v. Lautenbacher, 2007 U.S.
Dist. Lexis 60203 (D. Or. 2007);
Washington Environmental Council v.
National Marine Fisheries Service, 2002
U.S. Dist. Lexis 5432 (W.D. Wash.
2002)). Courts have also upheld 4(d)
rules that do not address all of the
threats a species faces (see State of
Louisiana v. Verity, 853 F.2d 322 (5th
Cir. 1988)). As noted in the legislative
history when the Act was initially
enacted, ‘‘once an animal is on the
threatened list, the Secretary has an
almost infinite number of options
available to [her] with regard to the
permitted activities for those species.
[She] may, for example, permit taking,
but not importation of such species, or
[s]he may choose to forbid both taking
and importation but allow the
transportation of such species’’ (H.R.
Rep. No. 412, 93rd Cong., 1st Sess.
1973).
Exercising its authority under section
4(d), we have developed a rule that is
designed to address the longsolid’s and
round hickorynut’s specific threats and
conservation needs. Although the
statute does not require us to make a
‘‘necessary and advisable’’ finding with
respect to the adoption of specific
prohibitions under section 9, we find
that this rule as a whole satisfies the
requirement in section 4(d) of the Act to
issue regulations deemed necessary and
advisable to provide for the
conservation of the longsolid and round
hickorynut. As discussed above under
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14815
Summary of Biological Status and
Threats, we have concluded that the
longsolid and round hickorynut are
likely to become in danger of extinction
within the foreseeable future primarily
due to declines in water quality; loss of
stream flow; fragmentation, alteration,
and deterioration of instream habitats;
and nonnative species. These threats,
which are expected to be exacerbated by
continued urbanization and the effects
of climate change, were central to our
assessment of the future viability of the
longsolid and round hickorynut. The
provisions of this 4(d) rule will promote
conservation of the longsolid and round
hickorynut by encouraging management
of the landscape in ways that meet both
land management considerations and
the conservation needs of the longsolid
and round hickorynut and are
consistent with land management
considerations. The provisions of this
rule are one of many tools that we will
use to promote the conservation of the
longsolid and round hickorynut.
Section 7(a)(2) of the Act requires
Federal agencies, including the Service,
to ensure that any action they fund,
authorize, or carry out is not likely to
jeopardize the continued existence of
any endangered species or threatened
species or result in the destruction or
adverse modification of designated
critical habitat of such species.
If a Federal action may affect a listed
species or its critical habitat, the
responsible Federal agency (action
agency) must enter into consultation
with us. Examples of actions that are
subject to the section 7 consultation
process are actions on State, Tribal,
local, or private lands that require a
Federal permit (such as a permit from
the U.S. Army Corps of Engineers under
section 404 of the Clean Water Act (33
U.S.C. 1251 et seq.) or a permit from the
Service under section 10 of the Act) or
that involve some other Federal action
(such as funding from the Federal
Highway Administration, Federal
Aviation Administration, or the Federal
Emergency Management Agency).
Federal actions not affecting listed
species or critical habitat—and actions
on State, Tribal, local, or private lands
that are not federally funded,
authorized, or carried out by a Federal
agency—do not require section 7
consultation.
This obligation does not change in
any way for a threatened species with a
species-specific 4(d) rule. Actions that
result in a determination by a Federal
agency of ‘‘not likely to adversely
affect’’ continue to require the Service’s
written concurrence and actions that are
‘‘likely to adversely affect’’ a species
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ddrumheller on DSK120RN23PROD with RULES2
require formal consultation and the
formulation of a biological opinion.
Provisions of the 4(d) Rule
This 4(d) rule will provide for the
conservation of the longsolid and round
hickorynut by prohibiting the following
activities, except as otherwise
authorized or permitted: importing or
exporting; take; possession and other
acts with unlawfully taken specimens;
delivering, receiving, carrying,
transporting, or shipping in interstate or
foreign commerce in the course of
commercial activity; or selling or
offering for sale in interstate or foreign
commerce. This protective regulation
includes most of these prohibitions
because the longsolid and round
hickorynut are at risk of extinction in
the foreseeable future and putting these
prohibitions in place will help to
prevent further declines, preserve the
species’ remaining populations, slow
their rate of decline, and decrease
synergistic, negative effects from other
ongoing or future threats.
As discussed above under Summary
of Biological Status and Threats,
multiple factors are affecting the status
of the longsolid and round hickorynut.
A range of activities have the potential
to affect these species, including
declines in water quality, loss of stream
flow, riparian and instream
fragmentation, alteration and
deterioration of instream habitats, and
nonnative species. These threats, which
are expected to be exacerbated by
continued urbanization and the effects
of climate change, were central to our
assessment of the future viability of the
longsolid and round hickorynut.
Therefore, we prohibit actions resulting
in the incidental take of longsolid and
round hickorynut by altering or
degrading the habitat. Regulating
incidental take resulting from these
activities will help preserve the species’
remaining populations, slow their rate
of decline, and decrease synergistic,
negative effects from other stressors.
Under the Act, ‘‘take’’ means to
harass, harm, pursue, hunt, shoot,
wound, kill, trap, capture, or collect, or
to attempt to engage in any such
conduct. Some of these provisions have
been further defined in regulation at 50
CFR 17.3. Take can result knowingly or
otherwise, by direct and indirect
impacts, intentionally or incidentally.
Regulating incidental and intentional
take of the longsolid and round
hickorynut will help preserve and
recover remaining populations of these
species, including slowing their date of
decline and decreasing negative effects
from threats. Therefore, we prohibit
intentional take of longsolid and round
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hickorynut, except for take resulting
from those actions and activities
specifically excepted by the 4(d) rule.
The 4(d) rule provides for the
conservation of the species by allowing
exceptions, including certain standard
exceptions, to incidental take
prohibitions caused by actions and
activities that, while they may have
some minimal level of disturbance to
the longsolid and round hickorynut, are
not expected to negatively impact the
species’ conservation and recovery
efforts. The proposed exceptions to
these prohibitions include incidental
take associated with (1) conservation
and restoration efforts by State wildlife
agencies, (2) channel restoration
projects, (3) bank restoration projects,
and (4) forest management activities that
implement State-approved BMPs.
The first exception is for incidental
take associated with conservation and
restoration efforts for listed species
conducted by State wildlife agencies,
and including, but not limited to,
population monitoring, relocation, and
collection of broodstock; tissue
collection for genetic analysis; captive
propagation; and subsequent stocking
into currently occupied and unoccupied
areas within the historical range of the
species. We recognize our special and
unique relationship with our State
natural resource agency partners in
contributing to conservation of listed
species. State agencies often possess
scientific data and valuable expertise on
the status and distribution of
endangered, threatened, and candidate
species of wildlife and plants. State
agencies, because of their authorities
and their close working relationships
with local governments and
landowners, are in a unique position to
assist us in implementing all aspects of
the Act. In this regard, section 6 of the
Act provides that we shall cooperate to
the maximum extent practicable with
the States in carrying out programs
authorized by the Act. Therefore, in
addition to the first exception for
incidental take described above, any
qualified employee or agent of a State
conservation agency that is a party to a
cooperative agreement with us in
accordance with section 6(c) of the Act,
who is designated by his or her agency
for such purposes, and coordinates
these activities with us, would be able
to conduct activities designed to
conserve the longsolid and round
hickorynut that may result in otherwise
prohibited take without additional
authorization.
The second exception is for incidental
take resulting from channel and bank
restoration projects for creation of
natural, physically stable, ecologically
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functioning streams (or stream and
wetland systems) that are reconnected
with their groundwater aquifers. These
projects can be accomplished using a
variety of methods, but the desired
outcome is a natural channel with low
shear stress (force of water moving
against the channel); bank heights that
enable reconnection to the floodplain; a
reconnection of surface and
groundwater systems, resulting in
perennial flows in the channel; riffles
and pools composed of existing soil,
rock, and wood instead of large
imported materials; low compaction of
soils within adjacent riparian areas; and
inclusion of riparian wetlands.
The third exception is for incidental
take caused by bank stabilization
projects that use bioengineering
methods to replace pre-existing, bare,
eroding stream banks with vegetated,
stable stream banks, thereby reducing
bank erosion and instream
sedimentation and improving habitat
conditions for the species. Following
these bioengineering methods, stream
banks may be stabilized using native
species live stakes (live, vegetative
cuttings inserted or tamped into the
ground in a manner that allows the
stake to take root and grow), native
species live fascines (live branch
cuttings, usually willows, bound
together into long, cigar-shaped
bundles), or native species brush
layering (cuttings or branches of easily
rooted tree species layered between
successive lifts of soil fill). Native
species vegetation includes woody and
herbaceous species appropriate for the
region and habitat conditions. These
methods will not include the sole use of
quarried rock (rip-rap) or the use of rock
baskets or gabion structures. Prior to
channel restoration and bank
stabilization actions, surveys conducted
in coordination with the appropriate
Service field office to determine
presence of longsolid and round
hickorynut must be performed, and if
located, relocation prior to project
implementation may be necessary, with
post-implementation monitoring.
The fourth exception is for incidental
take associated with forest management
activities that implement Stateapproved BMPs. Forest landowners who
properly implement these BMPs are
helping conserve the longsolid and
round hickorynut, and this 4(d) rule is
an incentive for all landowners to
properly implement BMPs to avoid any
take implications.
We reiterate that these actions and
activities may result in some minimal
level of take of the longsolid and round
hickorynut, but they are unlikely to
negatively impact the species’
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conservation and recovery efforts. To
the contrary, we expect they would have
a net beneficial effect on the species.
Across the species’ range, instream
habitats have been degraded physically
by sedimentation and by direct channel
disturbance. The activities in the 4(d)
rule are intended to improve habitat
conditions for the species in the long
term.
We may issue permits to carry out
otherwise prohibited activities,
including those described above,
involving threatened wildlife under
certain circumstances. Regulations
governing permits are codified at 50
CFR 17.32. With regard to threatened
wildlife, a permit may be issued for the
following purposes: For scientific
purposes, to enhance propagation or
survival, for economic hardship, for
zoological exhibition, for educational
purposes, for incidental taking, or for
special purposes consistent with the
purposes of the Act. The statute also
contains certain exemptions from the
prohibitions, which are found in
sections 9 and 10 of the Act.
We recognize the special and unique
relationship with our State natural
resource agency partners in contributing
to conservation of listed species. State
agencies often possess scientific data
and valuable expertise on the status and
distribution of endangered, threatened,
and candidate species of wildlife and
plants. State agencies, because of their
authorities and their close working
relationships with local governments
and landowners, are in a unique
position to assist us in implementing all
aspects of the Act. In this regard, section
6 of the Act provides that we must
cooperate to the maximum extent
practicable with the States in carrying
out programs authorized by the Act.
Therefore, any qualified employee or
agent of a State conservation agency that
is a party to a cooperative agreement
with us in accordance with section 6(c)
of the Act, who is designated by his or
her agency for such purposes, will be
able to conduct activities designed to
conserve the longsolid and round
hickorynut that may result in otherwise
prohibited take without additional
authorization.
Nothing in this 4(d) rule will change
in any way the recovery planning
provisions of section 4(f) of the Act, the
consultation requirements under section
7 of the Act, or the ability of the Service
to enter into partnerships for the
management and protection of the
longsolid and round hickorynut.
However, interagency cooperation may
be further streamlined through planned
programmatic consultations for the
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species between Federal agencies and
the Service.
III. Critical Habitat for the Longsolid
and Round Hickorynut
Background
Critical habitat is defined in section 3
of the Act as:
(1) The specific areas within the
geographical area occupied by the
species, at the time it is listed in
accordance with the Act, on which are
found those physical or biological
features:
(a) Essential to the conservation of the
species, and
(b) Which may require special
management considerations or
protection; and
(2) Specific areas outside the
geographical area occupied by the
species at the time it is listed, upon a
determination that such areas are
essential for the conservation of the
species.
Our regulations at 50 CFR 424.02
define the geographical area occupied
by the species as an area that may
generally be delineated around species’
occurrences, as determined by the
Secretary (i.e., range). Such areas may
include those areas used throughout all
or part of the species’ life cycle, even if
not used on a regular basis (e.g.,
migratory corridors, seasonal habitats,
and habitats used periodically, but not
solely by vagrant individuals).
Conservation, as defined under
section 3 of the Act, means to use and
the use of all methods and procedures
that are necessary to bring an
endangered or threatened species to the
point at which the measures provided
pursuant to the Act are no longer
necessary. Such methods and
procedures include, but are not limited
to, all activities associated with
scientific resources management such as
research, census, law enforcement,
habitat acquisition and maintenance,
propagation, live trapping, and
transplantation, and, in the
extraordinary case where population
pressures within a given ecosystem
cannot be otherwise relieved, may
include regulated taking.
Critical habitat receives protection
under section 7 of the Act through the
requirement that Federal agencies
ensure, in consultation with the Service,
that any action they authorize, fund, or
carry out is not likely to result in the
destruction or adverse modification of
critical habitat. The designation of
critical habitat does not affect land
ownership or establish a refuge,
wilderness, reserve, preserve, or other
conservation area. Such designation also
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14817
does not allow the government or public
to access private lands. Such
designation does not require
implementation of restoration, recovery,
or enhancement measures by nonFederal landowners. Where a landowner
requests Federal agency funding or
authorization for an action that may
affect a listed species or critical habitat,
the Federal agency would be required to
consult with the Service under section
7(a)(2) of the Act. However, even if the
Service were to conclude that the
proposed activity would likely result in
destruction or adverse modification of
the critical habitat, the Federal action
agency and the landowner are not
required to abandon the proposed
activity, or to restore or recover the
species; instead, they must implement
‘‘reasonable and prudent alternatives’’
to avoid destruction or adverse
modification of critical habitat.
Under the first prong of the Act’s
definition of critical habitat, areas
within the geographical area occupied
by the species at the time it was listed
are included in a critical habitat
designation if they contain physical or
biological features (1) which are
essential to the conservation of the
species and (2) which may require
special management considerations or
protection. For these areas, critical
habitat designations identify, to the
extent known using the best scientific
data available, those physical or
biological features that are essential to
the conservation of the species (such as
space, food, cover, and protected
habitat).
Under the second prong of the Act’s
definition of critical habitat, we can
designate critical habitat in areas
outside the geographical area occupied
by the species at the time it is listed,
upon a determination that such areas
are essential for the conservation of the
species.
Section 4 of the Act requires that we
designate critical habitat on the basis of
the best scientific data available.
Further, our Policy on Information
Standards Under the Endangered
Species Act (published in the Federal
Register on July 1, 1994 (59 FR 34271)),
the Information Quality Act (section 515
of the Treasury and General
Government Appropriations Act for
Fiscal Year 2001 (Pub. L. 106–554; H.R.
5658)), and our associated Information
Quality Guidelines provide criteria,
establish procedures, and provide
guidance to ensure that our decisions
are based on the best scientific data
available. They require our biologists, to
the extent consistent with the Act and
with the use of the best scientific data
available, to use primary and original
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sources of information as the basis for
recommendations to designate critical
habitat.
When we are determining which areas
should be designated as critical habitat,
our primary source of information is
generally the information from the SSA
report and information developed
during the listing process for the
species. Additional information sources
may include any generalized
conservation strategy, criteria, or outline
that may have been developed for the
species; the recovery plan for the
species; articles in peer-reviewed
journals; conservation plans developed
by States and counties; scientific status
surveys and studies; biological
assessments; other unpublished
materials; or experts’ opinions or
personal knowledge.
Habitat is dynamic, and species may
move from one area to another over
time. We recognize that critical habitat
designated at a particular point in time
may not include all of the habitat areas
that we may later determine are
necessary for the recovery of the
species. For these reasons, a critical
habitat designation does not signal that
habitat outside the designated area is
unimportant or may not be needed for
recovery of the species. Areas that are
important to the conservation of the
species, both inside and outside the
critical habitat designation, will
continue to be subject to: (1)
Conservation actions implemented
under section 7(a)(1) of the Act; (2)
regulatory protections afforded by the
requirement in section 7(a)(2) of the Act
for Federal agencies to ensure their
actions are not likely to jeopardize the
continued existence of any endangered
or threatened species; and (3) the
prohibitions found in the section 4(d)
rule. Federally funded or permitted
projects affecting listed species outside
their designated critical habitat areas
may still result in jeopardy findings in
some cases. These protections and
conservation tools will continue to
contribute to recovery of these species.
Similarly, critical habitat designations
made on the basis of the best available
information at the time of designation
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will not control the direction and
substance of future recovery plans,
habitat conservation plans (HCPs), or
other species conservation planning
efforts if new information available at
the time of these planning efforts calls
for a different outcome.
Physical or Biological Features
Essential to the Conservation of the
Species
In accordance with section 3(5)(A)(i)
of the Act and regulations at 50 CFR
424.12(b), in determining which areas
we will designate as critical habitat from
within the geographical area occupied
by the species at the time of listing, we
consider the physical or biological
features that are essential to the
conservation of the species and which
may require special management
considerations or protection. The
regulations at 50 CFR 424.02 define
‘‘physical or biological features essential
to the conservation of the species’’ as
the features that occur in specific areas
and that are essential to support the lifehistory needs of the species, including,
but not limited to, water characteristics,
soil type, geological features, sites, prey,
vegetation, symbiotic species, or other
features. A feature may be a single
habitat characteristic or a more complex
combination of habitat characteristics.
Features may include habitat
characteristics that support ephemeral
or dynamic habitat conditions. Features
may also be expressed in terms relating
to principles of conservation biology,
such as patch size, distribution
distances, and connectivity. For
example, physical features essential to
the conservation of the species might
include gravel of a particular size
required for spawning, alkaline soil for
seed germination, protective cover for
migration, or susceptibility to flooding
or fire that maintains necessary earlysuccessional habitat characteristics.
Biological features might include prey
species, forage grasses, specific kinds or
ages of trees for roosting or nesting,
symbiotic fungi, or absence of a
particular level of nonnative species
consistent with conservation needs of
the listed species. The features may also
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be combinations of habitat
characteristics and may encompass the
relationship between characteristics or
the necessary amount of a characteristic
essential to support the life history of
the species.
In considering whether features are
essential to the conservation of the
species, we may consider an appropriate
quality, quantity, and spatial and
temporal arrangement of habitat
characteristics in the context of the lifehistory needs, condition, and status of
the species. These characteristics
include, but are not limited to, space for
individual and population growth and
for normal behavior; food, water, air,
light, minerals, or other nutritional or
physiological requirements; cover or
shelter; sites for breeding, reproduction,
or rearing (or development) of offspring;
and habitats that are protected from
disturbance.
As described above under Summary
of Biological Status and Threats,
longsolid and round hickorynut mussels
occur in river or stream reaches.
Occasional or regular interaction among
individuals in different reaches not
interrupted by a barrier likely occurs,
but in general, interaction is strongly
influenced by habitat fragmentation and
distance between occupied river or
stream reaches. Once released from their
fish host, freshwater mussels are
benthic, generally sedentary aquatic
organisms and closely associated with
appropriate habitat patches within a
river or stream.
We derive the specific physical or
biological features essential for the
longsolid and round hickorynut from
studies of these species’ (or appropriate
surrogate species’) habitat, ecology, and
life history. The primary habitat
elements that influence resiliency of the
longsolid and round hickorynut include
water quality, water quantity, substrate,
habitat connectivity, and the presence of
host fish species to ensure recruitment.
These features are also described above
as resource needs under Summary of
Biological Status and Threats, and a full
description is available in the SSA
reports; the individuals’ needs are
summarized below in Table 1.
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TABLE 1—REQUIREMENTS FOR EACH LIFE STAGE OF THE LONGSOLID AND ROUND HICKORYNUT MUSSELS
Life stage
Resources needed to complete life stage 1
Source
Fertilized eggs—early spring ..............................
• Clear, flowing water
• Sexually mature males upstream from sexually mature females
• Appropriate spawning temperatures
• Clear, flowing water
• Enough flow to keep glochidia or
conglutinates adrift and to attract drift-feeding host fish
• Presence of host fish for attachment
• Clear, flowing water
• Host fish dispersal
• Appropriate interstitial chemistry; low salinity, low ammonia, low copper and other
contaminants, high dissolved oxygen
• Appropriate substrate (clean gravel/sand/
cobble) for settlement
• Clear, flowing water
• Appropriate substrate (stable gravel and
coarse sand free from excessive silt)
• Adequate food availability (phytoplankton
and detritus)
• High dissolved oxygen
• Appropriate water temperature
Berg et al. 2008, p. 397; Haag 2012, pp. 38–
39.
Glochidia—late spring to early summer .............
Juveniles—excystment from host fish to approx.
0.8 in (∼20 mm) shell length.
Adults—greater than 0.8 in (20 mm) shell
length.
Strayer 2008, p. 65; Haag 2012, pp. 41–42.
Dimock and Wright 1993, pp. 188–190;
Sparks and Strayer 1998, p. 132;
Augspurger et al. 2003, p. 2,574;
Augspurger et al. 2007, p. 2,025; Strayer
and Malcom 2012, pp. 1,787–1,788.
Yeager et al. 1994, p. 221; Nichols and
Garling 2000, p. 881; Chen et al. 2001, p.
214; Spooner and Vaughn 2008, p. 308.
1 These resource needs are common among North American freshwater mussels; however, due to lack of species-specific research, parameters specific to longsolid and round hickorynut are unavailable.
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Summary of Essential Physical or
Biological Features
We derive the specific physical or
biological features essential to the
conservation of the longsolid and round
hickorynut from studies of the species’
habitat, ecology, and life history as
described below. Additional
information can be found in chapter 4
of the SSA reports (Service 2018, pp.
27–32; Service 2019, pp. 30–39), both of
which are available on https://
www.regulations.gov under Docket No.
FWS–R4–ES–2020–0010. We have
determined that the following physical
or biological features are essential to the
conservation of the longsolid and round
hickorynut:
(1) Adequate flows, or a hydrologic
flow regime (magnitude, timing,
frequency, duration, rate of change, and
overall seasonality of discharge over
time), necessary to maintain benthic
habitats where the species are found
and to maintain stream connectivity,
specifically providing for the exchange
of nutrients and sediment for
maintenance of the mussels’ and fish
host’s habitat and food availability,
maintenance of spawning habitat for
native fishes, and the ability for newly
transformed juveniles to settle and
become established in their habitats.
Adequate flows ensure delivery of
oxygen, enable reproduction, deliver
food to filter-feeding mussels, and
reduce contaminants and fine sediments
from interstitial spaces. Stream velocity
is not static over time, and variations
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may be attributed to seasonal changes
(with higher flows in winter/spring and
lower flows in summer/fall), extreme
weather events (e.g., drought or floods),
or anthropogenic influence (e.g., flow
regulation via impoundments).
(2) Suitable substrates and connected
instream habitats, characterized by
geomorphically stable stream channels
and banks (i.e., channels that maintain
lateral dimensions, longitudinal
profiles, and sinuosity patterns over
time without an aggrading or degrading
bed elevation) with habitats that support
a diversity of freshwater mussel and
native fish (such as, stable riffle-runpool habitats that provide flow refuges
consisting of predominantly silt-free,
stable sand, gravel, and cobble
substrates).
(3) Water and sediment quality
necessary to sustain natural
physiological processes for normal
behavior, growth, and viability of all life
stages, including (but not limited to):
Dissolved oxygen (generally above 2 to
3 parts per million (ppm)), salinity
(generally below 2 to 4 ppm), and
temperature (generally below 86 °F (°F)
(30 °Celsius (°C)). Additionally, water
and sediment should be low in
ammonia (generally below 0.5 ppm total
ammonia-nitrogen) and heavy metal
concentrations, and lack excessive total
suspended solids and other pollutants
(see Threats Analysis, above).
(4) The presence and abundance of
fish hosts necessary for recruitment of
the longsolid (currently unknown, likely
includes minnows of the family
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Cyprinidae and banded sculpin (Cottus
carolinae)) and the round hickorynut
(i.e., eastern sand darter (Ammocrypta
pellucida), emerald darter (Etheostoma
baileyi), greenside darter (E.
blennioides), Iowa darter (E. exile),
fantail darter (E. flabellare), Cumberland
darter (E. susanae), spangled darter (E.
obama), variegate darter (E. variatum),
blackside darter (Percina maculata),
frecklebelly darter (P. stictogaster), and
banded sculpin).
Special Management Considerations or
Protection
When designating critical habitat, we
assess whether the specific areas within
the geographical area occupied by the
species at the time of listing contain
features which are essential to the
conservation of the species and which
may require special management
considerations or protection.
The features essential to the
conservation of the longsolid and round
hickorynut may require special
management considerations or
protections to reduce the following
threats: (1) Alteration of the natural flow
regime (modifying the natural
hydrograph and seasonal flows),
including water withdrawals, resulting
in flow reduction and available water
quantity; (2) urbanization of the
landscape, including (but not limited to)
land conversion for urban and
commercial use, infrastructure
(pipelines, roads, bridges, utilities), and
urban water uses (resource extraction
activities, water supply reservoirs,
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wastewater treatment, etc.); (3)
significant alteration of water quality
and nutrient pollution from a variety of
activities, such as mining and
agricultural activities; (4) impacts from
invasive species; (5) land use activities
that remove large areas of forested
wetlands and riparian systems; (6)
culvert and pipe installation that creates
barriers to movement for the longsolid
and round hickorynut, or their host
fishes; (7) changes and shifts in seasonal
precipitation patterns as a result of
climate change; and (8) other watershed
and floodplain disturbances that release
sediments, pollutants, or nutrients into
the water.
Management activities that could
ameliorate these threats include, but are
not limited to: Use of BMPs designed to
reduce sedimentation, erosion, and bank
destruction; protection of riparian
corridors and woody vegetation;
moderation of surface and ground water
withdrawals to maintain natural flow
regimes; improved stormwater
management; and reduction of other
watershed and floodplain disturbances
that release sediments, pollutants, or
nutrients into the water.
In summary, we find that the
occupied areas we are designating as
critical habitat contain the physical or
biological features that are essential to
the conservation of the species and that
may require special management
considerations or protection. Special
management considerations or
protection may be required of the
Federal action agency to eliminate, or to
reduce to negligible levels, the threats
affecting the physical and biological
features of each unit.
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Criteria Used To Identify Critical
Habitat
As required by section 4(b)(2) of the
Act, we use the best scientific data
available to designate critical habitat. In
accordance with the Act and our
implementing regulations at 50 CFR
424.12(b), we review available
information pertaining to the habitat
requirements of the species and identify
specific areas within the geographical
area occupied by the species at the time
of listing and any specific areas outside
the geographical area occupied by the
species to be considered for designation
as critical habitat. We are not
designating any areas outside the
geographical area occupied by the
longsolid or round hickorynut because
we have not identified any unoccupied
areas that meet the definition of critical
habitat, and we have determined that
occupied areas are sufficient to conserve
these two species.
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Methodology Used For Selection of
Units
First, we included stronghold (high)
or medium condition populations
(resiliency) remaining from historical
conditions. These populations show
recruitment or varied age class
structure, and could be used for
recovery actions to re-establish
populations within basins through
propagation activities or augment other
populations through direct
translocations within their basins.
Second, we evaluated spatial
representation and redundancy across
the species’ ranges, to include last
remaining consistently observable
population(s) in major river basins and
the last remaining population(s) in
States if necessary, as States are crucial
partners in monitoring and recovery
efforts.
Third, we examined the overall
contribution of medium condition
populations and threats to those
populations. Adjacency and
connectivity to stronghold and medium
populations was considered, and we did
not include populations that have a
potentially low likelihood of recovery
due to limited abundances or
populations currently under a high level
of threats.
Finally, we evaluated overlap of
longsolid and round hickorynut
occurrences, as well as other listed
aquatic species and designated critical
habitat, to see if there are ongoing
conservation and monitoring efforts that
can be capitalized on for efficiency.
Rangewide recovery considerations,
such as maintaining existing genetic
diversity and striving for representation
of all major portions of the species’
current ranges, were considered in
formulating these critical habitat
designations. For example, in the
Cumberland River basin, there is only
one remaining population of the
longsolid (mainstem Cumberland River)
and only two populations remaining of
the round hickorynut (Buck Creek and
Rockcastle River). In addition, in the
Mississippi River basin, only one
population of the round hickorynut
remains (Big Black River). The
distribution of the longsolid and round
hickorynut in these basins is
substantially reduced when compared
to historical data that indicate these
species were formerly much more
widespread within these drainages.
Therefore, these rivers and streams were
included to maintain basin
representation.
The critical habitat designation does
not include all rivers and streams
currently occupied by the species, nor
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all rivers and streams known to have
been occupied by the species
historically. Instead, it includes only the
occupied rivers and streams within the
current range that we determined have
the physical or biological features that
are essential to the conservation of these
species and meet the definition of
critical habitat. These rivers and streams
contain populations large and dense
enough and most likely to be selfsustaining over time (despite
fluctuations in local conditions), and
also have retained the physical or
biological features that will allow for the
maintenance and expansion of existing
populations. These units also represent
populations that are stable and
distributed over a wide geographic area.
We are not designating any areas
outside the geographical area currently
occupied by either the longsolid or
round hickorynut because we
determined that occupied areas are
sufficient to conserve the two species.
Accordingly, we did not find any
unoccupied areas to be essential to the
conservation of these species.
Sources of data for these critical
habitat designations include multiple
databases maintained by universities,
information from State agencies
throughout the species’ ranges, and
numerous survey reports on streams
throughout the species’ ranges (see SSA
reports (Service 2018, entire; Service
2019, entire)). We have also reviewed
available information that pertains to
the habitat requirements of these
species. Sources of information on
habitat requirements include studies
conducted at occupied sites and
published in peer-reviewed articles,
agency reports, and data collected
during monitoring efforts (Service 2018,
entire; Service 2019, entire).
In summary, for areas within the
geographic area occupied by these
species at the time of listing, we
delineated critical habitat unit
boundaries using a precise set of
criteria. Specifically, we identified river
and stream reaches with observations
from 2000 to present, given the variable
data associated with timing and
frequency of mussel surveys conducted
throughout the species’ ranges. We
determined it is reasonable to find these
areas occupied due to the longevity of
the longsolid, the potential for
incomplete survey detections for the
round hickorynut, highly variable recent
survey information across both species’
ranges, and available State heritage
databases and information support for
the likelihood of both species’
continued presence in these areas
within this timeframe. Specific habitat
areas were delineated based on Natural
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Heritage Element Occurrences, and
unpublished survey data provided by
States, universities, and
nongovernmental organizations. These
areas provide habitat for longsolid and
round hickorynut populations and are
large enough to be self-sustaining over
time, despite fluctuations in local
conditions. The areas within the critical
habitat units represent continuous river
and stream reaches of free-flowing
habitat patches capable of sustaining
host fishes and allowing for seasonal
transport of glochidia, which are
essential for reproduction and dispersal
of longsolid and round hickorynut. We
consider portions of the following rivers
and streams to be occupied by the
species at the time of listing, and meet
the definition of critical habitat:
(1) Longsolid—French Creek,
Allegheny River, Shenango River,
Middle Island Creek, Little Kanawha
River, Elk River, Kanawha River,
Licking River, Green River, Cumberland
River, Clinch River, and Paint Rock
River (see Final Critical Habitat
Designation, below).
(2) Round hickorynut—Shenango
River, Grand River, Tippecanoe River,
Middle Island Creek, Little Kanawha
River, Elk River, Kanawha River,
Licking River, Rockcastle River, Buck
Creek, Green River, Paint Rock River,
Duck River, and Big Black River (see
Final Critical Habitat Designation,
below).
Critical Habitat Maps
When determining critical habitat
boundaries, we made every effort to
avoid including developed areas such as
lands covered by buildings, pavement,
and other structures because such lands
lack physical or biological features
necessary for the longsolid and round
hickorynut. The scale of the maps we
prepared under the parameters for
publication within the Code of Federal
Regulations may not reflect the
exclusion of such developed lands. Any
such lands inadvertently left inside
critical habitat boundaries shown on the
maps of this rule have been excluded by
text in the rule and are not designated
as critical habitat. Therefore, a Federal
action involving these lands will not
trigger section 7 consultation with
respect to critical habitat and the
requirement of no adverse modification
unless the specific action will affect the
physical or biological features in the
adjacent critical habitat.
We are designating as critical habitat
stream reaches that we have determined
are occupied at the time of listing (i.e.,
currently occupied) and that contain
one or more of the physical or biological
features that are essential to support
life-history processes of these species.
Twelve units for the longsolid and 14
units for the round hickorynut are
designated based on the presence of the
physical or biological features that
support the longsolid’s or round
hickorynut’s life-history processes. All
of the units for both species contain all
of the identified physical or biological
features and support multiple lifehistory processes.
The critical habitat designation is
defined by the map or maps, as
modified by any accompanying
regulatory text, presented at the end of
this document under Regulation
Promulgation. We include more detailed
information on the boundaries of the
critical habitat designation in the
preamble of this document. We will
make the coordinates or plot points or
both on which each map is based
available to the public on https://
www.regulations.gov at Docket No.
FWS–R4–ES–2020–0010.
Final Critical Habitat Designation
We are designating a total of 1,115
river mi (1,794 km) in 12 units as
occupied critical habitat for the
longsolid and a total of 921 river mi
(1,482 km) in 14 units as occupied
critical habitat for the round hickorynut.
All or portions of some of these units
overlap, and all 26 units are occupied
by one or both species. The critical
habitat areas we describe below
constitute our current best assessment of
areas that meet the definition of critical
habitat for the longsolid and round
hickorynut. The 12 areas designated as
critical habitat for the longsolid are:
French Creek, Allegheny River,
Shenango River, Middle Island Creek,
Little Kanawha River, Elk River,
Kanawha River, Licking River, Green
River, Cumberland River, Clinch River,
and Paint Rock River. The 14 areas
designated as critical habitat for the
round hickorynut are: Shenango River,
Grand River, Tippecanoe River, Middle
Island Creek, Little Kanawha River, Elk
River, Kanawha River, Licking River,
Rockcastle River, Buck Creek, Green
River, Paint Rock River, Duck River, and
Big Black River. Tables 2 and 3 show
the critical habitat units and the
approximate river miles of each unit.
TABLE 2—CRITICAL HABITAT UNITS FOR THE LONGSOLID. ALL UNITS ARE OCCUPIED BY THE SPECIES
ddrumheller on DSK120RN23PROD with RULES2
[Area estimates reflect all land within critical habitat unit boundaries]
Critical habitat unit
(State)
Adjacent riparian land ownership by type
LS 1. French Creek (Pennsylvania) ..................
Public (Federal, State); ....................................
Private ..............................................................
LS 2. Allegheny River (Pennsylvania) ...............
Public (Federal, State); ....................................
Private ..............................................................
LS 3. Shenango River (Pennsylvania) ..............
Public (Federal, State); ....................................
Private ..............................................................
LS 4. Middle Island Creek (West Virginia) ........
Public (Local); ...................................................
Private ..............................................................
LS 5. Little Kanawha River (West Virginia) .......
Public (Federal, State); ....................................
Private ..............................................................
LS 6. Elk River (West Virginia) .........................
Public (Federal, State, Local); ..........................
Private ..............................................................
LS 7. Kanawha River (West Virginia) ...............
Public (Federal, State, Local); ..........................
Private ..............................................................
LS 8. Licking River (Kentucky) ..........................
Public (Federal, State, Local); ..........................
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14821
Approximate
river miles (kilometers)
14 (22.1)
106 (170.6)
Total = 120 (191.5)
84 (135.8)
15 (24.1)
Total = 99 (159.3)
7 (11.3)
15 (24.3)
Total = 22 (35.5)
0.13 (0.2)
14 (23.5)
Total = 14 (23.7)
0.53 (0.9)
122 (197.2)
Total = 123 (198)
7 (12.7)
93 (150.3)
Total = 101 (163)
2 (4.6)
18 (29.3)
Total = 21 (33.9)
19 (31.7)
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TABLE 2—CRITICAL HABITAT UNITS FOR THE LONGSOLID. ALL UNITS ARE OCCUPIED BY THE SPECIES—Continued
[Area estimates reflect all land within critical habitat unit boundaries]
Critical habitat unit
(State)
Approximate
river miles (kilometers)
Adjacent riparian land ownership by type
Private ..............................................................
161 (259.7)
Total = 181 (291.5)
51 (82.4)
105 (169.2)
Total = 156 (251.6)
Total = 48 (77.5)
17 (27.3)
160 (258.8)
Total = 177 (286.1)
56 (90.4)
2 (4.1)
Total = 58 (94.5)
LS 9. Green River (Kentucky) ...........................
Public (Federal, State, Local); ..........................
Private ..............................................................
LS 10. Cumberland River (Tennessee) ............
LS 11. Clinch River (Virginia and Tennessee) ..
Public (Federal) ................................................
Public (Federal, State); ....................................
Private ..............................................................
LS 12. Paint Rock River (Alabama) ..................
Public (Federal, State); ....................................
Private ..............................................................
Public ..........................................................
Private ........................................................
...........................................................................
...........................................................................
305 (491)
810 (1,304)
Total ....................................................
...........................................................................
1,115 (1,794)
Note: River miles may not sum due to rounding.
TABLE 3—CRITICAL HABITAT UNITS FOR THE ROUND HICKORYNUT. ALL UNITS ARE OCCUPIED BY THE SPECIES
ddrumheller on DSK120RN23PROD with RULES2
[Area estimates reflect all land within critical habitat unit boundaries]
Critical habitat unit
Adjacent riparian land ownership
by type
Approximate
river miles
(kilometers)
RH 1. Shenango River (Pennsylvania) ...................................
Public (Federal, State); ...........................................................
Private .....................................................................................
RH 2. Grand River (Ohio) ........................................................
Public (State, Local); ...............................................................
Private .....................................................................................
RH 3. Tippecanoe River (Indiana) ...........................................
Public (State, Easement); .......................................................
Private .....................................................................................
RH 4. Middle Island Creek (West Virginia) .............................
Public (Federal, State); ...........................................................
Private .....................................................................................
RH 5. Little Kanawha River (West Virginia) ............................
Public (Federal, State, Local); .................................................
Private .....................................................................................
RH 6. Elk River (West Virginia) ...............................................
Public (Federal, State, Local); .................................................
Private .....................................................................................
RH 7. Kanawha River (West Virginia) .....................................
Public (Federal, State, Local); .................................................
Private .....................................................................................
RH 8. Licking River (Kentucky) ...............................................
Public (Federal, State, Local); .................................................
Private .....................................................................................
RH 9. Rockcastle River (Kentucky) .........................................
Public (Federal); ......................................................................
Private .....................................................................................
RH 10. Buck Creek (Kentucky) ...............................................
Public (State, Local); ...............................................................
Private .....................................................................................
RH 11. Green River (Kentucky) ..............................................
Public (Federal, State); ...........................................................
Private .....................................................................................
RH 12. Paint Rock River (Alabama) .......................................
Public (Federal, State); ...........................................................
Private .....................................................................................
RH 13. Duck River (Tennessee) .............................................
Public (State, Local); ...............................................................
Private .....................................................................................
RH 14. Big Black River (Mississippi) .......................................
Private .....................................................................................
7 (11.1)
15 (24.3)
Total = 22 (35.5)
33 (53)
59 (95.2)
Total = 92 (148.2)
9 (14.5)
66 (105.6)
Total = 75 (120.8)
0.2 (0.4)
74.8 (120.4)
Total = 75 (120.8)
0.7 (1.2)
109 (175.4)
Total = 110
(176.6)
7 (12.7)
93 (150.3)
Total = 101 (163)
4 (7.2)
33 (53.2)
Total = 37.5 (60.4)
18 (30)
131 (211.8)
Total = 150
(241.9)
15 (24.2)
0.3 (0.4)
Total = 15.3 (24.6)
3 (5.5)
33 (52.6)
Total = 36 (58.1)
37 (59.4)
61 (98.4)
Total = 98 (157.7)
46 (73.4)
2 (4.1)
Total = 48 (77.5)
32 (51.1)
27 (43.7)
Total = 59 (94.8)
Total = 4 (7)
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14823
TABLE 3—CRITICAL HABITAT UNITS FOR THE ROUND HICKORYNUT. ALL UNITS ARE OCCUPIED BY THE SPECIES—
Continued
[Area estimates reflect all land within critical habitat unit boundaries]
Adjacent riparian land ownership
by type
Critical habitat unit
Approximate
river miles
(kilometers)
Public ................................................................................
Private ...............................................................................
..................................................................................................
..................................................................................................
212 (341)
709 (1,141)
Total ...........................................................................
..................................................................................................
921 (1,482)
Note: River miles may not sum due to rounding.
ddrumheller on DSK120RN23PROD with RULES2
We present brief descriptions of all
units, and reasons why they meet the
definition of critical habitat for the
longsolid and round hickorynut, below.
There are a total of 12 units for the
longsolid and 14 units for round
hickorynut, 8 of which overlap in part
or whole for both species, and all of
which contain all of the physical and
biological features essential to the
conservation of both species. Also, the
majority of units overlap in part or
whole with existing critical habitat
designated for other federally
endangered species (i.e., diamond darter
(Crystallaria cincotta), Short’s
bladderpod (Physaria globosa), purple
bean (Villosa perpurpurea), rough
rabbitsfoot (Quadrula cylindrica
strigillata), Cumberlandian combshell
(Epioblasma brevidens), oyster mussel
(Epioblasma capsaeformis), slabside
pearlymussel (Pleuronaia
(=Lexingtonia) dolabelloides), and
fluted kidneyshell (Ptychobranchus
subtentus)) or federally threatened
species (i.e., rabbitsfoot (Quadrula
cylindrica cylindrica), yellowfin
madtom (Noturus flavipinnis), and
slender chub (Erimystax (=Hybopsis)
cahni)), as specified below.
LS 1: French Creek
Unit LS 1 consists of 120 stream mi
(191.5 km) of French Creek in Crawford,
Erie, Mercer, and Venango Counties,
Pennsylvania, from Union City Dam
west of Union City, Erie County,
downstream to its confluence with the
Allegheny River near the City of
Franklin, Venango County. Riparian
lands that border the unit include
approximately 106 stream mi (170.6 km;
76 percent) in private ownership and 14
stream mi (22.1 km; 24 percent) in
public (Federal or State) ownership.
General land use on adjacent riparian
lands and the surrounding HUC 8-level
management unit includes agriculture,
several State-managed game lands, the
communities of Cambridge Springs and
Venango, and the cities of Meadville
and Franklin. Union City Dam is
operated by the U.S. Army Corps of
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Engineers. Unit LS 1 is occupied by the
species and contains all of the physical
or biological features essential to the
conservation of the species. The entire
120 stream mi (191.5 km) of this unit
overlap with designated critical habitat
for the federally threatened rabbitsfoot
mussel (80 FR 24692; April 30, 2015).
Threats identified within this unit
include the degradation of habitat and
water quality from impoundments,
siltation and pollution due to resource
extraction, agriculture, timbering
practices, and human development;
flow reduction and water quality
degradation due to water withdrawals
and wastewater treatment plants; and
the presence of invasive, nonnative
species. Special management
considerations or protection measures to
reduce or alleviate the threats may
include monitoring water quality
degradation within the species’ range
resulting from row crop agriculture and
oil and gas development, and efforts to
prevent the spread of invasive,
nonnative species, specifically the
round goby (see Special Management
Considerations or Protection, above).
LS 2: Allegheny River
Unit LS 2 consists of 99 river mi
(159.3 km) of the Allegheny River in
Warren, Crawford, Forest, Venango, and
Clarion Counties, Pennsylvania, from
Kinzua Dam east of Warren, Warren
County, downstream to the
Pennsylvania Route 58 crossing at
Foxburg, Clarion County, Pennsylvania.
Riparian lands that border the unit
include approximately 15 river mi (24.1
km; 14 percent) in private ownership
and 84 river mi (135.8 km; 86 percent)
in public (Federal or State government)
ownership. General land use on
adjacent riparian lands and the
surrounding HUC 8-level management
unit includes forestry, agriculture, and
State-managed game lands. The public
land ownership for this unit is a
combination of Allegheny National
Forest lands and State lands, and the
Kinzua Dam is operated by the U.S.
Army Corps of Engineers. Unit LS 2 is
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occupied by the species and contains all
of the physical or biological features
essential to the conservation of the
species. There is overlap of
approximately 35 river mi (57 km) of
this unit with designated critical habitat
for the federally threatened rabbitsfoot
mussel (80 FR 24692; April 30, 2015).
Threats identified within Unit LS 2
include the degradation of habitat and
water quality from impoundments,
channelization, siltation and pollution
due to improper timbering practices,
resource extraction, water withdrawals,
development, and wastewater treatment
plants, and the presence of invasive,
nonnative species. Special management
considerations or protection measures to
reduce or alleviate the threats may
include modifying dam releases from
Kinzua Dam to mimic the natural
hydrograph, improvements to water
quality to reverse degradation resulting
from row crop agriculture and oil and
gas development, and efforts to prevent
the spread of invasive, nonnative
species (see Special Management
Considerations or Protection, above).
LS 3: Shenango River
Unit LS 3 is the same as Unit RH 1,
described below for the round
hickorynut. Unit LS 3 consists of 22
river mi (35.5 km) of the Shenango River
in Crawford County, Pennsylvania, from
Pymatuning Dam downstream to the
point of inundation by Shenango River
Lake near Big Bend, Mercer County,
Pennsylvania. Riparian lands that
border the unit include approximately
15 river mi (24.3 km; 32 percent) in
private ownership and 7 river mi (11.3
km; 68 percent) in public (Federal or
State) ownership. General land use on
adjacent riparian lands and the
surrounding HUC 8-level management
unit includes the City of Greenville and
its associated industry, and the
unincorporated communities of
Jamestown and New Harrisburg.
Pymatuning Dam is owned by the State
of Pennsylvania. Unit LS 3 is occupied
by the species and contains all of the
physical or biological features essential
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to the conservation of the species. There
is overlap of approximately 14.5 river
mi (23.4 km) of this unit with
designated critical habitat for the
federally threatened rabbitsfoot mussel
(80 FR 24692; April 30, 2015).
Threats identified within Unit LS 3
include the degradation of habitat and
water quality from impoundments,
domestic and industrial pollution due to
human development, resource
extraction, water withdrawals, and
wastewater treatment plants, and the
presence of invasive, nonnative species.
Special management considerations or
protection measures to reduce or
alleviate the threats may include
modifying dam releases from
Pytmatuning Dam to mimic the natural
hydrograph, and efforts to prevent the
spread of invasive, nonnative species
(see Special Management
Considerations or Protection, above).
ddrumheller on DSK120RN23PROD with RULES2
LS 4: Middle Island Creek
Unit LS 4 partially overlaps with Unit
RH 4 for the round hickorynut,
described below. Unit LS 4 consists of
14 stream mi (23.7 km) of Middle Island
Creek in Doddridge and Tyler Counties,
West Virginia, from the mouth of
Meathouse Fork south of Smithburg,
Doddridge County, downstream to its
confluence with Arnold Creek at the
Tyler/Doddridge County line. Riparian
lands that border the unit include
approximately 14 stream mi (23.5 km;
99 percent) in private ownership and
0.13 river mi (0.2 km; less than 1
percent) in public (local government)
ownership. General land use on
adjacent riparian lands and the
surrounding HUC 8-level management
unit includes forestry and the
communities of Smithburg, Avondale,
and West Union. Unit LS 4 is occupied
by the species and contains all of the
physical or biological features essential
to the conservation of the species.
Threats identified within Unit LS 4
include degradation of habitat and water
quality from impoundments, siltation
and pollution due to improper
timbering practices, resource extraction,
water withdrawals, development, and
wastewater treatment plants, and the
presence of invasive, nonnative species.
Special management considerations or
protection measures to reduce or
alleviate the threats may include actions
to alleviate the threats of water quality
and habitat degradation from
hydrofracking wastewater discharges
and impoundments downstream on the
Ohio River, and efforts to prevent the
spread of invasive, nonnative species
(see Special Management
Considerations or Protection, above).
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LS 5: Little Kanawha River
Unit LS 5 partially overlaps with Unit
RH 5 for the round hickorynut,
described below. Unit LS 5 consists of
123 river mi (198 km) of the Little
Kanawha River in Calhoun, Gilmer,
Ritchie, and Wood Counties, West
Virginia, from Burnsville Dam (which is
in neighboring Braxton County)
downstream to its confluence with the
Ohio River in Parkersburg, Wood
County, West Virginia. Riparian lands
that border the unit include
approximately 122 river mi (197.2 km;
99 percent) in private ownership and
0.53 river mi (0.9 km; less than 1
percent) in public (Federal or State
government) ownership. General land
use on adjacent riparian lands and the
surrounding HUC 8-level management
unit includes forestry, agriculture,
industry, and numerous cities and
municipalities. Burnsville Dam is
operated by the U.S. Army Corps of
Engineers. Unit LS 5 is occupied by the
species and contains all of the physical
or biological features essential to the
conservation of the species.
Threats identified within Unit LS 5
include the degradation of habitat and
water quality from impoundments,
siltation and pollution due to improper
timbering practices, resource extraction,
water withdrawals, development, and
wastewater treatments plants, and the
presence of invasive, nonnative species.
Special management considerations or
protection measures to reduce or
alleviate the threats may include
modifying dam releases from Burnsville
Dam to mimic the natural hydrograph,
and efforts to prevent the spread of
invasive, nonnative species (see Special
Management Considerations or
Protection, above).
LS 6: Elk River
Unit LS 6 is the same as Unit RH 6,
described below for the round
hickorynut. Unit LS 6 consists of 101
river mi (163 km) of the Elk River in
Braxton, Clay, and Kanawha Counties,
West Virginia, from Sutton Dam in
Braxton County downstream to its
confluence with the Kanawha River at
Charleston, Kanawha County, West
Virginia. Riparian lands that border the
unit include approximately 93 river mi
(150.3 km; 92 percent) in private
ownership and 7 river mi (12.7 km; 8
percent) in public (Federal, State, and
local government) ownership. General
land use on adjacent riparian lands and
the surrounding HUC–8 level
management unit includes forestry,
agriculture, industry, and numerous
cities and municipalities. Sutton Dam is
operated by the U.S. Army Corps of
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Engineers. Unit LS 6 is occupied by the
species and contains all of the physical
or biological features essential to the
conservation of the species. There is
overlap of approximately 28 river mi
(44.6 km) of this unit with designated
critical habitat for the federally
endangered diamond darter (78 FR
52364; August 22, 2013).
Threats identified within Unit LS 6
include the degradation of habitat and
water quality from impoundments,
siltation and pollution due to improper
timbering practices, resource extraction,
water withdrawals, development, and
wastewater treatment plants, and the
presence of invasive, nonnative species.
Special management considerations or
protection measures to reduce or
alleviate the threats may include
modifying dam releases from Sutton
Dam to mimic the natural hydrograph
and efforts to prevent the spread of
invasive, nonnative species (see Special
Management Considerations or
Protection, above).
LS 7: Kanawha River
Unit LS 7 partially overlaps with Unit
RH 7 for the round hickorynut,
described below. Unit LS 7 consists of
21 river mi (33.9 km) of the Kanawha
River in Fayette and Kanawha Counties,
West Virginia, from Kanawha Falls in
Fayette County downstream to its
confluence with Cabin Creek at
Chelyan, Kanawha County, West
Virginia. Riparian lands that border the
unit include approximately 18 river mi
(29.3 km; 90 percent) in private
ownership and 2 river mi (4.6 km; 10
percent) in public (Federal, State, and
local government) ownership. General
land use on adjacent riparian lands and
the surrounding HUC 8-level
management unit includes forestry,
agriculture, industry, and numerous
cities and municipalities. London and
Marmet locks and dams within this unit
are operated by the U.S. Army Corps of
Engineers. Unit LS 7 is occupied by the
species and contains all of the physical
or biological features essential to the
conservation of the species.
Threats identified within Unit LS 7
include the degradation of habitat and
water quality from impoundments,
siltation and pollution due to improper
timbering practices, resource extraction,
water withdrawals, development, and
wastewater treatment plants, and the
presence of invasive, nonnative species.
Special management considerations or
protection measures to reduce or
alleviate the threats may include
riparian vegetation re-establishment in
addition to restoration efforts along
shorelines to minimize sediment and
contaminant inputs, and efforts to
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prevent the spread of invasive,
nonnative species (see Special
Management Considerations or
Protection, above).
ddrumheller on DSK120RN23PROD with RULES2
LS 8: Licking River
Unit LS 8 partially overlaps with Unit
RH 8 for the round hickorynut,
described below. Unit LS 8 consists of
181 river mi (291.5 km) of the Licking
River in Bath, Campbell, Fleming,
Harrison, Kenton, Morgan, Nicholas,
Pendleton, Robertson, and Rowan
Counties, Kentucky, from Cave Run
Dam in Bath/Rowan Counties
downstream to its confluence with the
Ohio River at Newport, Campbell/
Kenton County, Kentucky. Riparian
lands that border the unit include
approximately 161 river mi (259.7 km;
90 percent) in private ownership and 19
river mi (31.7 km; 10 percent) in public
(Federal, State, and local government)
ownership. General land use on
adjacent riparian lands and the
surrounding HUC 8-level management
unit includes forestry, agriculture
industry, and numerous cities and
municipalities. The Cave Run Dam is
operated by the U.S. Army Corps of
Engineers. Unit LS 8 is occupied by the
species and contains all of the physical
or biological features essential to the
conservation of the species.
Threats identified within Unit LS 8
include the degradation of habitat and
water quality from impoundments and
associated cold water discharges,
siltation and pollution due to improper
timbering practices, resource extraction,
water withdrawals, development, and
wastewater treatment plants, and the
presence of invasive, nonnative species.
Special management considerations or
protection measures to reduce or
alleviate the threats may include
modifying dam releases from Cave Run
Dam to mimic the natural hydrograph
and efforts to prevent the spread of
invasive, nonnative species (see Special
Management Considerations or
Protection, above).
LS 9: Green River
Unit LS 9 partially overlaps with Unit
RH 11 for the round hickorynut,
described below. Unit LS 9 consists of
156 river mi (251.6 km) of the Green
River in Butler/Warren, Edmonson,
Green, Hart, and Taylor Counties,
Kentucky, from Green River Lake Dam
south of Campbellsville in Taylor
County downstream to its confluence
with the Barren River at Woodbury,
Warren/Butler County, Kentucky.
Riparian lands that border the unit
include approximately 105 river mi
(169.2 km; 67 percent) in private
ownership and 51 river mi (82.4 km; 33
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percent) in public (Federal, State, and
local government) ownership; Federal
lands include a portion of Mammoth
Cave National Park. General land use on
adjacent riparian lands and the
surrounding HUC 8-level management
unit includes forestry, agriculture,
industry, and numerous cities and
municipalities, and Green River Lake
Dam is operated by the U.S. Army Corps
of Engineers. Unit LS 9 is occupied by
the species and contains all of the
physical or biological features essential
to the conservation of the species. The
entire approximately 156-river-mi (252km) unit overlaps with designated
critical habitat for the federally
endangered diamond darter (78 FR
52364; August 22, 2013) and the
federally threatened rabbitsfoot mussel
(80 FR 24692; April 30, 2015).
Threats identified within Unit LS 9
include the degradation of habitat and
water quality from impoundments and
associated cold water discharges,
siltation and pollution due to improper
timbering and agricultural practices,
resource extraction, water withdrawals,
and development, all of which affect
channel stability; wastewater treatment
plants; and the presence of invasive,
nonnative species. Special management
considerations or protection measures
may be needed to reduce or alleviate
habitat degradation such as
channelization and channel instability.
Additional special management
considerations or protection measures
may be needed to address thermal and
flow regimes associated with tail water
releases from the Green River Lake Dam,
and efforts to prevent the spread of
invasive, nonnative species (see Special
Management Considerations or
Protection, above).
LS 10: Cumberland River
Unit LS 10 consists of 48 river mi
(77.5 km) of the Cumberland River in
Smith, Trousdale, and Wilson Counties,
Tennessee, from Cordell Hull Dam north
of Carthage in Smith County
downstream to reservoir influence of
Old Hickory Reservoir at U.S. Route 231
north of Lebanon, Wilson County,
Tennessee. Riparian lands that border
the unit are all public (Federal)
ownership. General land use on
adjacent riparian lands and the
surrounding HUC 8-level management
unit includes forestry, agriculture, and
the municipalities of Carthage and
Rome, Tennessee; both Cordell Hull and
Old Hickory Dams upstream and
downstream of this unit are operated by
the U.S. Army Corps of Engineers. Unit
LS 10 is occupied by the species and
contains all of the physical or biological
features essential to the conservation of
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14825
the species. There is overlap of
approximately 1 river mi (1.7 km) of this
unit with designated critical habitat for
the federally endangered Short’s
bladderpod (79 FR 50990; August 26,
2014).
Threats identified within Unit LS 10
include the degradation of habitat and
water quality from upstream and
downstream impoundments and
associated cold water discharges,
siltation and pollution due to improper
timbering practices, resource extraction,
water withdrawals, development, and
wastewater treatment plants, and the
presence of invasive, nonnative species.
Special management considerations or
protection measures to reduce or
alleviate the threats may include
channel stability, thermal regimes,
altered flow regimes associated with tail
water releases from Cordell Hull
Reservoir, actions to address
channelization, and efforts to prevent
the spread of invasive, nonnative
species (see Special Management
Considerations or Protection, above).
LS 11: Clinch River
Unit LS 11 consists of 177 river mi
(286.1 km) of the Clinch River in
Russell, Scott, Tazewell, and Wise
Counties in Virginia, and Claiborne,
Hancock, and Hawkins Counties in
Tennessee. This unit extends from
Secondary Highway 637 west of
Pounding Mill in Tazewell County,
Virginia, downstream to County
Highway 25, Claiborne County,
Tennessee, northwest of Thorn Hill. The
Tennessee portion of this unit is also
encompassed by the Tennessee Wildlife
Resources Agency’s Clinch River
Sanctuary. Riparian lands that border
the unit include approximately 160
river mi (258.8 km; 90 percent) in
private ownership and 17 river mi (27.3
km; 10 percent) in public (Federal and
State) ownership. General land use on
adjacent riparian lands and the
surrounding HUC 8-level management
unit includes forestry, agriculture,
industry, and numerous cities and
municipalities. Unit LS 11 is occupied
by the species and contains all of the
physical or biological features essential
to the conservation of the species. There
is overlap of approximately 171 river mi
(274.4 km) of this unit with designated
critical habitat for the federally
endangered purple bean, oyster mussel,
rough rabbitsfoot, and Cumberlandian
combshell (69 FR 53136; August 31,
2004); the federally endangered slabside
pearlymussel and fluted kidneyshell (78
FR 59556; September 26, 2013); and
with the federally threatened yellowfin
madtom and slender chub (42 FR 45526;
September 9, 1977).
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Threats identified within Unit LS 11
include the degradation of habitat and
water quality from downstream
impoundment, mining discharges,
siltation and pollution due to improper
timbering practices, resource extraction,
water withdrawals, development, and
wastewater treatment plants, and the
presence of invasive, nonnative species.
Special management considerations or
protection measures to reduce or
alleviate the threats may include
management of the Norris Reservoir
downstream to provide additional
riverine habitat, and efforts to prevent
the spread of invasive, nonnative
species (see Special Management
Considerations or Protection, above).
LS 12: Paint Rock River
Unit LS 12 partially overlaps with
Unit RH 12 for the round hickorynut,
described below. Unit LS 12 consists of
58 river mi (94.5 km) of the Paint Rock
River in Jackson and Madison/Marshall
Counties, Alabama, from the confluence
of Hurricane Creek and Estill Fork in
Jackson County, Alabama, downstream
to its confluence with the Tennessee
River west of Hebron, Madison/Marshall
County, Alabama. Riparian lands that
border the unit include approximately 2
river mi (4.1 km; 3 percent) in private
ownership and 56 river mi (90.4 km; 97
percent) in public (Federal and State)
ownership. General land use on
adjacent riparian lands and the
surrounding HUC 8-level management
unit includes forestry, agriculture, and
several small municipalities (Princeton,
Hollytree, Trenton, and Paint Rock).
Unit LS 12 is occupied by the species
and contains all of the physical or
biological features essential to the
conservation of the species. There is
overlap of approximately 53 river mi (85
km) of this unit with designated critical
habitat for the federally endangered
slabside pearlymussel (78 FR 59556;
September 26, 2013) and the federally
threatened rabbitsfoot mussel (80 FR
24692; April 30, 2015).
Threats identified within Unit LS 12
include the degradation of habitat and
water quality from downstream
impoundment, siltation and pollution
due to improper agricultural and
timbering practices, resource extraction,
water withdrawals, development, and
wastewater treatment plants, and the
presence of invasive, nonnative species.
Special management considerations or
protection measures to reduce or
alleviate the threats may include
management of Wheeler Reservoir
downstream to provide additional
riverine habitat, working with
landowners to implement BMPs to
reduce erosion and sedimentation
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associated with agricultural lands, and
efforts to prevent the spread of invasive,
nonnative species (see Special
Management Considerations or
Protection, above).
RH 1: Shenango River
Unit RH 1 is the same as Unit LS 3
for the longsolid, described above. It
consists of 22 river mi (35.5 km) of the
Shenango River in Crawford County,
Pennsylvania, from Pymatuning Dam
downstream to the point of inundation
by Shenango River Lake near Big Bend,
Mercer County, Pennsylvania. Riparian
lands that border the unit include
approximately 15 river mi (24.3 km; 32
percent) in private ownership and 7
river mi (11.1 km; 68 percent) in public
(Federal or State) ownership. General
land use on adjacent riparian lands and
the surrounding HUC 8-level
management unit includes the City of
Greenville and its associated industry,
and the unincorporated communities of
Jamestown and New Harrisburg.
Pymatuning Dam is owned by the State
of Pennsylvania. Unit RH 1 is occupied
by the species and contains all of the
physical or biological features essential
to the conservation of the species. There
is overlap of approximately 14.5 river
mi (23.4 km) of this unit with
designated critical habitat for the
federally threatened rabbitsfoot mussel
(80 FR 24692; April 30, 2015).
Threats identified within Unit RH 1
include the degradation of habitat and
water quality from impoundments,
domestic and industrial pollution due to
human development, resource
extraction, water withdrawals, and
wastewater treatment plants, and the
presence of invasive, nonnative species.
Special management considerations or
protection measures to reduce or
alleviate the threats may include
modifying dam releases from
Pytmatuning Dam to mimic the natural
hydrograph, and efforts to prevent the
spread of invasive, nonnative species
(see Special Management
Considerations or Protection, above).
RH 2: Grand River
Unit RH 2 consists of 92 river mi
(148.2 km) of the Grand River in
Ashtabula, Lake, and Trumbull
Counties, Ohio, from the Trumbull/
Geauga County line south of Lake
County, Ohio State Route 88,
downstream to the mouth of the Grand
River at its confluence with Lake Erie.
Riparian lands that border the unit
include approximately 59 river mi (95.2
km; 64 percent) in private ownership
and 33 river mi (53 km; 36 percent) in
public (State and local government)
ownership. The Grand River is a State
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Wild and Scenic River, with a ‘‘Wild
River’’ designation for approximately 23
river mi (37 km) from the Harpersfield
Covered Bridge downstream to the
Norfolk and Western Railroad Trestle in
Lake County, and ‘‘Scenic River’’
designation for approximately 33 river
mi (53 km) from the U.S. 322 Bridge in
Ashtabula County downstream to the
Harpersfield Covered Bridge. General
lands use on adjacent riparian lands and
the surrounding HUC 8-level
management unit includes forestry,
agriculture, and several municipalities
(West Farmington, Windsor, Rock
Creek, and Perry). Harpersfield Dam is
operated by the U.S. Army Corps of
Engineers. Unit RH 2 is occupied by the
species and contains all of the physical
or biological features essential to the
conservation of the species.
Threats identified within Unit RH 2
include degradation of habitat and water
quality from impoundments, domestic
and industrial pollution due to human
development, resource extraction, water
withdrawals, and wastewater treatment
plants, and the presence of invasive,
nonnative species. Special management
considerations or protection measures to
reduce or alleviate the threats may
include modifying dam releases from
the Harpersfield Dam to mimic the
natural hydrograph, and efforts to
prevent the spread of invasive,
nonnative species (see Special
Management Considerations or
Protection, above).
RH 3: Tippecanoe River
Unit RH 3 consists of 75 river mi
(120.8 km) of the Tippecanoe River in
Fulton, Marshall, Pulaski, and Starke
Counties, Indiana, from the railroad
crossing west of the communities of
Tippecanoe, Marshall County,
downstream to the Pulaski/White
County line, southwest of the
community of Star City, Indiana.
Riparian lands that border the unit
include approximately 66 river mi
(105.6 km; 89 percent) in private
ownership and 9 river mi (14.5 km; 11
percent) in public ownership. General
land use on adjacent riparian lands and
the surrounding HUC 8-level
management unit includes agriculture
and the communities of Tippecanoe,
Pershing, and Ora. Unit RH 3 is
occupied by the species and contains all
of the physical or biological features
essential to the conservation of the
species. There is overlap of
approximately 19 river mi (29.9 km) of
this unit with designated critical habitat
for the federally threatened rabbitsfoot
mussel (80 FR 24692; April 30, 2015).
Threats identified within Unit RH 3
include the degradation of habitat and
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water quality from impoundments,
domestic and industrial pollution due to
human development, resource
extraction, water withdrawals, and
wastewater treatment plants, and the
presence of invasive, nonnative species.
Special management considerations or
protection measures to reduce or
alleviate the threats may include
modifying operations of downstream
impoundments to provide additional
riverine habitats, and efforts to prevent
the spread of invasive, nonnative
species (see Special Management
Considerations or Protection, above).
ddrumheller on DSK120RN23PROD with RULES2
RH 4: Middle Island Creek
Unit RH 4 partially overlaps with Unit
LS 4 for the longsolid, described above.
Unit RH 4 consists of 75 stream mi
(120.8 km) of the Middle Island Creek
in Doddridge, Pleasants, and Tyler
Counties, West Virginia, from the Tyler/
Doddridge County line northeast of
Deep Valley downstream to the
confluence with the Ohio River, at St.
Mary’s, Pleasants County, West Virginia.
Riparian lands that border the unit
include approximately 74.8 stream mi
(120.4 km; 99 percent) in private
ownership and 0.2 stream mi (0.4 km;
less than 1 percent) in public (Federal
and State) ownership. General land use
on adjacent riparian lands and the
surrounding HUC 8-level management
unit includes the communities of
Smithburg, Avondale, West Union,
Alma, and Centerville. Unit RH 4 is
occupied by the species and contains all
of the physical or biological features
essential to the conservation of the
species.
Threats identified within Unit RH 4
include the degradation of habitat and
water quality from siltation and
pollution due to improper timbering
practices, resource extraction, water
withdrawals, development, and
wastewater treatment plants, and the
presence of invasive, nonnative species.
Special management considerations or
protection measures to reduce or
alleviate the threats may include
monitoring hydrofracking wastewater
discharges and impoundments
downstream on the Ohio River, and
implementing efforts to prevent the
spread of invasive, nonnative species
(see Special Management
Considerations or Protection, above).
RH 5: Little Kanawha River
Unit RH 5 partially overlaps with Unit
LS 5 for the longsolid, also described
above. Unit RH 5 consists of 110 river
mi (176.6 km) of the Little Kanawha
River in Calhoun, Gilmer, Ritchie, and
Wood Counties, West Virginia, from
Burnsville Dam (which is in
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neighboring Braxton County)
downstream to West Virginia Route 47
at Parkersburg, Wood County, West
Virginia. Riparian lands that border the
unit include approximately 109 river mi
(175.4 km; 99 percent) in private
ownership and 0.7 river mi (1.2 km; 1
percent) in public (Federal, State, and
local government) ownership. General
land use on adjacent riparian lands and
the surrounding HUC 8-level
management unit includes forestry,
agriculture, industry, and numerous
cities and municipalities. Burnsville
Dam is operated by the U.S. Army Corps
of Engineers. Unit RH 5 is occupied by
the species and contains all of the
physical or biological features essential
to the conservation of the species.
Threats identified within Unit RH 5
include the degradation of habitat from
impoundments, siltation and pollution
due to improper timbering practices,
resource extraction, water withdrawals,
development, and wastewater treatment
plants, and the presence of invasive,
nonnative species. Special management
considerations or protection measures to
reduce or alleviate the threats may
include modifying dam releases from
Burnsville Dam to mimics the natural
hydrograph, and efforts to prevent the
spread of invasive, nonnative species
(see Special Management
Considerations or Protection, above).
RH 6: Elk River
Unit RH 6 is the same as Unit LS 6
for the longsolid, described above. Unit
RH 6 consists of 101 river mi (163 km)
of the Elk River in Braxton, Clay, and
Kanawha Counties, West Virginia, from
the Sutton Dam in Braxton County
downstream to its confluence with the
Kanawha River at Charleston, Kanawha
County, West Virginia. Riparian lands
that border the unit include
approximately 93 river mi (150.3 km; 92
percent) in private ownership and 7
river mi (12.7 km; 8 percent) in public
(Federal, State, and local government)
ownership. General land use on
adjacent riparian lands and the
surrounding HUC 8-level management
unit includes forestry, agriculture,
industry, and numerous cities and
municipalities. Sutton Dam is operated
by the U.S. Army Corps of Engineers.
Unit RH 6 is occupied by the species
and contains all of the physical or
biological features essential to the
conservation of the species. There is
overlap of approximately 28 river mi
(44.6 km) of this unit with the
designated critical habitat for the
federally endangered diamond darter
(78 FR 52364; August 22, 2013).
Threats identified within Unit RH 6
include the degradation of habitat and
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14827
water quality from impoundments,
siltation and pollution due to improper
timbering practices, resource extraction,
water withdrawals, development, and
wastewater treatment plants, and the
presence of invasive, nonnative species.
Special management considerations or
protection measures to reduce or
alleviate the threats may include
modifying dam releases from Sutton
Dam to mimic the natural hydrograph,
and efforts to prevent the spread of
invasive, nonnative species (see Special
Management Considerations or
Protection, above).
RH 7: Kanawha River
Unit RH 7 partially overlaps with Unit
LS 7 for the longsolid, described above.
Unit RH 7 consists of 37.5 river mi (60.4
km) of the Kanawha River in Fayette
and Kanawha Counties, West Virginia,
from Kanawha Falls in Fayette County
downstream to its confluence with the
Elk River at Charleston, Kanawha
County, West Virginia. Riparian lands
that border the unit include
approximately 33 river mi (53.2 km; 90
percent) in private ownership and 4
river mi (7.2 km; 10 percent) in public
(Federal, State, and local government)
ownership. General land use on
adjacent riparian lands and the
surrounding HUC 8-level management
unit includes forestry, agriculture,
industry, and numerous cities and
municipalities. London and Marmet
locks and dams within this unit are
operated by the U.S. Army Corps of
Engineers. Unit RH 7 is occupied by the
species and contains all of the physical
or biological features essential to the
conservation of the species.
Threats identified within Unit RH 7
include the degradation of habitat and
water quality from impoundments,
siltation and pollution due to improper
timbering practices, resource extraction,
water withdrawals, development, and
wastewater treatment plants, and the
presence of invasive, nonnative species.
Special management considerations or
protection measures to reduce or
alleviate the threats may include
riparian vegetation re-establishment in
addition to restoration efforts along
shorelines to minimize sediment and
contaminant inputs, and efforts to
prevent the spread of invasive,
nonnative species (see Special
Management Considerations or
Protection, above).
RH 8: Licking River
Unit RH 8 partially overlaps with Unit
LS 8 for the longsolid, described above.
Unit RH 8 consists of 150 mi (241.9 km)
of the Licking River in Bath, Campbell,
Fleming, Harrison, Kenton, Morgan,
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ddrumheller on DSK120RN23PROD with RULES2
Nicholas, Pendleton, Robertson, and
Rowan Counties, Kentucky, from Cave
Run Dam in Bath/Rowan Counties
downstream to the Railroad crossing at
the Campbell/Kenton/Pendleton County
line at De Mossville, northwest of
Butler, Pendleton County, Kentucky.
Riparian lands that border the unit
include approximately 131 river mi
(211.8 km; 87 percent) in private
ownership and 18 river mi (30 km; 13
percent) in public (Federal, State, and
local government) ownership. General
land use on adjacent riparian lands and
the surrounding HUC 8-level
management unit includes forestry,
agriculture industry, and numerous
cities and municipalities. Cave Run
Dam is operated by the U.S. Army Corps
of Engineers. Unit RH 8 is occupied by
the species and contains all of the
physical or biological features essential
to the conservation of the species.
Threats identified within Unit RH 8
include the degradation of habitat and
water quality from impoundments and
associated cold water discharges,
siltation and pollution due to improper
timbering practices, resource extraction,
water withdrawals, development, and
wastewater treatment plants, and the
presence of invasive, nonnative species.
Special management considerations or
protection measures to reduce or
alleviate the threats may include
modifying dam releases from Cave Run
Dam to mimic the natural hydrograph,
and efforts to prevent the spread of
invasive, nonnative species (see Special
Management Considerations or
Protection, above).
RH 9: Rockcastle River
Unit RH 9 consists of 15.3 river mi
(24.6 km) of the Rockcastle River in
Laurel, Pulaski, and Rockcastle
Counties, Kentucky, from Kentucky
Route 1956 at Billows downstream to
Kentucky Route 192, near its confluence
with Cane Creek along the Laurel/
Pulaski County line, northwest of
Baldrock, Laurel County, Kentucky.
Riparian lands that border the unit
include approximately 0.3 river mi (0.4
km; less than 1 percent) in private
ownership and 15 river mi (24.2 km; 99
percent) in public (Federal) ownership.
Federal ownership is the Daniel Boone
National Forest. General land use on
adjacent riparian lands and the
surrounding HUC 8-level management
unit is predominantly forestry. Unit RH
9 is occupied by the species and
contains all of the physical or biological
features essential to the conservation of
the species. There is overlap of
approximately 15 river mi (23.7 km) of
this unit with designated critical habitat
for the federally endangered fluted
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kidneyshell (78 FR 59556; September
26, 2013).
Threats identified within Unit RH 9
include the degradation of habitat and
water quality from siltation and
pollution due to improper timbering
practices and resource extraction, and
the presence of invasive, nonnative
species. Special management
considerations or protection measures to
reduce or alleviate the threats may
include management of Lake
Cumberland, located downstream, to
provide more riverine habitat upstream,
and efforts to prevent the spread of
invasive, nonnative species (see Special
Management Considerations or
Protection, above).
RH 10: Buck Creek
Unit RH 10 consists of 36 stream mi
(58.1 km) of Buck Creek in Pulaski
County, Kentucky, from its confluence
with Glade Fork Creek northeast of
Goochtown, downstream to its
confluence with Whetstone Creek,
northeast of Dykes, Pulaski County,
Kentucky. Riparian lands that border
the unit include approximately 33
stream mi (52.6 km; 92 percent) in
private ownership and 3 stream mi (5.5
km; 8 percent) in public (State and local
government) ownership. General land
use on adjacent riparian lands and the
surrounding HUC 8-level management
unit includes forestry, agriculture, and
several small communities. Unit RH 10
is occupied by the species and contains
all of the physical or biological features
essential to the conservation of the
species. There is overlap of
approximately 35 stream mi (56.7 km)
with designated critical habitat for the
federally endangered Cumberlandian
combshell and oyster mussel (69 FR
53136; August 31, 2004), and the
federally endangered fluted kidneyshell
(78 FR 59556; September 26, 2013).
Threats identified within Unit RH 10
include the degradation of habitat and
water quality from instream gravel
mining, forest clearing activities, illegal
off-road vehicle use, nonpoint source
pollution from agriculture, and
development activities, and the
presence of invasive, nonnative species.
Special management considerations or
protection measures to reduce or
alleviate the threats may include
management of Lake Cumberland,
located downstream, to provide more
riverine habitat upstream, and efforts to
prevent the spread of invasive,
nonnative species (see Special
Management Considerations or
Protection, above).
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RH 11: Green River
Unit RH 11 partially overlaps with
Unit LS 9 for the longsolid, described
above. Unit RH 11 consists of 98 river
mi (157.7 km) of the Green River in
Butler/Warren, Edmonson, Green, and
Hart Counties, Kentucky, from the
mouth of Lynn Camp Creek east of
Linwood in Hart County downstream to
its confluence with the Barren River at
Woodbury, Warren/Butler Counties,
Kentucky. Riparian lands that border
the unit include approximately 61 river
mi (98.4 km; 62 percent) in private
ownership and 37 river mi (59.4 km; 38
percent) in public (Federal and State)
ownership; Federal lands include a
portion of Mammoth Cave National
Park. General land use on adjacent
riparian lands and the surrounding HUC
8-level management unit includes
forestry, agriculture, industry, and
numerous cities and municipalities, and
Green River Lake Dam (located
upstream of this unit) is operated by the
U.S. Army Corps of Engineers. Unit RH
11 is occupied by the species and
contains all of the physical or biological
features essential to the conservation of
the species. The entire 98-river-mi
(157.7-km) unit overlaps with
designated critical habitat for the
federally endangered diamond darter
(78 FR 52364; August 22, 2013) and the
federally threatened rabbitsfoot mussel
(80 FR 24692; April 30, 2015).
Threats identified within Unit RH 11
include the degradation of habitat and
water quality from Green River Lake
Dam and associated cold water
discharges, siltation and pollution due
to improper timbering and agricultural
practices, resource extraction, water
withdrawals, and development, all of
which affect channel stability;
wastewater treatment plants; and the
presence of invasive, nonnative species.
Special management considerations or
protection measures may be needed to
reduce or alleviate habitat degradation
such as channelization and channel
instability. Additional special
management considerations or
protection measures may be needed to
address thermal and flow regimes
associated with tail water releases from
the Green River Lake Dam, and efforts
to prevent the spread of invasive,
nonnative species (see Special
Management Considerations or
Protection, above).
RH 12: Paint Rock River
Unit RH 12 partially overlaps with
Unit LS 12 for the longsolid, described
above. Unit RH 12 consists of 48 river
mi (77.5 km) of the Paint Rock River in
Jackson and Madison/Marshall
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Counties, Alabama, from the confluence
of Hurricane Creek and Estill Fork in
Jackson County, Alabama, downstream
to U.S. Route 431, south of New Hope,
Madison/Marshall Counties, Alabama.
Riparian lands that border the unit
include approximately 2 river mi (4.1
km; 2 percent) in private ownership and
46 river mi (73.4 km; 98 percent) in
public (Federal and State) ownership.
General land use on adjacent riparian
lands and the surrounding HUC 8-level
management unit includes forestry,
agriculture, and several small
municipalities (Princeton, Hollytree,
Trenton, and Paint Rock). Unit RH 12 is
occupied by the species and contains all
of the physical or biological features
essential to the conservation of the
species. The entire approximately 48river-mi (77.5-km) unit overlaps with
designated critical habitat for the
federally endangered slabside
pearlymussel (78 FR 59556; September
26, 2013), and the federally threatened
rabbitsfoot mussel (80 FR 24692; April
30, 2015).
Threats identified within Unit RH 12
include the degradation of habitat and
water quality from impoundments,
siltation and pollution due to improper
timbering practices, resource extraction,
water withdrawals, development, and
wastewater treatment plants, and the
presence of invasive, nonnative species.
Special management considerations or
protection measures to reduce or
alleviate the threats may include
management of Wheeler Reservoir
downstream to provide additional
riverine habitat, working with
landowners to implement BMPs to
reduce erosion and sedimentation
associated with agricultural lands, and
efforts to prevent the spread of invasive,
nonnative species (see Special
Management Considerations or
Protection, above).
RH 13: Duck River
Unit RH 13 consists of 59 river mi
(94.8 km) of the Duck River in Bedford,
Marshall, and Maury Counties,
Tennessee, from its confluence with
Sinking Creek in Bedford County,
downstream to the mouth of Goose
Creek, east of Columbia, Maury County,
Tennessee. Riparian lands that border
the unit include approximately 27 river
mi (43.7 km; 47 percent) in private
ownership and 32 river mi (51.1 km; 53
percent) in public (State and local
government) ownership. General land
use on adjacent riparian lands and the
surrounding HUC 8-level management
unit includes forestry, agriculture, and
several municipalities (Milltown,
Leftwich, and Philadelphia). Normandy
Dam is operated by the Tennessee
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Valley Authority. Unit RH 13 is
occupied by the species and contains all
of the physical or biological features
essential to the conservation of the
species. There is overlap of
approximately 55 river mi (88.9 km) of
this unit with designated critical habitat
for the federally endangered slabside
pearlymussel and fluted kidneyshell (78
FR 59556; September 26, 2013), and the
federally endangered Cumberlandian
combshell and oyster mussel (69 FR
53136; August 31, 2004).
Threats identified within Unit RH 13
include the degradation of habitat and
water quality from impoundments,
siltation and pollution due to improper
timbering practices, agricultural
activities (livestock), row crop
agriculture and channelization, resource
extraction, water withdrawals, and
wastewater treatment plants, and the
presence of invasive, nonnative species.
Special management considerations or
protection measures to reduce or
alleviate the threats may include
seasonally adjusted flow regimes
associated with tail water releases from
Normandy Dam, working with
landowners to implement BMPs to
reduce erosion and sedimentation
associated with agricultural lands,
planting adequate riparian buffers to
minimize agriculture impacts, and
implementing efforts to prevent the
spread of invasive, nonnative species
(see Special Management
Considerations or Protection, above).
RH 14: Big Black River
Unit RH 14 consists of 4 river mi (7
km) of the Big Black River in
Montgomery County, Mississippi, from
its confluence with Poplar Creek in
Montgomery County, downstream to its
confluence with Lewis Creek,
Mississippi. Riparian lands that border
the unit are all (100 percent) in private
ownership. General land use on
adjacent riparian lands and the
surrounding HUC 8-level management
unit is predominantly agricultural
activities. Unit RH 14 is occupied by the
species and contains all of the physical
or biological features essential to the
conservation of the species.
Threats identified within Unit RH 14
include degradation of habitat and water
quality from impoundments, siltation
and pollution due to improper
agricultural activities, row crop
agriculture and channelization, and
water withdrawals, and the presence of
invasive, nonnative species. Special
management considerations or
protection measures to reduce or
alleviate the threats may include
working with landowners to implement
BMPs to reduce erosion and
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sedimentation associated with
agricultural lands and water quality
degradation, and efforts to prevent the
spread of invasive, nonnative species
(see Special Management
Considerations or Protection, above).
Effects of Critical Habitat Designation
Section 7
Consultation
Section 7(a)(2) of the Act requires
Federal agencies, including the Service,
to ensure that any action they fund,
authorize, or carry out is not likely to
jeopardize the continued existence of
any endangered species or threatened
species or result in the destruction or
adverse modification of designated
critical habitat of such species.
We published a final rule revising the
definition of destruction or adverse
modification on August 27, 2019 (84 FR
44976). Destruction or adverse
modification means a direct or indirect
alteration that appreciably diminishes
the value of critical habitat as a whole
for the conservation of a listed species.
If a Federal action may affect a listed
species or its critical habitat, the
responsible Federal agency (action
agency) must enter into consultation
with us. Examples of actions that are
subject to the section 7 consultation
process are actions on State, Tribal,
local, or private lands that require a
Federal permit (such as a permit from
the U.S. Army Corps of Engineers under
section 404 of the Clean Water Act (33
U.S.C. 1251 et seq.) or a permit from the
Service under section 10 of the Act) or
that involve some other Federal action
(such as funding from the Federal
Highway Administration, Federal
Aviation Administration, or the Federal
Emergency Management Agency).
Federal actions not affecting listed
species or critical habitat, and actions
on State, Tribal, local, or private lands
that are not federally funded,
authorized, or carried out by a Federal
agency—do not require section 7
consultation.
Compliance with the requirements of
section 7(a)(2) is documented through
our issuance of:
(1) A concurrence letter for Federal
actions that may affect, but are not
likely to adversely affect, listed species
or critical habitat; or
(2) A biological opinion for Federal
actions that may affect, and are likely to
adversely affect, listed species or critical
habitat.
When we issue a biological opinion
concluding that a project is likely to
jeopardize the continued existence of a
listed species and/or destroy or
adversely modify critical habitat, we
provide reasonable and prudent
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alternatives to the project, if any are
identifiable, that would avoid the
likelihood of jeopardy and/or
destruction or adverse modification of
critical habitat. We define ‘‘reasonable
and prudent alternatives’’ (at 50 CFR
402.02) as alternative actions identified
during consultation that:
(1) Can be implemented in a manner
consistent with the intended purpose of
the action,
(2) Can be implemented consistent
with the scope of the Federal agency’s
legal authority and jurisdiction,
(3) Are economically and
technologically feasible, and
(4) Would, in the Service Director’s
opinion, avoid the likelihood of
jeopardizing the continued existence of
the listed species and/or avoid the
likelihood of destroying or adversely
modifying critical habitat.
Reasonable and prudent alternatives
can vary from slight project
modifications to extensive redesign or
relocation of the project. Costs
associated with implementing a
reasonable and prudent alternative are
similarly variable.
Regulations at 50 CFR 402.16 set forth
requirements for Federal agencies to
reinitiate formal consultation on
previously reviewed actions. These
requirements apply when the Federal
agency has retained discretionary
involvement or control over the action
(or the agency’s discretionary
involvement or control is authorized by
law) and, subsequent to the previous
consultation: (1) if the amount or extent
of taking specified in the incidental take
statement is exceeded; (2) if new
information reveals effects of the action
that may affect listed species or critical
habitat in a manner or to an extent not
previously considered; (3) if the
identified action is subsequently
modified in a manner that causes an
effect to the listed species or critical
habitat that was not considered in the
biological opinion or written
concurrence; or (4) if a new species is
listed or critical habitat designated that
may be affected by the identified action.
In such situations, Federal agencies
sometimes may need to request
reinitiation of consultation with us, but
Congress also enacted some exceptions
in 2018 to the requirement to reinitiate
consultation on certain land
management plans on the basis of a new
species listing or new designation of
critical habitat that may be affected by
the subject Federal action. See 2018
Consolidated Appropriations Act,
Public Law 115–141, Div, O, 132 Stat.
1059 (2018).
Overall, and as stated above under
Final Critical Habitat Designation, the
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majority of units overlap in part or
whole with existing critical habitat
designated for other federally
endangered aquatic species (i.e.,
diamond darter, Short’s bladderpod,
purple bean, rough rabbitsfoot,
Cumberlandian combshell, oyster
mussel, slabside pearlymussel, and
fluted kidneyshell) or federally
threatened aquatic species (i.e.,
rabbitsfoot, yellowfin madtom, and
slender chub). The conservation
measures we would recommend for the
longsolid and round hickorynut are
likely to be the same or very similar to
those we already recommend for these
other listed aquatic species.
Application of the ‘‘Adverse
Modification’’ Standard
The key factor related to the
destruction or adverse modification
determination is whether
implementation of the proposed Federal
action directly or indirectly alters the
designated critical habitat in a way that
appreciably diminishes the value of the
critical habitat as a whole for the
conservation of the listed species. As
discussed above, the role of critical
habitat is to support physical or
biological features essential to the
conservation of a listed species and
provide for the conservation of the
species.
Section 4(b)(8) of the Act requires us
to briefly evaluate and describe, in any
proposed or final regulation that
designates critical habitat, activities
involving a Federal action that may
violate section 7(a)(2) of the Act by
destroying or adversely modifying such
habitat, or that may be affected by such
designation.
Activities that we may, during a
consultation under section 7(a)(2) of the
Act, consider likely to destroy or
adversely modify critical habitat
include, but are not limited to actions
that would: (1) Alter the geomorphology
of their stream and river habitats (e.g.,
instream excavation or dredging,
impoundment, channelization, sand and
gravel mining, clearing riparian
vegetation, and discharge of fill
materials); (2) significantly alter the
existing flow regime where these
species occur (e.g., impoundment, urban
development, water diversion, water
withdrawal, water draw-down, and
hydropower generation); (3)
significantly alter water chemistry or
water quality (e.g., hydropower
discharges, or the release of chemicals,
biological pollutants, or heated effluents
into surface water or connected
groundwater at a point source or by
dispersed release (nonpoint source));
and (4) significantly alter stream bed
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material composition and quality by
increasing sediment deposition or
filamentous algal growth (e.g.,
construction projects, gravel and sand
mining, oil and gas development, coal
mining, livestock grazing, timber
harvest, and other watershed and
floodplain disturbances that release
sediments or nutrients into the water).
Consulting agencies and such activities
could include, but are not limited to:
(1) U.S. Army Corps of Engineers
(channel dredging and maintenance;
dam projects including flood control,
navigation, hydropower, and water
supply; and Clean Water Act permitting
including bridge projects and stream
restoration activities).
(2) U.S. Department of Agriculture,
including the Natural Resources
Conservation Service and Farm Service
Agency (technical and financial
assistance for projects) and the Forest
Service (aquatic habitat restoration, fire
management plans, fire suppression,
fuel reduction treatments, forest plans,
and mining permits).
(3) U.S. Department of Energy
(renewable and alternative energy
projects).
(4) Federal Energy Regulatory
Commission (interstate pipeline
construction and maintenance, dam
relicensing, and hydrokinetics).
(5) U.S. Department of Transportation
(highway and bridge construction and
maintenance).
(6) U.S. Fish and Wildlife Service
(issuance of section 10 permits for
enhancement of survival, habitat
conservation plans, and safe harbor
agreements; Partners for Fish and
Wildlife program projects benefiting
these species or other listed species; and
Wildlife and Sportfish Restoration
program sportfish stocking).
(7) Environmental Protection Agency
(water quality criteria and permitting).
(8) Tennessee Valley Authority (flood
control, navigation, hydropower, and
land management for the Tennessee
River system).
(9) Office of Surface Mining
Reclamation and Enforcement (land
resource management plans, mining
permits, oil and natural gas permits,
abandoned mine land projects, and
renewable energy development).
(10) National Park Service (land
management plans and permitting).
Exemptions
Application of Section 4(a)(3) of the Act
Section 4(a)(3)(B)(i) of the Act (16
U.S.C. 1533(a)(3)(B)(i)) provides that the
Secretary shall not designate as critical
habitat any lands or other geographical
areas owned or controlled by the
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Department of Defense (DoD), or
designated for its use, that are subject to
an integrated natural resources
management plan (INRMP) prepared
under section 101 of the Sikes Act
Improvement Act of 1997 (16 U.S.C.
670a), if the Secretary determines in
writing that such plan provides a benefit
to the species for which critical habitat
is proposed for designation. There are
no DoD lands with a completed INRMP
within the critical habitat designation.
Consideration of Impacts Under Section
4(b)(2) of the Act
Section 4(b)(2) of the Act states that
the Secretary shall designate and make
revisions to critical habitat on the basis
of the best available scientific data after
taking into consideration the economic
impact, national security impact, and
any other relevant impact of specifying
any particular area as critical habitat.
The Secretary may exclude an area from
critical habitat based on economic
impacts, impacts on national security,
or any other relevant impacts. Exclusion
decisions are governed by the
regulations at 50 CFR 424.19 and the
Policy Regarding Implementation of
Section 4(b)(2) of the Endangered
Species Act, 81 FR 7226 (Feb. 11, 2016)
(2016 Policy)—both of which were
developed jointly with the National
Marine Fisheries Service (NMFS). We
also refer to a 2008 Department of the
Interior Solicitor’s opinion entitled
‘‘The Secretary’s Authority to Exclude
Areas from a Critical Habitat
Designation under Section 4(b)(2) of the
Endangered Species Act’’ (M–37016).
We explain each decision to exclude
areas, as well as decisions not to
exclude, to demonstrate that the
decision is reasonable.
The Secretary may exclude any
particular area if she determines that the
benefits of such exclusion outweigh the
benefits of including such area as part
of the critical habitat, unless she
determines, based on the best scientific
data available, that the failure to
designate such area as critical habitat
will result in the extinction of the
species. In making the determination to
exclude a particular area, the statute on
its face, as well as the legislative history,
are clear that the Secretary has broad
discretion regarding which factor(s) to
use and how much weight to give to any
factor. In this final rule, we are not
excluding any areas from critical
habitat.
Exclusions Based on Economic Impacts
Section 4(b)(2) of the Act and its
implementing regulations require that
we consider the economic impact that
may result from a designation of critical
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habitat. In order to consider economic
impacts, we prepared an incremental
effects memorandum (IEM) and
screening analysis which, together with
our narrative and interpretation of
effects, we consider our economic
analysis of the critical habitat
designation and related factors (Service
2020, entire). The analysis, dated March
19, 2020, was made available for public
review from September 29, 2020,
through December 28, 2020 (Industrial
Economics, Inc. 2020, entire). The
economic analysis addressed probable
economic impacts of critical habitat
designation for the longsolid and round
hickorynut. Following the close of the
comment period, we reviewed and
evaluated all information submitted
during the comment period that may
pertain to our consideration of the
probable incremental economic impacts
of this critical habitat designation.
Additional information relevant to the
probable incremental economic impacts
of critical habitat designation for the
longsolid and round hickorynut is
summarized below and available in the
screening analysis for the longsolid and
round hickorynut (Industrial
Economics, Inc. 2020, entire), available
at https://www.regulations.gov.
Executive Orders (E.O.s) 12866 and
13563 direct Federal agencies to assess
the costs and benefits of available
regulatory alternatives in quantitative
(to the extent feasible) and qualitative
terms. Consistent with the E.O.
regulatory analysis requirements, our
effects analysis under the Act may take
into consideration impacts to both
directly and indirectly affected entities,
where practicable and reasonable. If
sufficient data are available, we assess,
to the extent practicable, the probable
impacts to both directly and indirectly
affected entities. As part of our
screening analysis, we considered the
types of economic activities that are
likely to occur within the areas likely
affected by the critical habitat
designation. In our evaluation of the
probable incremental economic impacts
that may result from the designation of
critical habitat for the longsolid and
round hickorynut, first we identified, in
the IEM dated February 13, 2020
(Service 2020, entire), probable
incremental economic impacts
associated with the following categories
of activities: instream excavation or
dredging; impoundments;
channelization; sand and gravel mining;
clearing riparian vegetation; discharge
of fill materials; urban development;
water diversion; water withdrawal;
water draw-down; hydropower
generation and discharges; release of
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chemicals, biological pollutants, or
heated effluents into surface water or
connected ground water at a point
source or by dispersed release
(nonpoint); construction projects; oil
and gas development; coal mining;
livestock grazing; timber harvest; and
other watershed or floodplain activities
that release sediments or nutrients into
the water. We considered each industry
or category individually. Additionally,
we considered whether their activities
have any Federal involvement.
Critical habitat designation generally
will not affect activities that do not have
any Federal involvement; under the Act,
the designation of critical habitat only
affects activities conducted, funded,
permitted, or authorized by Federal
agencies. In areas where the longsolid or
round hickorynut are present, Federal
agencies are required to consult with the
Service under section 7 of the Act on
activities they fund, permit, or
implement that may affect the species.
Consultations to avoid the destruction
or adverse modification of critical
habitat will be incorporated into the
existing consultation process.
In our IEM, we attempted to clarify
the distinction between the effects that
would result from the species being
listed and those attributable to the
critical habitat designation (i.e.,
difference between the jeopardy and
adverse modification standards) for the
longsolid’s and round hickorynut’s
critical habitat. Because we are
designating critical habitat for the
longsolid and round hickorynut
concurrently with listing the species, it
has been our experience that it is more
difficult to discern which conservation
efforts are attributable to the species’
being listed and those which will result
solely from the designation of critical
habitat; this is particularly difficult
where there is no unoccupied critical
habitat and, thus, there will be
consultations for all areas based on the
species’ presence in those areas.
However, the following specific
circumstances in this case help to
inform our evaluation: (1) The essential
physical or biological features identified
for critical habitat are the same features
essential for the life requisites of the
species, and (2) any actions that would
result in sufficient harm or harassment
to constitute jeopardy to the longsolid or
round hickorynut would also likely
adversely affect the essential physical or
biological features of critical habitat.
The IEM outlines our rationale
concerning this limited distinction
between baseline conservation efforts
and incremental impacts of the
designation of critical habitat for this
species. This evaluation of the
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incremental effects has been used as the
basis to evaluate the probable
incremental economic impacts of this
designation of critical habitat.
The final critical habitat designation
for the longsolid includes 12 units, all
of which are occupied by the species.
Ownership of riparian lands adjacent to
the units includes 810 river mi (1,304
km; 74 percent) in private ownership
and 305 river mi (491 km; 26 percent)
in public (Federal, State, or local
government) ownership. The final
critical habitat designation for the round
hickorynut includes 14 units, all of
which are occupied by the species.
Ownership of riparian lands adjacent to
the units includes 709 river mi (1,141
km; 77 percent) in private ownership
and 212 river mi (341 km; 23 percent)
in public (Federal, State, or local
government) ownership.
Total incremental costs of critical
habitat designation for the longsolid and
round hickorynut are anticipated to be
approximately $327,000 (2020 dollars)
per year for the next 10 years. The costs
are reflective of the critical habitat area
(i.e., 1,115 river mi (1,794 km) for the
longsolid and 921 river mi (1,482 km)
for the round hickorynut (some of
which overlap each other)), the presence
of the species (i.e., occupied) in these
areas, and the presence of other
federally listed species and designated
critical habitats. Since consultation is
already required in these areas as a
result of the presence of other listed
species and critical habitats and will be
required as a result of the listing of the
longsolid and round hickorynut, the
economic costs of the critical habitat
designation will likely be primarily
limited to additional administrative
efforts to consider adverse modification
for these two species in section 7
consultations. In total, 159 section 7
consultation actions (approximately 3
formal consultations, 114 informal
consultations, and 38 technical
assistance efforts) are anticipated to
occur annually in designated critical
habitat areas. Critical habitat may also
trigger additional regulatory changes.
For example, the designation may cause
other Federal, State, or local permitting
or regulatory agencies to expand or
change standards or requirements.
Regulatory uncertainty generated by
critical habitat may also have impacts.
For example, landowners or buyers may
perceive that the rule restricts land or
water use activities in some way and,
therefore, value the use of the land less
than they would have absent critical
habitat.
We solicited data and comments from
the public regarding the economic
analysis, as well as all aspects of the
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September 29, 2020 (85 FR 61384),
proposed rule. We did not receive any
additional information on economic
impacts during the public comment
period to determine whether any
specific areas should be excluded from
the final critical habitat designation
under authority of the Act’s section
4(b)(2) and our implementing
regulations at 50 CFR 424.19.
As discussed above, we considered
the economic impacts of the critical
habitat designation, the Secretary is not
exercising her discretion to exclude any
areas from this designation of critical
habitat for the longsolid and round
hickorynut based on economic impacts.
A copy of the IEM and screening
analysis with supporting documents
may be obtained by contacting the
Asheville Ecological Services Field
Office (see FOR FURTHER INFORMATION
CONTACT) or by downloading from the
internet at https://www.regulations.gov.
Exclusions Based on Impacts on
National Security and Homeland
Security
In preparing this rule, we determined
that there are no lands within the
designated critical habitat for the
longsolid or round hickorynut that are
owned or managed by the DoD or
Department of Homeland Security, and,
therefore, we anticipate no impact on
national security or homeland security.
We did not receive any additional
information during the public comment
period for the proposed designation
regarding impacts of the designation on
national security or homeland security
that would support excluding any
specific areas from the final critical
habitat designation under authority of
section 4(b)(2) and our implementing
regulations at 50 CFR 424.19, as well as
the 2016 Policy.
Exclusions Based on Other Relevant
Impacts
Under section 4(b)(2) of the Act, we
consider any other relevant impacts, in
addition to economic impacts and
impacts on national security as
discussed above. To identify other
relevant impacts that may affect the
exclusion analysis, we consider a
number of factors, including whether
there are permitted conservation plans
covering the species in the area such as
HCPs, safe harbor agreements, or
candidate conservation agreements with
assurances, or whether there are nonpermitted conservation agreements and
partnerships that would be encouraged
by designation of, or exclusion from,
critical habitat. In addition, we look at
whether Tribal conservation plans or
partnerships, Tribal resources, or
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government-to-government
relationships of the United States with
Tribal entities may be affected by the
designation. We also consider any State,
local, social, or other impacts that might
occur because of the designation.
We are not excluding any areas from
critical habitat. In preparing this final
rule, we have determined that there are
currently no HCPs or other management
plans for the longsolid and round
hickorynut, and the designation does
not include any Tribal lands or trust
resources. We anticipate no impact on
Tribal lands, partnerships, or HCPs from
this final critical habitat designation.
We did not receive any additional
information during the public comment
period for the proposed rule regarding
other relevant impacts to support
excluding any specific areas from the
final critical habitat designation under
authority of section 4(b)(2) and our
implementing regulations at 50 CFR
424.19, as well as the 2016 Policy.
Accordingly, the Secretary is not
exercising her discretion to exclude any
areas from this designation based on
other relevant impacts.
Summary of Comments and
Recommendations
In the proposed rule published on
September 29, 2020 (85 FR 61384), we
requested that all interested parties
submit written comments on the
proposal by December 28, 2020. We also
contacted appropriate Federal and State
agencies, scientific experts and
organizations, and other interested
parties and invited them to comment on
the proposal. Newspaper notices
inviting general public comment were
published in the USA Today legal
notice section on September 30, 2020.
Although we invited requests for a
public hearing in the proposed rule, we
did not receive any requests for a public
hearing. All substantive information
received during the comment period has
either been incorporated directly into
this final determination or is addressed
below.
Peer Reviewer Comments
As discussed in Peer Review above,
we received comments from three
specialists for the longsolid (which
informed the SSA report and this final
rule), and no responses for the round
hickorynut. We reviewed all comments
we received from the peer reviewers for
substantive issues and new information
regarding the information contained in
the longsolid’s SSA report. The peer
reviewers generally concurred with our
methods and conclusions, and provided
additional information, clarifications,
and suggestions to improve the final
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SSA report. Peer reviewer comments
were incorporated into the SSA report
and this final rule as appropriate.
State Agency Comments
We received comments from agencies
in six States: Michigan, Ohio,
Pennsylvania, West Virginia, North
Carolina, and Mississippi.
(1) Comment: The Michigan
Department of Natural Resources (DNR)
requested that we not list the longsolid
as an endangered species in the State of
Michigan, and that we postpone listing
the round hickorynut as an endangered
species until additional information
concerning their distribution and status
is available. Additionally, the Michigan
DNR requested we partner with them to
conduct additional surveys in Michigan
to evaluate the current population status
of the round hickorynut due to
information gaps for this species in
Michigan.
Our Response: The longsolid does not
occur in Michigan, nor are there any
historical records for the State;
therefore, we did not propose to list,
and are not listing in this rule, the
longsolid within the State of Michigan.
We agree that there is limited
information available for round
hickorynut in Michigan; however, we
must make a decision based the best
available scientific and commercial
information. Accordingly, our analysis
of the best available data indicates that
the species meets the definition of a
threatened species under the Act (see
Determination of Status for the
Longsolid and Round Hickorynut,
above). We support the State conducting
additional surveys due to its status as a
‘‘State trust species,’’ and we will
continue to coordinate with Michigan
DNR to ensure that the best available
information is also used for any future
conservation actions.
(2) Comment: The State of West
Virginia recommended that the
Kanawha River be included in the
discussion of transportation threats
regarding barge traffic given it is
navigable and subject to barge traffic
activity.
Our Response: The Kanawha River is
incorporated by reference (i.e., the listed
populations in this section of the
proposed rule include Taylor (1983b, p.
5)), which is a mussel survey of the
Kanawha River. Our intent was that the
threat discussion of transportation
include all major river basins (HUC 2
level), which includes the Kanawha
River, where the longsolid is extant.
(3) Comment: The State of West
Virginia recommended that Unit RH 4
(Middle Island Creek) include
Meathouse Fork, which is a major
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tributary of Middle Island Creek. The
State indicated that West Virginia DNR
surveys have found greater numbers of
round hickorynut in Meathouse Fork
than in the whole of the Elk River.
Our Response: Meathouse Fork,
although occupied by the round
hickorynut, was not proposed as critical
habitat and is not designated as critical
habitat in this rule. We have determined
that the ‘‘core’’ population in Middle
Island Creek is sufficient to maintain
resiliency in the watershed, as it is
considered a stronghold population
(which was part of the criteria for
critical habitat selection). At this time,
the Meathouse Fork population exhibits
low resiliency and is subject to a high
level of threats, such as contaminant
spills, as discussed under Threats
Analysis, above. We determined it does
not contain the physical or biological
features essential for the conservation of
the species and, therefore, does not meet
the definition of critical habitat.
(4) Comment: The State of Ohio stated
that listing these species will increase
their costs for complying with the Act
and the National Environmental Policy
Act (NEPA; 42 U.S.C. 4321 et seq.),
mainly through increased species
surveys, the costs associated with
formal consultations (the production of
biological assessments), and possible
costs associated with project delays due
to the length of time to conduct formal
consultation versus informal
consultation. The State indicated that
due to listing the round hickorynut, it
will be necessary to conduct two
additional survey efforts and two
possible formal consultations per year
on average. The State asserts these
formal consultations will add
approximately $100,000–$200,000 per
year in project costs, potentially
increasing the State’s compliance costs
by 4 percent per year.
Our Response: The Act requires the
Secretary to base listing determinations
solely on the best scientific and
commercial data available; thus, we
cannot factor in possible economic costs
into a decision to list a species.
However, we acknowledge that listing
either species could result in additional
costs to the State to comply with the
Act, and potentially other laws, given
the protections that are afforded listed
species. Separately, we are required to
consider economic costs for designating
critical habitat. As such, the economic
analysis for the longsolid and round
hickorynut focuses on the incremental
impact of the critical habitat
designation. The economic analysis
conducted for the critical habitat
designation uses the rate of past
consultations conducted on similar
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listed aquatic species that occur within
the critical habitat areas to forecast the
rate of future section 7 consultations
that may occur for the longsolid and
round hickorynut (IEc 2020, entire;
Service 2020, entire). Critical habitat
designation is not anticipated to result
in additional conservation efforts being
included as part of section 7
consultations beyond what would have
already been required absent critical
habitat designation.
(5) Comment: The State of Ohio
commented that although listing round
hickorynut is logical, they are
concerned and disagree with
designating critical habitat in the Grand
River through the shipping channel.
Further, they stated that the shipping
channel portion of the Grand River is
regularly dredged to provide access to
Lake Erie, and the dredging has resulted
in stream channel modifications for
marinas and docks.
Our Response: We agree that the
Grand River has experienced humancaused modifications over time.
However, the Grand River population of
round hickorynut is considered one of
only two stronghold management units
that remain, and the best available
information indicates that the shipping
channel portion of the river is occupied.
Further, because the round hickorynut
appears to have adapted to conditions at
river outflows and along shorelines of
impoundments (e.g., Lake St. Clair), we
find it is important at this time that the
lower Grand River maintains some level
of connectivity with other Lake Erie
tributaries, such as the Black River in
Ohio, and the Belle, Black, and Pine
Rivers in Michigan.
The Grand River Unit (RH 2) is the
only critical habitat unit designated for
the round hickorynut in the Great Lakes
basin. This area was once fully
connected to Lake Erie, which allowed
connectivity with other river tributary
systems. The Grand River population,
occurring within this unit, is important
because it currently has high resiliency,
it contains the only documented
recruiting population in the Great Lakes
basin, and the round hickorynut occurs
throughout the river. Accordingly, we
determined this unit contains features
that are essential to the conservation of
the species and that may require special
management considerations or
protection and, therefore, that it meets
the definition of critical habitat.
(6) Comment: The State of Mississippi
(Mississippi Forestry Association)
requested that we take into
consideration the State’s BMP
compliance rate for certified forest lands
when evaluating information for the
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round hickorynut, specifically for
SMZs.
The comment states that BMPs are
nonregulated, voluntary guidelines for
silviculture activities that, when
properly applied, will protect water
quality from non-point source
pollutants while maintaining site
productivity. Further, the comment
noted that the 2019 BMP
Implementation Survey (implemented
on a 3-year cycle by the Mississippi
Forestry Commission) revealed that 95.3
percent of the applicable BMPs were
implemented. The Statewide
compliance of the survey was
determined to be 95 percent at the 95
percent confidence level. The comment
asserts that the SMZs benefit the
mussels by protecting water quality
through filtering nutrients and trapping
sediments, regulating water
temperature, and acting as a protective
barrier around the body of water to limit
activity near the channel.
Our Response: We did take into
consideration the Mississippi BMP
compliance rate in SMZs. However,
only one population of round
hickorynut occurs within Mississippi,
and it is currently in low condition. The
Mississippi BMPs are nonregulated,
voluntary guidelines for silviculture
activities. We recognize the high
compliance rates of BMPs on Statecertified forest lands and we have
incorporated an exception under the
section 4(d) rule for silvicultural
activities that implement state-approved
BMPs.
(7) Comment: The State of Mississippi
(Mississippi Forestry Association) stated
that they interpret the critical habitat
designation to include the river channel,
and they requested clarification that the
lands adjacent to the stream bank are
not included in the critical habitat
designation.
Our Response: The State of
Mississippi’s interpretation is correct.
Lands adjacent to the stream bank are
not included in the critical habitat
designation, although certain activities
on lands adjacent to occupied streams
can influence the resource needs of the
listed species that occurs within the
river (e.g., increased sediments from
activities on adjacent lands could
reduce water quality).
Public Comments—Economics
(8) Comment: One commenter stated
that the benefits of excluding the
proposed areas in Kentucky from the
critical habitat designations due to
economic impact far outweigh the
benefits of their inclusion. With over
2,000 river miles across 9 States, and an
extensive list of industries and activities
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impacted by the proposed critical
habitat designations, the commenter
asserted that the anticipated $327,000 in
annual costs outlined in the economic
analysis does not fully capture the
economic hardship placed on the
surrounding communities.
Our Response: These comments do
not identify specific data sources or
assumptions used in the economic
analysis of critical habitat designation,
nor did the commenter provide new
information that could be used to revise
our economic analysis. We find our
economic analysis presents a reasonable
estimate of the incremental impact (the
cost beyond what would be incurred
without the designation of critical
habitat for longsolid and round
hickorynut). Our economic analysis
focuses on the incremental impact of the
critical habitat designation because the
statutory purposes of the economic
analysis are to inform the mandatory
consideration of the economic impact of
the designation of critical habitat, as
well as to inform the discretionary
section 4(b)(2) exclusion analysis, and
to determine compliance with relevant
statutes and Executive Orders.
(9) Comment: Multiple commenters
expressed concern about impacts of the
proposed rule on tourism and
recreation; however, many commenters
focused on impacts associated with the
proposed listing rule as compared to
impacts associated with the proposed
4(d) rule or critical habitat designation.
These commenters described the
importance of tourism to the local
economies, particularly in the following
Kentucky counties: Rockcastle, Laurel
(county seat is London), and Taylor.
Some commenters stated that they
oppose any action that would limit the
current or future levels of fishing,
boating, hiking, or other recreational
activities, including impacts to the
lands adjoining the affected rivers. One
commenter stated that the proposed rule
would negatively impact the economy
of this area to the point of halting the
growth and development of a
community.
Our Response: The Act requires the
Secretary to base listing determinations
solely on the best scientific and
commercial data available; thus, we
cannot factor possible economic costs to
tourism or other industries into a
decision to list a species. Although we
acknowledge that listing either species
could result in additional costs given
the protections afforded to listed
species, we do not anticipate these
protections as affecting current or future
levels of fishing, boating, hiking, or
other recreational activities. Separately,
we are required to consider economic
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costs for designating critical habitat. Our
economic analysis of critical habitat
designation does not anticipate that the
designation will result in additional
conservation efforts that would not
already occur due to the listing of
longsolid and round hickorynut or
presence of other listed species in
critical habitat areas. As such, the
critical habitat designation for the
longsolid and round hickorynut is not
anticipated to result in additional
restrictions or requirements for
recreation and tourism activities,
beyond those already anticipated to
occur absent of this critical habitat
designation.
(10) Comment: Several commenters
expressed concern that the proposed
rule would adversely affect local
farmers and livestock producers; many
commenters were focused on impacts
associated with listing the species.
Commenters expressed concern that the
proposed rule would cause a loss of
farming revenue, which would have
broad adverse effects on their
communities. One commenter
expressed concern that the proposed
rule may halt agricultural operations.
Our Response: It is our statutory
requirement to ensure that listing
decisions are based solely on biological
considerations and not economic
impacts; thus, costs from listing the
longsolid or the round hickorynut
cannot be factored into the listing
decisions. Because the primary purpose
of the economic analysis is to facilitate
the mandatory consideration of the
economic impact of the designation of
critical habitat, to inform the
discretionary section 4(b)(2) exclusion
analysis, and to determine compliance
with relevant statutes and Executive
Orders, the economic analysis focused
on the incremental impact of the critical
habitat designation. The economic
analysis of the designation of critical
habitat for the longsolid and round
hickorynut follows this incremental
approach. See also our responses to
Comments (8) and (9), above.
We recognize in the economic
analysis that critical habitat designation
may cause landowners to perceive that
private lands (including farming,
agricultural, or livestock operations)
will be subject to use restrictions or
litigation from third parties, resulting in
costs. However, we are unable to
quantify the degree to which the
public’s perception of possible
restrictions on the use of private land
designated as critical habitat may affect
private property values. Further, we
recognize that a number of factors may
already result in perception-related
effects on these private lands, including
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the listing of the species and the
presence of other listed species and
critical habitats in these areas, which
may temper any additional perceptionrelated effects of this critical habitat
designation.
(11) Comment: One commenter
expressed concern that the economic
analysis does not sufficiently address
the potential benefits of the designation
of critical habitat. Specifically, the
commenter requests that we take into
consideration the economic benefits of
protecting habitat for these mussels,
including ecosystem services, the
protection of clean water, the reduced
cost of water treatment for drinking
water supplies, as well as public health
benefits.
Our Response: The primary intended
benefit of critical habitat designation for
the longsolid and round hickorynut is to
support the species’ long-term
conservation. Generally speaking,
critical habitat designation could also
generate ancillary benefits such as
improved drinking water quality or
public health benefits. However, as
described in section 3 of the economic
analysis (Industrial Economics, Inc.
2020, pp. 7–9), incremental land or
water management changes are unlikely
to result from the designation of critical
habitat for the longsolid and round
hickorynut. Similarly, no additional
project modifications to avoid adverse
modification of critical habitat for the
longsolid or round hickorynut mussels
are anticipated. Therefore, in this
instance, critical habitat designation is
unlikely to incrementally affect the
types of ancillary benefits described by
the commenter.
Public Comments—Forestry
(12) Comment: One commenter
asserted that the information in the
proposed rule and the SSA report would
lead the casual reader to think that
‘‘forest clearing’’ is the same as
‘‘silviculture,’’ and that these two
activities are the leading threats to the
species, which is not the case.
Our Response: We agree that forest
clearing and silviculture are not
synonymous and note that the latter is
not a primary threat to the longsolid or
round hickorynut. For clarity, ‘‘forest
clearing’’ is the removal of forested
habitats through tree removal to
facilitate a different land use, thereby
altering ecosystem function.
Silvicultural practices control the
growth, composition, structure, and
quality of forests at the stand-level to
meet values and needs, specifically
timber production; however, they do not
alter land use. The SSA reports have
been revised to clarify this distinction.
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Please see more discussion and revised
language regarding silviculture under
Forest Conversion in Threats Analysis,
above.
(13) Comment: Multiple commenters
asserted that forestry BMPs are
implemented at high rates nationally
and in some States where one or both
species occur, and thus requested an
exception in the 4(d) rule for forestry
activities.
Our Response: We recognize that
silvicultural operations are widely
implemented in accordance with Stateapproved best management practices
(BMPs; as reviewed by Cristan et al.
2016, entire), and the adherence to these
BMPs broadly protects water quality,
particularly related to sedimentation (as
reviewed by Cristan et al. 2016, entire;
Warrington et al. 2017, entire; and
Schilling et al. 2021, entire). We added
that statement under Forest Conversion
in Threats Analysis, above. In addition,
we agree that the best available science
indicates that proper implementation of
forestry BMPs reduces negative effects
on water quality outcomes compared to
historical silvicultural practices or those
that do not apply or properly implement
BMPs. Given BMPs generally are
implemented at high rates, we added an
exception to incidental take in the
section 4(d) rule resulting from forestry
activities that follow state approved
forest management BMPs (see II. Final
Rule Issued Under Section 4(d) of the
Act, above).
(14) Comment: One commenter stated
that forest certification programs
provide assurance that BMPs are
implemented in the ranges of both
species and requested the addition of an
exception in the 4(d) rule for Statecertified forestry programs.
Our Response: We acknowledge and
support the continued implementation
of the forest certification programs and
their State-approved BMPs. Given that
we added an exception to incidental
take in the section 4(d) rule resulting
from forestry activities that follow state
approved forest management BMPs and
all State-certified forestry programs
implement these BMPs at high rates, an
additional exception specifically
targeting State-certified forestry
programs would be redundant. We also
note that most longsolid and round
hickorynut populations occurring on
forest lands are within U.S. National
Forests (e.g., Allegheny, Daniel Boone,
George Washington and Jefferson, and
Wayne National Forests), which are
subject to section 7 consultation even
with the incidental take exception
resulting from forestry and silviculture
activities.
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(15) Comment: One commenter stated
that take resulting from silviculture
activities should not be included in a
4(d) rule for the longsolid because of the
limited scope of this species’ potential
nexus with silviculture activities;
another commenter encouraged the
Service to recognize the positive role of
responsible forest management and to
articulate this in the final rule. As such,
the commenter recommended adding an
exception to the 4(d) rule for
silvicultural practices and forest
management activities that implement
State-approved BMPs.
Our Response: To the extent
silvicultural practices are implemented
in a manner that follows State-approved
BMPs, we agree with the commenter
that there is limited potential for the
longsolid to be exposed to silvicultural
activities. We recognize responsible
forest management that implements
State-approved BMPs as a land use
activity that can promote stable riparian
vegetation and aquatic habitats. The 4(d)
rule is intended to provide exceptions
for proactive conservation efforts, such
as population and habitat restoration
and protection. Therefore, in the 4(d)
rule for longsolid and round hickorynut,
we have added an exception for
incidental take resulting from forestry
activities that follow State-approved
forest management BMPs.
Public Comments—Miscellaneous
(16) Comment: Several commenters
claimed that the proposed critical
habitat designations are insufficient.
Generally, the commenters contend that
the current occupied habitat does not
provide enough space for the
populations to recover and that
unoccupied habitat should be included
in the critical habitat designation in
anticipation of the species’ restoration
or population expansion. One
commenter requested designation of
unoccupied habitat in the Cumberland,
Ohio, and Tennessee River basins for
both species, while a different
commenter also included the Great
Lakes and Lower Mississippi River
basins specifically for the round
hickorynut.
Our Response: Under the first prong
of the Act’s definition of critical habitat,
areas within the geographical area
occupied by the species at the time it
was listed are included in a critical
habitat designation if they contain
physical or biological features (1) which
are essential to the conservation of the
species and (2) which may require
special management considerations or
protection. For these areas, critical
habitat designations identify, to the
extent known using the best scientific
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and commercial data available, those
physical or biological features that are
essential to the conservation of the
species (such as space, food, cover, and
protected habitat). In identifying those
physical or biological features within an
area, we focus on the specific features
that support the life-history needs of the
species, including but not limited to,
water characteristics, soil type,
geological features, prey, vegetation,
symbiotic species, or other features.
We determine whether unoccupied
areas are essential for the conservation
of the species by considering the lifehistory, status, and conservation needs
of the species. This determination is
further informed by any generalized
conservation strategy, criteria, or outline
that may have been developed for the
species to provide a substantive
foundation for identifying which
features and specific areas are essential
to the conservation of the species and,
as a result, the development of the
critical habitat designation.
We are not proposing to designate as
critical habitat any areas outside the
geographical area currently occupied by
the species because we determined that
occupied areas are sufficient to conserve
the longsolid and round hickorynut. For
the longsolid, in total, we are
designating approximately 1,115 river
mi (1,794 river km) within 12 units of
critical habitat; and for the round
hickorynut, in total, we are designating
approximately 921 river mi (1,482 river
km) within 14 units of critical habitat.
The critical habitat designation focuses
on current strongholds and those
populations with sufficient resiliency in
determining the features that are
essential for the conservation of the
species (see Criteria Used to Identify
Critical Habitat, above). These rivers
and streams (identified as critical
habitat for the longsolid and round
hickorynut) contain populations that are
large and dense enough, that are most
likely to be self-sustaining over time
(despite fluctuations in local
conditions), and that also have retained
the physical or biological features that
will allow for the maintenance and
expansion of existing populations.
These units also represent populations
that are stable and distributed over a
wide geographic area. We recognize that
habitat is dynamic, and species may
move from one area to another over
time. Thus, critical habitat designated at
a particular point in time may not
include all of the habitat areas that we
may later determine are necessary for
the recovery of the species. For these
reasons, a critical habitat designation
does not signal that habitat outside the
designated area is unimportant or may
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not be needed eventually for recovery of
the species. Areas that are important to
the conservation of the species, both
inside and outside the critical habitat
designation, will continue to be subject
to: (1) Conservation actions
implemented under section 7(a)(1) of
the Act; (2) regulatory protections
afforded by the requirement in section
7(a)(2) of the Act for Federal agencies to
ensure their actions are not likely to
jeopardize the continued existence of
any endangered or threatened species;
and (3) the prohibitions found in section
9 of the Act.
Required Determinations
Regulatory Planning and Review
(Executive Orders 12866 and 13563)
Executive Order 12866 provides that
the Office of Information and Regulatory
Affairs (OIRA) in the Office of
Management and Budget will review all
significant rules. OIRA has determined
that this rule is not significant.
Executive Order 13563 reaffirms the
principles of E.O. 12866 while calling
for improvements in the nation’s
regulatory system to promote
predictability, to reduce uncertainty,
and to use the best, most innovative,
and least burdensome tools for
achieving regulatory ends. The
executive order directs agencies to
consider regulatory approaches that
reduce burdens and maintain flexibility
and freedom of choice for the public
where these approaches are relevant,
feasible, and consistent with regulatory
objectives. E.O. 13563 emphasizes
further that regulations must be based
on the best available science and that
the rulemaking process must allow for
public participation and an open
exchange of ideas. We have developed
this final rule in a manner consistent
with these requirements.
Regulatory Flexibility Act (5 U.S.C. 601
et seq.)
Under the Regulatory Flexibility Act
(RFA; 5 U.S.C. 601 et seq.), as amended
by the Small Business Regulatory
Enforcement Fairness Act of 1996
(SBREFA; 5 U.S.C. 801 et seq.),
whenever an agency is required to
publish a notice of rulemaking for any
proposed or final rule, it must prepare
and make available for public comment
a regulatory flexibility analysis that
describes the effects of the rule on small
entities (i.e., small businesses, small
organizations, and small government
jurisdictions). However, no regulatory
flexibility analysis is required if the
head of the agency certifies the rule will
not have a significant economic impact
on a substantial number of small
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entities. The SBREFA amended the RFA
to require Federal agencies to provide a
certification statement of the factual
basis for certifying that the rule will not
have a significant economic impact on
a substantial number of small entities.
According to the Small Business
Administration, small entities include
small organizations such as
independent nonprofit organizations;
small governmental jurisdictions,
including school boards and city and
town governments that serve fewer than
50,000 residents; and small businesses
(13 CFR 121.201). Small businesses
include manufacturing and mining
concerns with fewer than 500
employees, wholesale trade entities
with fewer than 100 employees, retail
and service businesses with less than $5
million in annual sales, general and
heavy construction businesses with less
than $27.5 million in annual business,
special trade contractors doing less than
$11.5 million in annual business, and
agricultural businesses with annual
sales less than $750,000. To determine
if potential economic impacts to these
small entities are significant, we
considered the types of activities that
might trigger regulatory impacts under
this designation as well as types of
project modifications that may result. In
general, the term ‘‘significant economic
impact’’ is meant to apply to a typical
small business firm’s business
operations.
Under the RFA, as amended, and
following recent court decisions,
Federal agencies are required to
evaluate the potential incremental
impacts of rulemaking on those entities
directly regulated by the rulemaking
itself; in other words, the RFA does not
require agencies to evaluate the
potential impacts to indirectly regulated
entities. The regulatory mechanism
through which critical habitat
protections are realized is section 7 of
the Act, which requires Federal
agencies, in consultation with the
Service, to ensure that any action
authorized, funded, or carried out by the
agency is not likely to destroy or
adversely modify critical habitat.
Therefore, under section 7, only Federal
action agencies are directly subject to
the specific regulatory requirement
(avoiding destruction and adverse
modification) imposed by critical
habitat designation. Consequently, it is
our position that only Federal action
agencies will be directly regulated by
this critical habitat designation. There is
no requirement under the RFA to
evaluate the potential impacts to entities
not directly regulated. Moreover,
Federal agencies are not small entities.
Therefore, because no small entities will
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be directly regulated by this rulemaking,
we certify that this critical habitat
designation will not have a significant
economic impact on a substantial
number of small entities.
During the development of this final
rule, we reviewed and evaluated all
information submitted during the
comment period on the September 29,
2020, proposed rule (85 FR 61384) that
may pertain to our consideration of the
probable incremental economic impacts
of this critical habitat designation.
Based on this information, we affirm our
certification that this critical habitat
designation will not have a significant
economic impact on a substantial
number of small entities, and a
regulatory flexibility analysis is not
required.
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Energy Supply, Distribution, or Use—
Executive Order 13211
Executive Order 13211 (Actions
Concerning Regulations That
Significantly Affect Energy Supply,
Distribution, or Use) requires agencies
to prepare Statements of Energy Effects
when undertaking certain actions.
Facilities that provide energy supply,
distribution, or use occur within some
units of the critical habitat designations
(e.g., dams, pipelines) and may
potentially be affected. We determined
that consultations, technical assistance,
and requests for species lists may be
necessary in some instances. However,
in our economic analysis, we did not
find that these critical habitat
designations would significantly affect
energy supplies, distribution, or use.
Therefore, this action is not a significant
energy action, and no Statement of
Energy Effects is required.
Unfunded Mandates Reform Act (2
U.S.C. 1501 et seq.)
In accordance with the Unfunded
Mandates Reform Act (2 U.S.C. 1501 et
seq.), we make the following findings:
(1) This rule will not produce a
Federal mandate. In general, a Federal
mandate is a provision in legislation,
statute, or regulation that would impose
an enforceable duty upon State, local, or
Tribal governments, or the private
sector, and includes both ‘‘Federal
intergovernmental mandates’’ and
‘‘Federal private sector mandates.’’
These terms are defined in 2 U.S.C.
658(5)–(7). ‘‘Federal intergovernmental
mandate’’ includes a regulation that
‘‘would impose an enforceable duty
upon State, local, or Tribal
governments’’ with two exceptions. It
excludes ‘‘a condition of Federal
assistance.’’ It also excludes ‘‘a duty
arising from participation in a voluntary
Federal program,’’ unless the regulation
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‘‘relates to a then-existing Federal
program under which $500,000,000 or
more is provided annually to State,
local, and Tribal governments under
entitlement authority,’’ if the provision
would ‘‘increase the stringency of
conditions of assistance’’ or ‘‘place caps
upon, or otherwise decrease, the Federal
Government’s responsibility to provide
funding,’’ and the State, local, or Tribal
governments ‘‘lack authority’’ to adjust
accordingly. At the time of enactment,
these entitlement programs were:
Medicaid; Aid to Families with
Dependent Children work programs;
Child Nutrition; Food Stamps; Social
Services Block Grants; Vocational
Rehabilitation State Grants; Foster Care,
Adoption Assistance, and Independent
Living; Family Support Welfare
Services; and Child Support
Enforcement. ‘‘Federal private sector
mandate’’ includes a regulation that
‘‘would impose an enforceable duty
upon the private sector, except (i) a
condition of Federal assistance or (ii) a
duty arising from participation in a
voluntary Federal program.’’
The designation of critical habitat
does not impose a legally binding duty
on non-Federal Government entities or
private parties. Under the Act, the only
regulatory effect is that Federal agencies
must ensure that their actions are not
likely to destroy or adversely modify
critical habitat under section 7. While
non-Federal entities that receive Federal
funding, assistance, or permits, or that
otherwise require approval or
authorization from a Federal agency for
an action, may be indirectly impacted
by the designation of critical habitat, the
legally binding duty to avoid
destruction or adverse modification of
critical habitat rests squarely on the
Federal agency. Furthermore, to the
extent that non-Federal entities are
indirectly impacted because they
receive Federal assistance or participate
in a voluntary Federal aid program, the
Unfunded Mandates Reform Act would
not apply, nor would critical habitat
shift the costs of the large entitlement
programs listed above onto State
governments.
(2) We do not believe that this rule
will significantly or uniquely affect
small governments because it will not
produce a Federal mandate of $100
million or greater in any year, that is, it
is not a ‘‘significant regulatory action’’
under the Unfunded Mandates Reform
Act. The designation of critical habitat
for the longsolid and round hickorynut
imposes no obligations on State or local
governments. Therefore, a Small
Government Agency Plan is not
required.
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Takings—Executive Order 12630
In accordance with E.O. 12630
(Government Actions and Interference
with Constitutionally Protected Private
Property Rights), we have analyzed the
potential takings implications of
designating critical habitat for the
longsolid and round hickorynut in a
takings implications assessment. The
Act does not authorize us to regulate
private actions on private lands or
confiscate private property as a result of
critical habitat designation. Designation
of critical habitat does not affect land
ownership, or establish any closures, or
restrictions on use of or access to the
designated areas. Furthermore, the
designation of critical habitat does not
affect landowner actions that do not
require Federal funding or permits, nor
does it preclude development of habitat
conservation programs or issuance of
incidental take permits to permit actions
that do require Federal funding or
permits to go forward. However, Federal
agencies are prohibited from carrying
out, funding, or authorizing actions that
would destroy or adversely modify
critical habitat. A takings implications
assessment has been completed and
concludes that this designation of
critical habitat for the longsolid and
round hickorynut does not pose
significant takings implications for
lands within or affected by the
designation.
Federalism—Executive Order 13132
In accordance with E.O. 13132
(Federalism), this rule does not have
significant Federalism effects. A
federalism summary impact statement is
not required. In keeping with
Department of the Interior and
Department of Commerce policy, we
requested information from, and
coordinated development of these
critical habitat designations with,
appropriate State resource agencies.
From a federalism perspective, the
designation of critical habitat directly
affects only the responsibilities of
Federal agencies. The Act imposes no
other duties with respect to critical
habitat, either for States and local
governments, or for anyone else. As a
result, this final rule does not have
substantial direct effects either on the
States, or on the relationship between
the national government and the States,
or on the distribution of powers and
responsibilities among the various
levels of government. The designations
may have some benefit to these
governments because the areas that
contain the features essential to the
conservation of the species are more
clearly defined, and the physical or
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biological features of the habitat
necessary for the conservation of the
species are specifically identified. This
information does not alter where and
what federally sponsored activities may
occur. However, it may assist State and
local governments in long-range
planning because they no longer have to
wait for case-by-case section 7
consultations to occur.
Where State and local governments
require approval or authorization from a
Federal agency for actions that may
affect critical habitat, consultation
under section 7(a)(2) of the Act will be
required. While non-Federal entities
that receive Federal funding, assistance,
or permits, or that otherwise require
approval or authorization from a Federal
agency for an action, may be indirectly
impacted by the designation of critical
habitat, the legally binding duty to
avoid destruction or adverse
modification of critical habitat rests
squarely on the Federal agency.
Civil Justice Reform—Executive Order
12988
In accordance with Executive Order
12988 (Civil Justice Reform), the Office
of the Solicitor has determined that the
rule will not unduly burden the judicial
system and that it meets the
requirements of sections 3(a) and 3(b)(2)
of the Order. We are designating critical
habitat in accordance with the
provisions of the Act. To assist the
public in understanding the habitat
needs of the species, this final rule
identifies the physical or biological
features essential to the conservation of
the species. The designated areas of
critical habitat are presented on maps,
and the rule provides several options for
the interested public to obtain more
detailed location information, if desired.
Paperwork Reduction Act of 1995 (44
U.S.C. 3501 et seq.)
This rule does not contain
information collection requirements,
and a submission to the Office of
Management and Budget (OMB) under
the Paperwork Reduction Act of 1995
(44 U.S.C. 3501 et seq.) is not required.
We may not conduct or sponsor and you
Common name
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*
VerDate Sep<11>2014
National Environmental Policy Act (42
U.S.C. 4321 et seq.)
Regulations adopted pursuant to
section 4(a) of the Act are exempt from
the National Environmental Policy Act
(NEPA; 42 U.S.C. 4321 et seq.) and do
not require an environmental analyses
under NEPA. We published a notice
outlining our reasons for this
determination in the Federal Register
on October 25, 1983 (48 FR 49244). This
includes listing, delisting, and
reclassification rules, as well as critical
habitat designations and speciesspecific protective regulations
promulgated concurrently with a
decision to list or reclassify a species as
threatened. The courts have upheld this
position (e.g., Douglas County v.
Babbitt, 48 F.3d 1495 (9th Cir. 1995)
(critical habitat); Center for Biological
Diversity v. U.S. Fish and Wildlife
Service., 2005 WL 2000928 (N.D. Cal.
Aug. 19, 2005) (concurrent 4(d) rule)).
Government-to-Government
Relationship With Tribes
In accordance with the President’s
memorandum of April 29, 1994
(Government-to-Government Relations
with Native American Tribal
Governments; 59 FR 22951), Executive
Order 13175 (Consultation and
Coordination with Indian Tribal
Governments), and the Department of
the Interior’s manual at 512 DM 2, we
readily acknowledge our responsibility
to communicate meaningfully with
recognized federally recognized Tribes
on a government-to-government basis.
In accordance with Secretarial Order
3206 of June 5, 1997 (American Indian
Tribal Rights, Federal-Tribal Trust
Responsibilities, and the Endangered
Species Act), we readily acknowledge
our responsibilities to work directly
with Tribes in developing programs for
healthy ecosystems, to acknowledge that
Tribal lands are not subject to the same
controls as Federal public lands, to
remain sensitive to Indian culture, and
Scientific name
*
*
Hickorynut, round .............
are not required to respond to a
collection of information unless it
displays a currently valid OMB control
number.
Where listed
*
*
Clams
*
*
Obovaria subrotunda ......
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Status
*
Wherever found ..............
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to make information available to Tribes.
We have determined that no Tribal
lands fall within the boundaries of the
final critical habitat for the longsolid
and round hickorynut, so no Tribal
lands would be affected by the
designations.
References Cited
A complete list of references cited in
this rulemaking is available on the
internet at https://www.regulations.gov
and upon request from the Asheville
Ecological Services Field Office (see FOR
FURTHER INFORMATION CONTACT).
Authors
The primary authors of this final rule
are the staff members of the U.S. Fish
and Wildlife Service’s Species
Assessment Team and the Service’s
Asheville Ecological Services Field
Office.
List of Subjects in 50 CFR Part 17
Endangered and threatened species,
Exports, Imports, Reporting and
recordkeeping requirements,
Transportation, Wildlife.
Regulation Promulgation
Accordingly, we amend part 17,
subchapter B of chapter I, title 50 of the
Code of Federal Regulations, as set forth
below:
PART 17—ENDANGERED AND
THREATENED WILDLIFE AND PLANTS
1. The authority citation for part 17
continues to read as follows:
■
Authority: 16 U.S.C. 1361–1407; 1531–
1544; and 4201–4245, unless otherwise
noted.
2. Amend § 17.11(h) by adding entries
for ‘‘Hickorynut, round’’ and
‘‘Longsolid’’ to the List of Endangered
and Threatened Wildlife in alphabetical
order under CLAMS to read as follows:
■
§ 17.11 Endangered and threatened
wildlife.
*
*
*
(h) * * *
*
Listing citations and applicable rules
*
*
T
*
*
*
*
*
88 FR [Insert Federal Register page where the
document begins], March 9, 2023; 50 CFR
17.45(d); 4d 50 CFR 17.95(f).CH
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Common name
Scientific name
Where listed
*
Longsolid ..........................
*
*
Fusconaia subrotunda ....
*
Wherever found ..............
*
*
*
3. Amend § 17.45 by adding
paragraphs (c) and (d) to read as set
forth below:
■
§ 17.45
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*
*
*
*
*
(c) [Reserved]
(d) Longsolid (Fusconaia subrotunda)
and round hickorynut (Obovaria
subrotunda).
(1) Prohibitions. The following
prohibitions that apply to endangered
wildlife also apply to the longsolid and
round hickorynut. Except as provided
under paragraph (d)(2) of this section
and §§ 17.4 and 17.5, it is unlawful for
any person subject to the jurisdiction of
the United States to commit, to attempt
to commit, to solicit another to commit,
or cause to be committed, any of the
following acts in regard to these species:
(i) Import or export, as set forth at
§ 17.21(b) for endangered wildlife.
(ii) Take, as set forth at § 17.21(c)(1)
for endangered wildlife.
(iii) Possession and other acts with
unlawfully taken specimens, as set forth
at § 17.21(d)(1) for endangered wildlife.
(iv) Interstate or foreign commerce in
the course of commercial activity, as set
forth at § 17.21(e) for endangered
wildlife.
(v) Sale or offer for sale, as set forth
at § 17.21(f) for endangered wildlife.
(2) Exceptions from prohibitions. In
regard to these species, you may:
(i) Conduct activities as authorized by
a permit under § 17.32.
(ii) Take, as set forth at § 17.21(c)(2)
through (c)(4) for endangered wildlife.
(iii) Take, as set forth at § 17.31(b).
(iv) Take incidental to an otherwise
lawful activity caused by:
(A) Conservation and restoration
efforts for listed species conducted by
State wildlife agencies, including, but
not limited to, population monitoring,
relocation, and collection of broodstock;
tissue collection for genetic analysis;
captive propagation; and subsequent
stocking into currently occupied and
unoccupied areas within the historical
range of the species.
(B) Channel and bank restoration
projects that create natural, physically
stable, ecologically functioning streams
(or stream and wetland systems) that are
reconnected with their groundwater
aquifers. These projects can be
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*
Status
Listing citations and applicable rules
*
T
*
*
88 FR [Insert Federal Register page where the
document begins], March 9, 2023; 50 CFR
17.45(d); 4d 50 CFR 17.95(f).CH
*
accomplished using a variety of
methods, but the desired outcome is a
natural channel with low shear stress
(force of water moving against the
channel); bank heights that enable
reconnection to the floodplain; a
reconnection of surface and
groundwater systems, resulting in
perennial flows in the channel; riffles
and pools composed of existing soil,
rock, and wood instead of large
imported materials; low compaction of
soils within adjacent riparian areas; and
inclusion of riparian wetlands.
(C) Bank stabilization projects that use
bioengineering methods to replace preexisting, bare, eroding stream banks
with vegetated, stable stream banks,
thereby reducing bank erosion and
instream sedimentation and improving
habitat conditions for the species.
Following these bioengineering
methods, stream banks may be
stabilized using native species live
stakes (live, vegetative cuttings inserted
or tamped into the ground in a manner
that allows the stake to take root and
grow), native species live fascines (live
branch cuttings, usually willows, bound
together into long, cigar-shaped
bundles), or native species brush
layering (cuttings or branches of easily
rooted tree species layered between
successive lifts of soil fill). Native
species vegetation includes woody and
herbaceous species appropriate for the
region and habitat conditions. These
methods will not include the sole use of
quarried rock (rip-rap) or the use of rock
baskets or gabion structures. Prior to
channel restoration and bank
stabilization actions, surveys conducted
in coordination with the appropriate
Service field office to determine
presence of longsolid and round
hickorynut must be performed, and if
located, relocation prior to project
implementation may be necessary, with
post-implementation monitoring. To
qualify under this exemption, channel
restoration and bank stabilization
actions must satisfy all Federal, State,
and local permitting requirements.
(D) Forest management activities that
implement State-approved best
management practices.
(v) Possess and engage in other acts
with unlawfully taken wildlife, as set
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*
*
forth at § 17.21(d)(2) for endangered
wildlife.
■ 4. Amend § 17.95(f) by adding,
immediately following the entry for
‘‘Carolina Heelsplitter (Lasmigona
decorata),’’ entries for ‘‘Round
Hickorynut (Obovaria subrotunda)’’ and
‘‘Longsolid (Fusconaia subrotunda)’’ to
read as follows:
§ 17.95
Critical habitat—fish and wildlife.
*
*
*
*
*
(f) Clams and Snails.
*
*
*
*
*
Round Hickorynut (Obovaria
subrotunda)
(1) Critical habitat units for the round
hickorynut are depicted on the maps in
this entry for Jackson, Madison, and
Marshall Counties, Alabama; Fulton,
Marshall, Pulaski, and Starke Counties,
Indiana; Bath, Butler, Campbell,
Edmonson, Fleming, Green, Harrison,
Hart, Kenton, Laurel, Morgan, Nicholas,
Pendleton, Pulaski, Rockcastle,
Robertson, Rowan, and Warren
Counties, Kentucky; Montgomery
County, Mississippi; Bedford, Marshall,
and Maury Counties, Tennessee;
Ashtabula, Lake, and Trumbull
Counties, Ohio; Crawford and Mercer
Counties, Pennsylvania; and Braxton,
Calhoun, Clay, Doddridge, Fayette,
Gilmer, Kanawha, Pleasants, Ritchie,
Tyler, and Wood Counties, West
Virginia.
(2) Within these areas, the physical or
biological features essential to the
conservation of the round hickorynut
consist of the following components:
(i) Adequate flows, or a hydrologic
flow regime (magnitude, timing,
frequency, duration, rate of change, and
overall seasonality of discharge over
time), necessary to maintain benthic
habitats where the species is found and
to maintain stream connectivity,
specifically providing for the exchange
of nutrients and sediment for
maintenance of the mussel’s and fish
host’s habitat and food availability,
maintenance of spawning habitat for
native fishes, and the ability for newly
transformed juveniles to settle and
become established in their habitats.
Adequate flows ensure delivery of
oxygen, enable reproduction, deliver
food to filter-feeding mussels, and
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reduce contaminants and fine sediments
from interstitial spaces. Stream velocity
is not static over time, and variations
may be attributed to seasonal changes
(with higher flows in winter/spring and
lower flows in summer/fall), extreme
weather events (e.g., drought or floods),
or anthropogenic influence (e.g., flow
regulation via impoundments).
(ii) Suitable substrates and connected
instream habitats, characterized by
geomorphically stable stream channels
and banks (i.e., channels that maintain
lateral dimensions, longitudinal
profiles, and sinuosity patterns over
time without an aggrading or degrading
bed elevation) with habitats that support
a diversity of freshwater mussel and
native fish (such as, stable riffle-runpool habitats that provide flow refuges
consisting of predominantly silt-free,
stable sand, gravel, and cobble
substrates).
(iii) Water and sediment quality
necessary to sustain natural
physiological processes for normal
behavior, growth, and viability of all life
stages, including (but not limited to):
Dissolved oxygen (generally above 2 to
3 parts per million (ppm)), salinity
(generally below 2 to 4 ppm), and
temperature (generally below 86 °F (°F)
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(30 °Celsius (°C)). Additionally, water
and sediment should be low in
ammonia (generally below 0.5 ppm total
ammonia-nitrogen) and heavy metal
concentrations, and lack excessive total
suspended solids and other pollutants.
(iv) The presence and abundance of
fish hosts necessary for recruitment of
the round hickorynut (i.e., eastern sand
darter (Ammocrypta pellucida), emerald
darter (Etheostoma baileyi), greenside
darter (E. blennioides), Iowa darter (E.
exile), fantail darter (E. flabellare),
Cumberland darter (E. susanae),
spangled darter (E. obama), variegate
darter (E. variatum), blackside darter
(Percina maculata), frecklebelly darter
(P. stictogaster), and banded sculpin
(Cottus carolinae)).
(3) Critical habitat does not include
manmade structures (such as buildings,
aqueducts, runways, roads, and other
paved areas) and the land on which they
are located existing within the legal
boundaries on April 10, 2023.
(4) Data layers defining map units
were created by overlaying Natural
Heritage Element Occurrence data and
U.S. Geological Survey hydrologic data
for stream reaches. The hydrologic data
used in the critical habitat maps were
extracted from the U.S. Geological
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Survey 1:1M scale nationwide
hydrologic layer (https://www.usgs.gov/
core-science-systems/ngp/nationalhydrography) with a projection of
EPSG:4269—NAD83 Geographic.
Natural Heritage program and State
mussel database species presence data
from Pennsylvania, Ohio, Indiana, West
Virginia, Kentucky, Tennessee,
Alabama, and Mississippi were used to
select specific river and stream
segments for inclusion in the critical
habitat layer. The maps in this entry, as
modified by any accompanying
regulatory text, establish the boundaries
of the critical habitat designation. The
coordinates or plot points or both on
which each map is based are available
to the public at the Service’s internet
site at https://www.regulations.gov at
Docket No. FWS–R4–ES–2020–0010,
and at the field office responsible for
this designation. You may obtain field
office location information by
contacting one of the Service regional
offices, the addresses of which are listed
at 50 CFR 2.2.
(5) Index map for the round
hickorynut follows:
Figure 1 to Round Hickorynut (Obovaria
subrotunda) paragraph (5)
BILLING CODE 4333–15–P
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(6) Unit RH 1: Shenango River;
Crawford and Mercer Counties,
Pennsylvania.
(i) Unit RH 1 consists of 22 river miles
(mi) (35.5 kilometers (km)) of the
Shenango River in Crawford County,
Pennsylvania, from Pymatuning Dam
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downstream to the point of inundation
by Shenango River Lake near Big Bend,
Mercer County, Pennsylvania.
Approximately 15 river mi (24.3 km; 68
percent) of riparian lands that border
the unit are private ownership, and 7
river mi (11.1 km; 32 percent) are public
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14841
(Federal or State) ownership. This unit
is immediately downstream from
Pymatuning Dam, which is owned by
the State of Pennsylvania.
(ii) Map of Unit RH 1 follows:
Figure 2 to Round Hickorynut (Obovaria
subrotunda) paragraph (6)(ii)
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(7) Unit RH 2: Grand River;
Ashtabula, Lake, and Trumbull
Counties, Ohio.
(i) Unit RH 2 consists of 92 river mi
(148.2 km) of the Grand River in
Ashtabula, Lake, and Trumbull
Counties, Ohio. Approximately 59 river
mi (95.2 km; 64 percent) of riparian
lands that border the unit are private
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ownership, and 33 river mi (53 km; 36
percent) are public (State or local)
ownership. The Grand River is a State
Wild and Scenic River. The Wild River
designation includes approximately 23
river mi (37 km) from the Harpersfield
Covered Bridge downstream to the
Norfolk and Western Railroad Trestle in
Lake County, and approximately 33 mi
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(53 km) from the U.S. Route 322 Bridge
in Ashtabula County downstream to the
Harpersfield Covered Bridge.
Harpersfield Dam within this unit is
operated by the U.S. Army Corps of
Engineers.
(ii) Map of Unit RH 2 follows:
Figure 3 to Round Hickorynut (Obovaria
subrotunda) paragraph (7)(ii)
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14842
(8) Unit RH 3: Tippecanoe River;
Fulton, Marshall, Pulaski, and Starke
Counties, Indiana.
(i) Unit RH 3 consists of 75 river mi
(120.8 km) of the Tippecanoe River in
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Fulton, Marshall, Pulaski, and Starke
Counties, Indiana. Approximately 66
river mi (105.6 km; 89 percent) of
riparian lands that border the unit are
private ownership, and 9 river mi (14.5
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14843
km; 11 percent) are public (State or
easement) ownership.
(ii) Map of Unit RH 3 follows:
Figure 4 to Round Hickorynut (Obovaria
subrotunda) paragraph (8)(ii)
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(9) Unit RH 4: Middle Island Creek;
Doddridge, Pleasants, and Tyler
Counties, West Virginia.
(i) Unit RH 4 consists of 75 stream mi
(120.8 km) of Middle Island Creek in
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Doddridge, Pleasants, and Tyler
Counties, West Virginia. Approximately
74.8 stream mi (120.4 km; 99 percent) of
riparian lands that border the unit are
private ownership, and 0.2 stream mi
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(0.4 km; less than 1 percent) is public
ownership.
(ii) Map of Unit RH 4 follows:
Figure 5 to Round Hickorynut (Obovaria
subrotunda) paragraph (9)(ii)
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14844
(10) Unit RH 5: Little Kanawha River;
Calhoun, Gilmer, Ritchie, and Wood
Counties, West Virginia.
(i) Unit RH 5 consists of 110 stream
mi (176.6 km) of the Little Kanawha
River in Calhoun, Gilmer, Ritchie, and
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Wood Counties, West Virginia.
Approximately 109 river mi (175.4 km;
99 percent) of riparian lands that border
the unit are private ownership, and 0.7
river mi (1.2 km; 1 percent) are public
(Federal, State, or local) ownership.
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14845
This unit is directly below Burnsville
Dam, which is operated by the U.S.
Army Corps of Engineers.
(ii) Map of Unit RH 5 follows:
Figure 6 to Round Hickorynut (Obovaria
subrotunda) paragraph (10)(ii)
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(11) Unit RH 6: Elk River; Braxton,
Clay, and Kanawha Counties, West
Virginia.
(i) Unit RH 6 consists of 101 river mi
(163 km) of the Elk River in Braxton,
Clay, and Kanawha Counties, West
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Virginia. Approximately 93 river mi
(150.3 km; 92 percent) of riparian lands
that border the unit are private
ownership, and 7 river mi (12.7 km; 8
percent) are public (Federal, State, or
local) ownership. This unit is
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immediately below Sutton Dam, which
is operated by the U.S. Army Corps of
Engineers.
(ii) Map of Unit RH 6 follows:
Figure 7 to Round Hickorynut (Obovaria
subrotunda) paragraph (11)(ii)
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14846
(12) Unit RH 7: Kanawha River;
Fayette and Kanawha Counties, West
Virginia.
(i) Unit RH 7 consists of 37.5 river mi
(60.4 km) of the Kanawha River in
Fayette and Kanawha Counties, West
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Virginia. Approximately 33 river mi
(53.2 km; 90 percent) of riparian lands
that border the unit are private
ownership, and 4 river mi (7.2 km; 10
percent) are public (Federal, State, or
local) ownership. London and Marmet
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14847
locks and dams within this unit are
operated by the U.S. Army Corps of
Engineers.
(ii) Map of Unit RH 7 follows:
Figure 8 to Round Hickorynut (Obovaria
subrotunda) paragraph (12)(ii)
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(13) Unit RH 8: Licking River; Bath,
Campbell, Fleming, Harrison, Kenton,
Morgan, Nicholas, Pendleton,
Robertson, and Rowan Counties,
Kentucky.
(i) Unit RH 8 consists of 150 river mi
(241.9 km) of the Licking River in Bath,
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Campbell, Fleming, Harrison, Kenton,
Morgan, Nicholas, Pendleton,
Robertson, and Rowan Counties,
Kentucky. Approximately 131 river mi
(211.8 km; 87 percent) of riparian lands
that border the unit are private
ownership, and 18 river mi (30 km; 13
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percent) are public (Federal, State, or
local) ownership. This unit is directly
below Cave Run Dam, which is operated
by the U.S. Army Corps of Engineers.
(ii) Map of Unit RH 8 follows:
Figure 9 to Round Hickorynut (Obovaria
subrotunda) paragraph (13)(ii)
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14848
(14) Unit RH 9: Rockcastle River;
Laurel, Pulaski, and Rockcastle
Counties, Kentucky.
(i) Unit RH 9 consists of 15.3 river mi
(24.6 km) of the Rockcastle River in
Laurel, Pulaski, and Rockcastle
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Counties, Kentucky. Approximately 0.3
river mi (0.4 km; 1 percent) of riparian
lands that border the unit is private
ownership, and 15 river mi (24.2 km; 99
percent) are public (Federal; Daniel
Boone National Forest) ownership.
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14849
(ii) Map of Unit RH 9 follows:
Figure 10 to Round Hickorynut
(Obovaria subrotunda) paragraph
(14)(ii)
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(15) Unit RH 10: Buck Creek; Pulaski
County, Kentucky.
(i) Unit RH 10 consists of 36 stream
mi (58.1 km) of Buck Creek in Pulaski
County, Kentucky. Approximately 33
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stream mi (52.6 km; 92 percent) of
riparian lands that border the unit are
private ownership, and 3 stream mi (5.5
km; 8 percent) are public (State or local)
ownership.
PO 00000
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(ii) Map of Unit RH 10 follows:
Figure 11 to Round Hickorynut
(Obovaria subrotunda) paragraph
(15)(ii)
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14850
(16) Unit RH 11: Green River; Hart,
Edmonson, Green, Butler, and Warren
Counties, Kentucky.
(i) Unit RH 11 consists of 98 river mi
(157.7 km) of the Green River in Butler,
Edmonson, Green, Hart, and Warren
Counties, Kentucky. Approximately 61
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river mi (98.4 km; 62 percent) of
riparian lands that border the unit are
private ownership, and 37 river mi (59.4
km; 38 percent) are public (Federal or
State) ownership, including portions of
Mammoth Cave National Park. This unit
is located directly below Green River
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Lake Dam, which is operated by the U.S.
Army Corps of Engineers.
(ii) Map of Unit RH 11 follows:
Figure 12 to Round Hickorynut
(Obovaria subrotunda) paragraph
(16)(ii)
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(17) Unit RH 12: Paint Rock River;
Jackson, Madison, and Marshall
Counties, Alabama.
(i) Unit RH 12 consists of 48 river mi
(77.5 km) of the Paint Rock River in
Jackson, Madison, and Marshall
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Counties, Alabama. Approximately 2
river mi (4.1 km; 2 percent) of riparian
lands that border the unit are private
ownership, and 46 river mi (73.4 km; 98
percent) are public (Federal or State)
ownership.
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(ii) Map of Unit RH 12 follows:
Figure 13 to Round Hickorynut
(Obovaria subrotunda) paragraph
(17)(ii)
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14852
(18) Unit RH 13: Duck River; Bedford,
Marshall, and Maury Counties,
Tennessee.
(i) Unit RH 13 consists of 59 river mi
(94.8 km) of the Duck River in Bedford,
Marshall, and Maury Counties,
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Tennessee. Approximately 27 river mi
(43.7 km; 47 percent) of riparian lands
that border the unit are private
ownership, and 32 river mi (51.1 km; 53
percent) are public (State or local)
ownership.
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(ii) Map of Unit RH 13 follows:
Figure 14 to Round Hickorynut
(Obovaria subrotunda) paragraph
(18)(ii)
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(19) Unit RH 14: Big Black River;
Montgomery County, Mississippi.
(i) Unit RH 14 consists of 4 river mi
(7 km) of the Big Black River in
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Montgomery County, Mississippi. All of
riparian lands that border the unit are
private ownership.
(ii) Map of Unit RH 14 follows:
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Figure 15 to Round Hickorynut
(Obovaria subrotunda) paragraph
(19)(ii)
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Longsolid (Fusconaia subrotunda)
(1) Critical habitat units for the
longsolid are depicted on the maps in
this entry for Jackson, Madison, and
Marshall Counties, Alabama; Bath,
Butler, Campbell, Edmonson, Fleming,
Green, Harrison, Hart, Kenton, Morgan,
Nicholas, Pendleton, Robertson, Rowan,
Taylor, and Warren Counties, Kentucky;
Clarion, Crawford, Erie, Forest, Mercer,
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Venango, and Warren Counties,
Pennsylvania; Claiborne, Hancock,
Hawkins, Smith, Trousdale, and Wilson
Counties, Tennessee; Russell, Scott,
Tazewell, and Wise Counties, Virginia;
and Braxton, Calhoun, Clay, Doddridge,
Fayette, Gilmer, Kanawha, Ritchie,
Tyler, and Wood Counties, West
Virginia.
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(2) Within these areas, the physical or
biological features essential to the
conservation of the longsolid consist of
the following components:
(i) Adequate flows, or a hydrologic
flow regime (magnitude, timing,
frequency, duration, rate of change, and
overall seasonality of discharge over
time), necessary to maintain benthic
habitats where the species is found and
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to maintain stream connectivity,
specifically providing for the exchange
of nutrients and sediment for
maintenance of the mussel’s and fish
host’s habitat and food availability,
maintenance of spawning habitat for
native fishes, and the ability for newly
transformed juveniles to settle and
become established in their habitats.
Adequate flows ensure delivery of
oxygen, enable reproduction, deliver
food to filter-feeding mussels, and
reduce contaminants and fine sediments
from interstitial spaces. Stream velocity
is not static over time, and variations
may be attributed to seasonal changes
(with higher flows in winter/spring and
lower flows in summer/fall), extreme
weather events (e.g., drought or floods),
or anthropogenic influence (e.g., flow
regulation via impoundments).
(ii) Suitable substrates and connected
instream habitats, characterized by
geomorphically stable stream channels
and banks (i.e., channels that maintain
lateral dimensions, longitudinal
profiles, and sinuosity patterns over
time without an aggrading or degrading
bed elevation) with habitats that support
a diversity of freshwater mussel and
native fish (such as, stable riffle-runpool habitats that provide flow refuges
consisting of predominantly silt-free,
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stable sand, gravel, and cobble
substrates).
(iii) Water and sediment quality
necessary to sustain natural
physiological processes for normal
behavior, growth, and viability of all life
stages, including (but not limited to):
Dissolved oxygen (generally above 2 to
3 parts per million (ppm)), salinity
(generally below 2 to 4 ppm), and
temperature (generally below
86 °Fahrenheit (°F) (30 °Celsius (°C)).
Additionally, water and sediment
should be low in ammonia (generally
below 0.5 ppm total ammonia-nitrogen)
and heavy metal concentrations, and
lack excessive total suspended solids
and other pollutants.
(iv) The presence and abundance of
fish hosts necessary for recruitment of
the longsolid (currently unknown, likely
includes the minnows of the family
Cyprinidae and banded sculpin (Cottus
carolinae)).
(3) Critical habitat does not include
manmade structures (such as buildings,
aqueducts, runways, roads, and other
paved areas) and the land on which they
are located existing within the legal
boundaries on April 10, 2023.
(4) Data layers defining map units
were created by overlaying Natural
Heritage Element Occurrence data and
U.S. Geological Survey hydrologic data
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for stream reaches. The hydrologic data
used in the critical habitat maps were
extracted from the U.S. Geological
Survey 1:1M scale nationwide
hydrologic layer (https://www.usgs.gov/
core-science-systems/ngp/nationalhydrography) with a projection of
EPSG:4269—NAD83 Geographic.
Natural Heritage program and State
mussel database species presence data
from Pennsylvania, West Virginia,
Virginia, Kentucky, Tennessee, and
Alabama were used to select specific
river and stream segments for inclusion
in the critical habitat layer. The maps in
this entry, as modified by any
accompanying regulatory text, establish
the boundaries of the critical habitat
designation. The coordinates or plot
points or both on which each map is
based are available to the public at the
Service’s internet site at https://
www.regulations.gov at Docket No.
FWS–R4–ES–2020–0010, and at the
field office responsible for this
designation. You may obtain field office
location information by contacting one
of the Service regional offices, the
addresses of which are listed at 50 CFR
2.2.
(5) Index map for the longsolid
follows:
Figure 1 to Longsolid (Fusconaia
subrotunda) paragraph (5)
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(6) Unit LS 1: French Creek; Crawford,
Erie, Mercer, and Venango Counties,
Pennsylvania.
(i) Unit LS 1 consists of 120 stream mi
(191.5 km) of French Creek in Crawford,
Erie, Mercer, and Venango Counties,
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Pennsylvania. Approximately 106
stream mi (170.6 km; 76 percent) of
riparian lands that border the unit are
private ownership, and 14 stream mi
(22.1 km; 24 percent) are public (Federal
or State) ownership. This unit begins
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14857
immediately downstream of the Union
City Dam, which is operated by the U.S.
Army Corps of Engineers.
(ii) Map of Unit LS 1 follows:
Figure 2 to Longsolid (Fusconaia
subrotunda) paragraph (6)(ii)
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(7) Unit LS 2: Allegheny River;
Clarion, Crawford, Forest, Venango, and
Warren Counties, Pennsylvania.
(i) Unit LS 2 consists of 99 river mi
(159.3 km) of the Allegheny River in
Clarion, Crawford, Forest, Venango, and
Warren Counties, Pennsylvania.
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Approximately 15 river mi (24.1 km; 14
percent) of riparian lands that border
the unit are private ownership, and 84
river mi (135.8 km; 86 percent) are
public (Federal or State; primarily
Allegheny National Forest) ownership.
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This unit is immediately downstream of
Kinzua Dam, which is operated by the
U.S. Army Corps of Engineers.
(ii) Map of Unit LS 2 follows:
Figure 3 to Longsolid (Fusconaia
subrotunda) paragraph (7)(ii)
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14858
(8) Unit LS 3: Shenango River;
Crawford and Mercer Counties,
Pennsylvania.
(i) Unit LS 3 consists of 22 river miles
(mi) (35.5 kilometers (km)) of the
Shenango River in Crawford County,
Pennsylvania, from Pymatuning Dam
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downstream to the point of inundation
by Shenango River Lake near Big Bend,
Mercer County, Pennsylvania.
Approximately 15 river mi (24.3 km; 68
percent) of riparian lands that border
the unit are private ownership, and 7
river mi (11.3 km; 32 percent) are public
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14859
(Federal or State) ownership. This unit
is immediately downstream from the
Pymatuning Dam, which is owned by
the State of Pennsylvania.
(ii) Map of Unit LS 3 follows:
Figure 4 to Longsolid (Fusconaia
subrotunda) paragraph (8)(ii)
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(9) Unit LS 4: Middle Island Creek;
Doddridge and Tyler Counties, West
Virginia.
(i) Unit LS 4 consists of 14 stream mi
(23.7 km) of Middle Island Creek in
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Doddridge and Tyler Counties, West
Virginia. Approximately 14 stream mi
(23.5 km; 99 percent) of riparian lands
that border the unit are private
ownership, and 0.1 stream mi (0.2 km;
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less than 1 percent) are public (local)
ownership.
(ii) Map of Unit LS 4 follows:
Figure 5 to Longsolid (Fusconaia
subrotunda) paragraph (9)(ii)
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14860
(10) Unit LS 5: Little Kanawha River;
Calhoun, Gilmer, Ritchie, and Wood
Counties, West Virginia.
(i) Unit LS 5 consists of 123 river mi
(198 km) of the Little Kanawha River in
Calhoun, Gilmer, Ritchie, and Wood
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Counties, West Virginia. Approximately
122 river mi (197.2 km; 99 percent) are
private ownership, and 0.53 river mi
(0.9 km; 1 percent) are public (Federal
or State) ownership. This unit is directly
below the Burnsville Dam, which is
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14861
operated by the U.S. Army Corps of
Engineers.
(ii) Map of Unit LS 5 follows:
Figure 6 to Longsolid (Fusconaia
subrotunda) paragraph (10)(ii)
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(11) Unit LS 6: Elk River; Braxton,
Clay, and Kanawha Counties, West
Virginia.
(i) Unit LS 6 consists of 101 river mi
(163 km) of the Elk River in Braxton,
Clay, and Kanawha Counties, West
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Virginia. Approximately 93 river mi
(150.3 km; 92 percent) of riparian lands
that border the unit are private
ownership, and 7 river mi (12.7 km; 8
percent) are public (Federal, State, or
local) ownership. This unit is directly
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below Sutton Dam, which is operated by
the U.S. Army Corps of Engineers.
(ii) Map of Unit LS 6 follows:
Figure 7 to Longsolid (Fusconaia
subrotunda) paragraph (11)(ii)
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(12) Unit LS 7: Kanawha River;
Fayette and Kanawha Counties, West
Virginia.
(i) Unit LS 7 consists of 21 river mi
(33.9 km) of the Kanawha River in
Fayette and Kanawha Counties, West
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Virginia. Approximately 18 river mi
(29.3 km; 90 percent) of riparian lands
that border the unit are private
ownership, and 2 river mi (4.6 km; 10
percent) are public (Federal, State, or
local) ownership. London and Marmet
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14863
locks and dams within this unit are
operated by the U.S. Army Corps of
Engineers.
(ii) Map of Unit LS 7 follows:
Figure 8 to Longsolid (Fusconaia
subrotunda) paragraph (12)(ii)
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(13) Unit LS 8: Licking River; Bath,
Campbell, Fleming, Harrison, Kenton,
Morgan, Nicholas, Pendleton,
Robertson, and Rowan Counties,
Kentucky.
(i) Unit LS 8 consists of 181 river mi
(291.5 km) of the Licking River in Bath,
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Campbell, Fleming, Harrison, Kenton,
Morgan, Nicholas, Pendleton,
Robertson, and Rowan Counties,
Kentucky. Approximately 161 river mi
(259.7 km; 90 percent) of riparian lands
that border the unit are private
ownership, and 19 river mi (31.7 km; 10
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percent) are public (Federal, State, or
local) ownership. This unit is directly
below Cave Run Dam, which is operated
by the U.S. Army Corps of Engineers.
(ii) Map of Unit LS 8 follows:
Figure 9 to Longsolid (Fusconaia
subrotunda) paragraph (13)(ii)
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14864
(14) Unit LS 9: Green River; Butler,
Edmonson, Green, Hart, Taylor, and
Warren Counties, Kentucky.
(i) Unit LS 9 consists of 156 river mi
(251.6 km) of the Green River in Butler,
Edmonson, Green, Hart, Taylor, and
Warren Counties, Kentucky.
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Approximately 105 river mi (169.2 km;
67 percent) of riparian lands that border
the unit are private ownership, and 51
river mi (82.4 km; 33 percent) are public
(Federal, State, or local) ownership,
including Mammoth Cave National
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14865
Park. This unit is directly below Green
River Dam, which is operated by the
U.S. Army Corps of Engineers.
(ii) Map of Unit LS 9 follows:
Figure 10 to Longsolid (Fusconaia
subrotunda) paragraph (14)(ii)
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(15) Unit LS 10: Cumberland River;
Smith, Trousdale, and Wilson Counties,
Tennessee.
(i) Unit LS 10 consists of 48 river mi
(77.5 km) of the Cumberland River in
Smith, Trousdale, and Wilson Counties,
Tennessee. All riparian lands that
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border the river are owned by the U.S.
Army Corps of Engineers (Federal; 48
river mi (77.5 km)). This unit also falls
within the Tennessee Wildlife
Resources Agency’s Rome Landing
Sanctuary. Cordell Hull and Old
Hickory Dams, upstream and
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downstream of this unit, respectively,
are operated by the U.S. Army Corps of
Engineers.
(ii) Map of Unit LS 10 follows:
Figure 11 to Longsolid (Fusconaia
subrotunda) paragraph (15)(ii)
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14866
(16) Unit LS 11: Clinch River; Russell,
Scott, Tazewell, and Wise Counties,
Virginia; Claiborne, Hancock, and
Hawkins Counties, Tennessee.
(i) Unit LS 11 consists of 177 river mi
(286.1 km) of the Clinch River in
Russell, Scott, Tazewell, and Wise
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Counties, Virginia, and Claiborne,
Hancock, and Hawkins Counties,
Tennessee. Approximately 160 river mi
(258.8 km; 90 percent) of riparian lands
that border the unit are private
ownership, and 17 river mi (27.3 km; 10
percent) are public (Federal or State)
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14867
ownership. The Tennessee portion of
this unit is encompassed by the
Tennessee Wildlife Resources Agency’s
Clinch River Sanctuary.
(ii) Map of Unit LS 11 follows:
Figure 12 to Longsolid (Fusconaia
subrotunda) paragraph (16)(ii)
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(17) Unit LS 12: Paint Rock River;
Jackson, Madison, and Marshall
Counties, Alabama.
(i) Unit LS 12 consists of 58 river mi
(94.5 km) of the Paint Rock River in
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Jackson, Madison, and Marshall
Counties, Alabama. Approximately 2
river mi (4.1 km; 3 percent) of riparian
lands that border the unit are private
ownership, and 56 river mi (90.4 km; 97
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percent) are public (Federal or State)
ownership.
(ii) Map of Unit LS 12 follows:
Figure 13 to Longsolid (Fusconaia
subrotunda) paragraph (17)(ii)
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*
*
*
*
Martha Williams,
Director, U.S. Fish and Wildlife Service.
[FR Doc. 2023–03998 Filed 3–8–23; 8:45 am]
BILLING CODE 4333–15–C
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*
14869
Agencies
[Federal Register Volume 88, Number 46 (Thursday, March 9, 2023)]
[Rules and Regulations]
[Pages 14794-14869]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2023-03998]
[[Page 14793]]
Vol. 88
Thursday,
No. 46
March 9, 2023
Part III
Department of the Interior
-----------------------------------------------------------------------
Fish and Wildlife Service
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50 CFR Part 17
Endangered and Threatened Wildlife and Plants; Threatened Species
Status With Section 4(d) Rule for Longsolid and Round Hickorynut and
Designation of Critical Habitat; Final Rule
Federal Register / Vol. 88 , No. 46 / Thursday, March 9, 2023 / Rules
and Regulations
[[Page 14794]]
-----------------------------------------------------------------------
DEPARTMENT OF THE INTERIOR
Fish and Wildlife Service
50 CFR Part 17
[Docket No. FWS-R4-ES-2020-0010; FF09E21000 FXES1111090FEDR 234]
RIN 1018-BD32
Endangered and Threatened Wildlife and Plants; Threatened Species
Status With Section 4(d) Rule for Longsolid and Round Hickorynut and
Designation of Critical Habitat
AGENCY: Fish and Wildlife Service, Interior.
ACTION: Final rule.
-----------------------------------------------------------------------
SUMMARY: We, the U.S. Fish and Wildlife Service (Service), determine
threatened species status under the Endangered Species Act of 1973
(Act), as amended, for the longsolid (Fusconaia subrotunda) and round
hickorynut (Obovaria subrotunda), freshwater mussels. We also designate
critical habitat for both species. For the longsolid, in total,
approximately 1,115 river miles (1,794 river kilometers) fall within 12
units of critical habitat in Pennsylvania, Kentucky, West Virginia,
Virginia, Tennessee, and Alabama. For the round hickorynut, in total,
approximately 921 river miles (1,482 river kilometers) fall within 14
units of critical habitat in Pennsylvania, Ohio, Indiana, Kentucky,
West Virginia, Tennessee, Alabama, and Mississippi. We also finalize a
rule under the authority of section 4(d) of the Act for both species
that provides measures that are necessary and advisable to provide for
the conservation of these species.
DATES: This rule is effective April 10, 2023.
ADDRESSES: This final rule is available on the internet at https://www.regulations.gov. Comments and materials we received are available
for public inspection at https://www.regulations.gov at Docket No. FWS-
R4-ES-2020-0010.
Supporting materials we used in preparing this rule, such as the
species status assessment reports and supporting information that we
developed for the critical habitat designation, are available at
https://www.regulations.gov at Docket No. FWS-R4-ES-2020-0010. For the
critical habitat designation, the coordinates or plot points or both
from which the maps are generated are included in the decision file and
are available at https://www.regulations.gov at Docket No. FWS-R4-ES-
2020-0010, and on the Service's Environmental Conservation Online
System (ECOS) website at https://ecos.fws.gov/ecp/species/9880 and
https://ecos.fws.gov/ecp/species/9879.
FOR FURTHER INFORMATION CONTACT: Janet Mizzi, Field Supervisor, U.S.
Fish and Wildlife Service, Asheville Ecological Services Field Office,
160 Zillicoa St., Asheville, NC 28801; telephone 828-258-3939.
Individuals in the United States who are deaf, deafblind, hard of
hearing, or have a speech disability may dial 711 (TTY, TDD, or
TeleBraille) to access telecommunications relay services. Individuals
outside the United States should use the relay services offered within
their country to make international calls to the point-of-contact in
the United States.
SUPPLEMENTARY INFORMATION:
Executive Summary
Why we need to publish a rule. Under the Act, a species warrants
listing if it meets the definition of an endangered species (in danger
of extinction throughout all or a significant portion of its range) or
a threatened species (likely to become endangered within the
foreseeable future throughout all or a significant portion of its
range). If we determine that a species warrants listing, we must list
the species promptly and designate the species' critical habitat to the
maximum extent prudent and determinable. We have determined that the
longsolid and round hickorynut meet the definition of threatened
species; therefore, we are listing them as such and finalizing a
designation of their critical habitat. Both listing a species as an
endangered or threatened species and designating critical habitat can
be completed only by issuing a rule through the Administrative
Procedure Act rulemaking process (5 U.S.C. 551 et seq.).
What this document does. This rule lists the longsolid and round
hickorynut as threatened species, and issues regulations under section
4(d) of the Act (a ``4(d) rule'') for the conservation of both species.
This rule designates critical habitat for the longsolid in 12 units
totaling approximately 1,115 river miles (mi) (1,794 river kilometers
(km)) within portions of 7 counties in Pennsylvania, 16 counties in
Kentucky, 10 counties in West Virginia, 4 counties in Virginia, 6
counties in Tennessee, and 3 counties in Alabama. Additionally, this
rule designates critical habitat for the round hickorynut in 14 units
totaling approximately 921 river mi (1,482 river km) within portions of
2 counties in Pennsylvania, 3 counties in Ohio, 4 counties in Indiana,
18 counties in Kentucky, 11 counties in West Virginia, 3 counties in
Tennessee, 3 counties in Alabama, and 1 county in Mississippi.
The basis for our action. Under the Act, we may determine that a
species is an endangered or threatened species based on any of five
factors: (A) The present or threatened destruction, modification, or
curtailment of its habitat or range; (B) overutilization for
commercial, recreational, scientific, or educational purposes; (C)
disease or predation; (D) the inadequacy of existing regulatory
mechanisms; or (E) other natural or manmade factors affecting its
continued existence. We have determined that the longsolid and round
hickorynut are threatened species due to the following threats: habitat
degradation or loss (Factor A) from a variety of sources (e.g., dams
and other barriers, resource extraction); degraded water quality from
chemical contamination and erosion from development, agriculture,
mining, and forest conversion (Factor A); direct mortality from
dredging (Factor E); residual impacts (reduced population size) from
historical harvest (Factor B); and the proliferation of invasive,
nonnative species (Factor E). These threats also contribute to the
negative effects associated with the species' small population sizes
(Factor E).
Section 4(a)(3) of the Act requires the Secretary of the Interior
(Secretary) to designate critical habitat concurrent with listing to
the maximum extent prudent and determinable. Section 3(5)(A) of the Act
defines critical habitat as (i) the specific areas within the
geographical area occupied by the species, at the time it is listed, on
which are found those physical or biological features (I) essential to
the conservation of the species and (II) which may require special
management considerations or protections; and (ii) specific areas
outside the geographical area occupied by the species at the time it is
listed, upon a determination by the Secretary that such areas are
essential for the conservation of the species. Section 4(b)(2) of the
Act states that the Secretary must make the designation on the basis of
the best scientific data available and after taking into consideration
the economic impact, the impact on national security, and any other
relevant impacts of specifying any particular area as critical habitat.
Previous Federal Actions
Please refer to the proposed listing and critical habitat rule (85
FR 61384) for the longsolid and round hickorynut published on September
29, 2020, for a
[[Page 14795]]
detailed description of previous Federal actions concerning these
species.
Peer Review
A species status assessment (SSA) team prepared SSA reports for the
longsolid and round hickorynut. The SSA team was composed of Service
biologists, in consultation with other species experts. The SSA reports
represent a compilation of the best scientific and commercial data
available concerning the status of each of the species, including the
impacts of past, present, and future factors (both negative and
beneficial) affecting them.
In accordance with our joint policy on peer review published in the
Federal Register on July 1, 1994 (59 FR 34270), and our August 22,
2016, memorandum updating and clarifying the role of peer review of
listing actions under the Act, we solicited independent scientific
review of the information contained in the SSA reports. As discussed in
the proposed rule, we sent the SSA reports to 10 independent peer
reviewers on both the longsolid and round hickorynut and received 3
responses on the longsolid SSA report, and no responses on the round
hickorynut SSA report. The peer reviews for the longsolid SSA report
can be found at https://www.regulations.gov at Docket No. FWS-R4-ES-
2020-0010. In preparing the proposed rule, we incorporated the results
of these reviews, as appropriate; both SSA reports were the foundation
for the proposed rule and this final rule. A summary of the peer review
comments and our responses can be found in the Peer Reviewer Comments
section of this final rule.
Summary of Changes From the Proposed Rule
This final rule incorporates several changes from what was
contained in our proposed rule (85 FR 61384; September 29, 2020) based
on the comments we received during the comment period. Minor,
nonsubstantive changes and corrections were made throughout this rule
and in the SSA reports in response to comments (e.g., updated range map
for round hickorynut based on survey information in Ohio, revised
forest conversion section in the discussion of threats). The
information we received during the comment period did not change our
determination that the longsolid and round hickorynut are threatened
species.
We received substantive comments on the proposed listing and
proposed 4(d) rule (see Summary of Comments and Recommendations,
below), and we made changes as follows:
We received comments from multiple State agencies across
the ranges of the longsolid and round hickorynut. The State agencies
generally concurred with our methods and conclusions, and provided
additional information, clarifications, and suggestions associated with
threats to the longsolid and round hickorynut. Minor edits associated
with threats and their association with populations in West Virginia
have been incorporated into the preamble of this rule, and additional
citations have been added to support statements regarding contaminants
and resource extraction and their effects on stream habitats and
macroinvertebrates. These added citations are Pond et al. (2008) and
Entrekin et al. (2015). Additionally, special management
recommendations for the nonnative round goby (Neogobius melanostomus)
have been incorporated into the discussion of the longsolid's French
Creek critical habitat unit (Unit LS 1) in Pennsylvania.
We received comments requesting clarification of
broodstocking activities as they relate to the 4(d) exception
associated with conservation and restoration efforts by State wildlife
agencies. Accordingly, the first exception for incidental take
associated for both species' 4(d) rules clarifies this activity
includes population monitoring, relocation, and collection of
broodstock; tissue collection for genetic analysis; captive
propagation; and subsequent stocking into currently occupied and
unoccupied areas within both species' historical ranges.
We received comments requesting clarification on the third
exception in the 4(d) rule for bank restoration projects that use
bioengineering methods to reduce bank erosion and instream
sedimentation and improve habitat conditions for both species.
Specifically, the commenter indicated, and we agree, that this
exception should be referred to as bank stabilization projects, which
may include channel restoration activities, and relocation of mussels
prior to implementation of these types of projects may be (as opposed
to must be) necessary. Accordingly, this exception of the 4(d) rule
reflects these changes.
Several commenters indicated that the Service should
consider forest management best management practices (BMPs; i.e.,
practices that reduce the amount of nonpoint pollution from forest
management) as part of the overall conservation benefit for the
species, account for these beneficial actions in any threat analysis,
and incorporate an associated exception into the 4(d) rules for both
species. Additionally, Warrington et al. (2017) was described as being
cited erroneously in the proposed rule's preamble. Forested watersheds
contribute to the current condition of each species and have been
factored in as a positive factor (i.e., benefit) in the SSAs and
proposed rule. State-approved forest management BMPs vary across the
large geographic areas occupied by the longsolid and round hickorynut,
but we support and encourage their use throughout the species' ranges.
Accordingly, this final rule includes an exception to the prohibitions
in both species' 4(d) rules for State-approved forest management BMPs
in response to public comments we received on the proposed rule.
We also note that forestry activities were not a primary threat in
our current and future condition analyses, and that the conversion of
forested habitats to other land uses, such as agriculture or urban
development, contribute to greater habitat and water quality
degradation than forest management. Clarity regarding forest conversion
to other land uses, not forestry, and its contribution to freshwater
mussel habitat degradation and loss has been incorporated into the
preamble of this rule. Several populations of the longsolid and round
hickorynut occur on U.S. Forest Service lands; therefore, any actions
that may affect these populations are subject to section 7 consultation
under the Act (16 U.S.C. 1531 et seq.).
This rule does not make any changes to the boundaries of the
proposed critical habitat designation for either species based on
public comments we received.
I. Final Listing Determination
Background
Please refer to the September 29, 2020, proposed rule (85 FR 61384)
and the SSA reports for full summaries of species information. These
documents are available at https://www.regulations.gov under Docket No.
FWS-R4-ES-2020-0010, and on the ECOS website at https://ecos.fws.gov/ecp/species/9880 and https://ecos.fws.gov/ecp/species/9879.
The longsolid (Fusconaia subrotunda) is a freshwater river mussel
belonging to the Unionidae family, also known as the naiads and pearly
mussels. Longsolid adults are light brown in color, darkening with age.
The shell is thick and medium-sized (up to 5 inches (in) (125
millimeters (mm)), and typically has a dull sheen (Williams et al.
2008, p. 322). There is variability in the inflation of the shell
depending on population and latitudinal location
[[Page 14796]]
(Ortmann 1920, p. 272; Watters et al. 2009, p. 130).
The longsolid is currently found in the Ohio, Cumberland, and
Tennessee River basins, overlapping within the States of Alabama,
Kentucky, New York, North Carolina, Ohio, Pennsylvania, Tennessee,
Virginia, and West Virginia (Service 2018, appendix A; see figure 1,
below). It is considered extirpated from Georgia, Indiana, and
Illinois.
Additionally, it is classified as an endangered species by the
State of Ohio, and considered to have various levels of concern,
imperilment, or vulnerability (see table 1-1 in the SSA report) by the
States of Alabama, Kentucky, North Carolina, Pennsylvania, Tennessee,
Virginia, and West Virginia.
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[[Page 14797]]
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Similar to the longsolid, the round hickorynut also belongs to the
Unionidae family of naiads and pearly mussels. Round hickorynut adult
mussels are greenish-olive to dark or chestnut brown, sometimes
blackish in older individuals, and may have a yellowish band dorsally
(Parmalee and Bogan 1998, p. 168). Inflation of the shell is variable
depending on population and latitudinal location (Ortmann 1920, p. 272;
Williams et al. 2008, p. 474). The shell is thick, solid, and up to 3
in (75 mm) in length, but usually is less than 2.4 in (60 mm)
[[Page 14798]]
(Williams et al. 2008, p. 473; Watters et al. 2009, p. 209). A
distinctive characteristic is that the shell is round in shape, nearly
circular, and the umbo (the raised portion of the dorsal margin of a
shell) is centrally located.
Within the United States, the round hickorynut is currently found
in the Great Lakes, Ohio, Cumberland, Tennessee, and Lower Mississippi
River basins, overlapping within the States of Alabama, Indiana,
Kentucky, Michigan, Mississippi, Ohio, Pennsylvania, Tennessee, and
West Virginia (Service 2019, appendix A; see figure 2, below). It is
considered extirpated from Georgia, Illinois, and New York.
Additionally, it has State-level conservation status, ranging across
various levels of concern, imperilment, or vulnerability (see table 1-1
in the SSA report), in the States of Alabama, Indiana, Kentucky,
Michigan, Pennsylvania, Tennessee, and West Virginia. The round
hickorynut also occurs within the Canadian Province of Ontario, where
it was listed as an endangered species in 2005, due to the loss of and
significant declines in populations (Committee on the Status of Species
at Risk in Ontario 2013, p. 4); a single remaining population (showing
no recruitment (Morris 2018, pers. comm.)) occurs in Lake St. Clair and
the East Sydenham River.
[[Page 14799]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.016
[[Page 14800]]
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Thorough reviews of the taxonomy, life history, ecology and State
listing status of the longsolid and round hickorynut are presented in
detail in the SSA reports (Service 2018, pp. 14, 15, 22-30; Service
2019, pp. 14, 15, 22-29).
Regulatory and Analytical Framework
Regulatory Framework
Section 4 of the Act (16 U.S.C. 1533) and its implementing
regulations in title 50 of the Code of Federal Regulations (CFR) set
forth the procedures for determining whether a species is an endangered
species or a threatened species, issuing protective regulations for
threatened species, and designating critical habitat for endangered and
threatened species. In 2019, jointly with the National Marine Fisheries
Service, the Service issued a final rule that revised the regulations
in 50 CFR part 424 regarding how we add, remove, and reclassify
endangered and threatened species and the criteria for designating
listed species' critical habitat (84 FR 45020; August 27, 2019). On the
same day, the Service also issued final regulations that, for species
listed as threatened species after September 26, 2019, eliminated the
Service's general protective regulations automatically applying to
threatened species the prohibitions that section 9 of the Act applies
to endangered species (84 FR 44753; August 27, 2019). We collectively
refer to these actions as the 2019 regulations.
As with the proposed rule, the regulations that are in effect and
therefore applicable to this final rule are 50 CFR part 424, as amended
by (a) revisions that we issued jointly with the National Marine
Fisheries Service in 2019 regarding both the listing, delisting, and
reclassification of endangered and threatened species and the criteria
for designating listed species' critical habitat (84 FR 45020; August
27, 2019); and (b) revisions that we issued in 2019 eliminating for
species listed as threatened species are September 26, 2019, the
Service's general protective regulations that had automatically applied
to threatened species the prohibitions that section 9 of the Act
applies to endangered species (84 FR 44753; August 27, 2019).
The Act defines an ``endangered species'' as a species that is in
danger of extinction throughout all or a significant portion of its
range, and a ``threatened species'' as a species that is likely to
become an endangered species within the foreseeable future throughout
all or a significant portion of its range. The Act requires that we
determine whether any species is an endangered species or a threatened
species because of any of the following factors:
(A) The present or threatened destruction, modification, or
curtailment of its habitat or range;
(B) Overutilization for commercial, recreational, scientific, or
educational purposes;
(C) Disease or predation;
(D) The inadequacy of existing regulatory mechanisms; or
(E) Other natural or manmade factors affecting its continued
existence.
These factors represent broad categories of natural or human-caused
actions or conditions that could have an effect on a species' continued
existence. In evaluating these actions and conditions, we look for
those that may have a negative effect on individuals of the species, as
well as other actions or conditions that may ameliorate any negative
effects or may have positive effects.
We use the term ``threat'' to refer in general to actions or
conditions that are known to or are reasonably likely to negatively
affect individuals of a species. The term ``threat'' includes actions
or conditions that have a direct impact on individuals (direct
impacts), as well as those that affect individuals through alteration
of their habitat or required resources (stressors). The term ``threat''
may encompass--either together or separately--the source of the action
or condition or the action or condition itself.
However, the mere identification of any threat(s) does not
necessarily mean that the species meets the statutory definition of an
``endangered species'' or a ``threatened species.'' In determining
whether a species meets either definition, we must evaluate all
identified threats by considering the expected response by the species,
and the effects of the threats--in light of those actions and
conditions that will ameliorate the threats--on an individual,
population, and species level. We evaluate each threat and its expected
effects on the species, then analyze the cumulative effect of all of
the threats on the species as a whole. We also consider the cumulative
effect of the threats in light of those actions and conditions that
will have positive effects on the species, such as any existing
regulatory mechanisms or conservation efforts. The Secretary determines
whether the species meets the definition of an ``endangered species''
or a ``threatened species'' only after conducting this cumulative
analysis and describing the expected effect on the species now and in
the foreseeable future.
The Act does not define the term ``foreseeable future,'' which
appears in the statutory definition of ``threatened species.'' Our
implementing regulations at 50 CFR 424.11(d) set forth a framework for
evaluating the foreseeable future on a case-by-case basis. The term
``foreseeable future'' extends only so far into the future as the
Services can reasonably determine that both the future threats and the
species' responses to those threats are likely. In other words, the
foreseeable future is the period of time in which we can make reliable
predictions. ``Reliable'' does not mean ``certain''; it means
sufficient to provide a reasonable degree of confidence in the
prediction. Thus, a prediction is reliable if it is reasonable to
depend on it when making decisions.
It is not always possible or necessary to define the foreseeable
future as a particular number of years. Analysis of the foreseeable
future uses the best scientific and commercial data available and
should consider the timeframes applicable to the relevant threats and
to the species' likely responses to those threats in view of its life-
history characteristics. Data that are typically relevant to assessing
the species' biological response include species-specific factors such
as lifespan, reproductive rates or productivity, certain behaviors, and
other demographic factors.
Analytical Framework
The SSA reports document the results of our comprehensive
biological review of the best scientific and commercial data regarding
the status of both species, including an assessment of potential
threats to the species. The SSA reports do not represent our decision
on whether either species should be listed as an endangered or
threatened species under the Act. However, they do provide the
scientific basis that informs our regulatory decisions, which involve
the further application of standards within the Act and its
implementing regulations and policies.
To assess the longsolid's and round hickorynut's viability, we used
the three conservation biology principles of resiliency, redundancy,
and representation (Shaffer and Stein 2000, pp. 306-310). Briefly,
resiliency is the ability of the species to withstand environmental and
demographic stochasticity (for example, wet or dry, warm or cold
years), redundancy is the ability of the species to withstand
catastrophic events (for example, droughts, large pollution events),
and representation is the ability of the species to adapt to both near-
term and long-term changes in its physical and
[[Page 14801]]
biological environment (for example, climate changes, pathogen). In
general, species viability will increase with increases in resiliency,
redundancy, and representation (Smith et al. 2018, p. 306). Using these
principles, we identified the species' ecological requirements for
survival and reproduction at the individual, population, and species
levels, and described the beneficial and risk factors influencing the
species' viability.
The SSA process can be categorized into three sequential stages.
During the first stage, we evaluated the individual species' life-
history needs. The next stage involved an assessment of the historical
and current condition of the species' demographics and habitat
characteristics, including an explanation of how the species arrived at
its current condition. The final stage of the SSA involved making
predictions about the species' responses to positive and negative
environmental and anthropogenic influences. Throughout all of these
stages, we used the best available information to characterize
viability as the ability of a species to sustain populations in the
wild over time. We use this information to inform our regulatory
decision.
The following is a summary of the key results and conclusions from
the SSA reports for the longsolid and round hickorynut; the full SSA
reports can be found on https://www.regulations.gov at Docket FWS-R4-
ES-2020-0010, and on the Service's ECOS website at https://ecos.fws.gov/ecp/species/9880 and https://ecos.fws.gov/ecp/species/9879.
Summary of Biological Status and Threats
In this discussion, we review the biological condition of the
longsolid and round hickorynut, their resources, and the threats that
influence both species' current and future condition, in order to
assess each species' overall viability and the risks to that viability.
Species Needs
We assessed the best available information to identify the physical
and biological needs to support individual fitness at all life stages
for the longsolid and round hickorynut. Full descriptions of all needs
are available in chapter 4 of the SSA reports (Service 2018, pp. 25-30;
Service 2019, pp. 30-36), which can be found in docket number FWS-R4-
ES-2020-0010 on https://www.regulations.gov. Based upon the best
available scientific and commercial information, and acknowledging
existing ecological uncertainties (see section 4.3 in the SSA reports),
the resource and demographic needs for both the longsolid and round
hickorynut are characterized as:
Clean, flowing water with appropriate water quality and
temperate conditions, such as (but not limited to) dissolved oxygen
above 2 to 3 parts per million (ppm), ammonia generally below 0.5 ppm
total ammonia-nitrogen, temperatures generally below 86 degrees
Fahrenheit ([deg]F) (30 degrees Celsius ([deg]C)), and (ideally) an
absence of excessive total suspended solids and other pollutants.
Natural flow regimes that vary with respect to timing,
magnitude, duration, and frequency of river discharge events.
Predominantly silt-free, stable sand, gravel, and cobble
substrates.
Suspended food and nutrients in the water column including
(but not limited to) phytoplankton, zooplankton, protozoans, detritus,
and dissolved organic matter.
Availability of sufficient host fish numbers to provide
for glochidia infestation and dispersal. Host fishes for the longsolid
are currently unknown but likely include (but may not be limited to):
minnows of the family Cyprinidae as well as potentially freshwater
sculpins of the genus Cottus. Host fish species documented for the
round hickorynut include the banded sculpin (Cottus carolinae), eastern
sand darter (Ammocrypta pellucida), emerald darter (Etheostoma
baileyi), greenside darter (Etheostoma blennioides), Iowa darter
(Etheostoma exile), fantail darter (Etheostoma flabellare), Cumberland
darter (Etheostoma gore), spangled darter (Etheostoma obama), variegate
darter (Etheostoma variatum), blackside darter (Percina maculata), and
frecklebelly darter (Percina stictogaster).
Connectivity among populations. Although the species'
capability to disperse is evident through historical occurrence of a
wide range of rivers and streams, the fragmentation of populations by
small and large impoundments has resulted in isolation and only patches
of what once was occupied contiguous river and stream habitat. Genetic
exchange occurs between and among mussel beds via sperm drift, host
fish movement, and movement of mussels during high flow events. For
genetic exchange to occur, connectivity must be maintained. Most
freshwater mussels, including the longsolid and round hickorynut, are
typically found in mussel beds that vary in size and are often
separated by stream reaches in which mussels are absent or rare (Vaughn
2012, p. 983). These species are often a component of a healthy mussel
assemblage within optimal mussel habitats; therefore, the beds in which
they occur are necessary for the species to be sufficiently resilient
over time.
Current Conditions
Current (and future) conditions are described using categories that
estimate the overall condition of the longsolid and round hickorynut
mussel populations. These categories include:
High--Sufficiently resilient populations with evidence of
recruitment and multiple age classes represented. They are likely to
maintain viability and connectivity among populations, and populations
are not linearly distributed (i.e., occur in tributary streams within a
management unit). Populations are expected to persist in 20 to 30 years
and beyond and withstand stochastic events. (Thriving; capable of
expanding range.)
Medium--Spatially restricted populations with limited
connectivity and reduced levels of recruitment or age class structure.
Resiliency is less than under high conditions, but the majority of
populations (approximately 75 percent) are expected to persist beyond
20 to 30 years. (Stable; not necessarily thriving or expanding its
range.)
Low--Small and highly restricted populations, with no
evidence of recent recruitment or age class structure, and limited
detectability. These populations have low resiliency, are not likely to
withstand stochastic events, and potentially may be extirpated in 20 to
30 years. Populations are linearly distributed within a management
unit. (Surviving and observable, but population likely declining.)
Given the longsolid's and round hickorynut's ranges include lengthy
rivers, such as the Ohio, Allegheny, Cumberland, and Tennessee Rivers,
all of which include populations fragmented primarily by dams, we
identified separate populations for each hydrologic unit code (HUC)
(Seaber et al. 1987, entire; U.S. Geological Survey 2018, entire) at
the fourth of 12 levels (i.e., HUC-8 watershed). The HUC-8 watersheds
are analogous to medium-sized river basins across the United States.
Our analysis describes conditions relevant to longsolid and round
hickorynut populations and the overarching HUC-8 watersheds, identified
herein as a ``management unit.'' A management unit could harbor one or
more populations. See chapter 2 in the SSA reports for further
explanation of the analysis methodology (Service 2018, pp. 15-19;
Service 2019, pp. 17-22).
Longsolid
The longsolid's current range extends over nine States, including
New York,
[[Page 14802]]
Pennsylvania, West Virginia, Ohio, Kentucky, Virginia, Tennessee, North
Carolina, and Alabama; the species is now considered extirpated in
Georgia, Illinois, and Indiana. This range encompasses three major
river basins (the Ohio, Cumberland, and Tennessee basins); the species
now no longer exists in the Great Lakes basin (loss of six historical
populations and four management units). In addition, its representation
in the Cumberland River basin is currently within a single population
and management unit (loss of nine historical populations and eight
management units). Overall, the longsolid is presumed extirpated from
62 percent (100 of 160 populations) of its historically occupied
populations, including 6 populations (the entirety) in the Great Lakes
basin, 62 populations in the Ohio River basin, 8 populations in the
Cumberland River basin, and 24 populations in the Tennessee River basin
(see appendix B in the SSA report (Service 2018, pp. 131-154)). Of the
current populations, 3 (5 percent) are estimated to be highly
resilient, 8 (13 percent) are estimated to be moderately resilient, and
49 (79 percent) are estimated to have low resiliency.
The longsolid was once a common, occasionally abundant component of
the mussel assemblage in rivers and streams where it is now extirpated.
Examples include the Beaver River, Pennsylvania (Ortmann 1920, p. 276);
Ohio River, Pennsylvania (Tolin 1987, p. 11); Mahoning River,
Pennsylvania (Ortmann 1920 p. 276); Wabash River, Indiana/Illinois
(Cummings et al. 1992, p. 46); Nolin River, Kentucky (Taylor 1983a, p.
111); and the South Fork Holston River, Virginia/Tennessee (Parmalee
and Pohemus 2004, p. 234). Significant declines of the longsolid have
been observed and documented in the Ohio and Cumberland Rivers (Neel
and Allen 1964, p. 434, Haag and Cicerello 2016, p. 139) and in the
Muskingum River system, which harbors the last remaining populations
(Muskingum, Tuscarawas, and Walhonding) in Ohio (Watters and Dunn 1993-
94, p. 252; Watters et al. 2009, p. 131).
Round Hickorynut
The current range of the round hickorynut extends over nine States,
including Alabama, Indiana, Kentucky, Michigan, Mississippi, Ohio,
Pennsylvania, Tennessee, and West Virginia; the species is now
considered extirpated in Georgia, Illinois, and New York. This range
encompasses five major river basins (Great Lakes, Ohio River,
Cumberland River, Tennessee River, and Lower Mississippi River). Round
hickorynut representation in the Cumberland River basin is restricted
to two linear populations within two management units, while it exists
in the Lower Mississippi River basin in a single population. Therefore,
while the species currently maintains representation from historical
conditions, it is at immediate risk of losing 40 percent (2 of 5
basins) of its representation due to these small, isolated populations
under a high degree of threats from habitat loss and water quality
degradation.
Overall, the round hickorynut has lost approximately 232 of 301
known populations (77 percent), and 102 of 138 management units (74
percent). This includes 25 populations in the Great Lakes basin, 146
populations in the Ohio River basin, 23 populations in the Cumberland
River basin, 29 populations in the Tennessee River basin, and 9
populations in the Lower Mississippi River basin (see appendix B in the
SSA report (Service 2019, pp. 191-212)). Of the current populations, 4
(6 percent) are estimated to be highly resilient, 16 (23 percent) are
estimated to be moderately resilient, and 49 (71 percent) are estimated
to have low resiliency.
The round hickorynut was once a much more common, occasionally
abundant component of the mussel assemblage in rivers and streams
across much of the eastern United States. Population extirpations have
been extensive and widespread within every major river basin where the
round hickorynut is found. Surveys throughout eastern North America
have not targeted the round hickorynut specifically, and as a result,
there could have been additional population losses or declines that
have gone undocumented. Conversely, it is possible that there are
populations that have gone undetected. However, the majority of the
species' range has been relatively well-surveyed for freshwater mussel
communities, and the likelihood is low that substantial or stronghold
populations remain undetected. Patterns of population extirpation and
declines are pronounced, particularly in the Ohio River basin, which
appears to be the basin most important for redundancy and
representation for the species due to its documented historical
distribution and remaining concentration of populations within the
basin.
Populations of the round hickorynut have been lost from entire
watersheds and management units in which the species once occupied
multiple tributaries, such as the Allegheny, Coal, Little Scioto,
Miami, and Vermilion River management units in the Ohio River basin.
The State of Ohio, for example, has lost 49 populations of round
hickorynut, along with 17 management units (Watters et al. 2009, p.
210). The species is also critically imperiled in Canada, and as a
result, the future of the species in Canada may be reliant on hatchery-
supported activities or augmentation activities coordinated with the
United States.
Precipitous declines and extirpations of round hickorynut
populations have been documented in the Great Lakes, Ohio, Cumberland,
Tennessee, and Lower Mississippi basins. Chronological museum
collections and published literature accounts of the species
demonstrate that individuals were more abundant in populations and
there were more populations across the range (see appendix D in the SSA
report (Service 2019, pp. 214-238)). While this documentation could be
a result of more intensive survey effort in the core of the species'
distribution, regardless, the extirpation of formerly abundant and
extensive populations, has been most pronounced in the Ohio and
Cumberland basins.
Examples of rivers where the round hickorynut is extirpated within
these basins include: Crooked Creek, Pennsylvania (Ortmann 1913, p.
298); West Branch Mahoning River, Ohio (Swart 1940, p. 42); Coal River,
West Virginia (Carnegie Museum and University of Michigan Museum of
Zoology records); Olentangy River, Ohio (Stein 1963, p. 109); Blaine
Creek, Kentucky (Bay and Winford 1984, p. 19); Embarras River, Illinois
(Parmalee 1967, p. 80); Big Vermilion River, Illinois (Parmalee 1967,
p. 80); Cumberland River, Kentucky (Neel and Allen 1964, p. 442);
Stones River, Tennessee (Ohio State University Museum records); and Red
River, Tennessee/Kentucky (Ohio State University Museum records).
Threats Analysis
The following discussions include evaluations of three threats and
associated sources that are affecting the longsolid and round
hickorynut and their habitats: (1) Habitat degradation or loss, (2)
invasive and nonnative species, and (3) negative effects associated
with small population size, including potential cumulative or
synergistic effects (Service 2018 and 2019, chapter 6). We note that
potential impacts associated with overutilization were evaluated, but
we found no evidence of current effects on the species' viability
(noting historical effects from harvest on the longsolid that no longer
occur). In addition, potential impacts from disease, parasites, and
predation, as well as potential impacts to host
[[Page 14803]]
species, were evaluated but were found to have minimal effects on
viability of either species based on current knowledge (Service 2018,
pp. 70, 73-74; Service 2019, pp. 91-95). Finally, we also considered
effects associated with enigmatic population declines, which have been
documented in freshwater river mussel populations since the 1960s;
despite speculation and repeated aquatic organism surveys and water
quality monitoring, the causes of these events are unknown (Haag 2019,
p. 43). In some cases, the instream habitat often remains basically
intact and continues to support other aquatic organisms such as fish
and crayfish. Full descriptions of each of the threats and their
sources, including specific examples across the species' range where
threats are impacting the species or its habitat, are available in
chapter 6 and appendix A of the SSA reports (Service 2018, pp. 43-76,
134-157; Service 2019, pp. 58-96, 169-187).
We note that, by using the SSA framework to guide our analysis of
the scientific information documented in both the longsolid and round
hickorynut SSA reports, we have not only analyzed individual effects on
the two species, but we have also analyzed their potential cumulative
effects. We incorporate the cumulative effects into our SSA analysis
when we characterize the current and future condition of the species.
To assess the current and future condition of each of the species, we
undertake an iterative analysis that encompasses and incorporates the
threats individually and then accumulates and evaluates the effects of
all the relevant factors that may be influencing the species, including
threats and conservation efforts. Because the SSA framework considers
not just the presence of the factors, but to what degree they
collectively influence risk to the entire species, our assessment
integrates the cumulative effects of the factors and replaces a
standalone cumulative effects analysis.
Habitat Degradation or Loss
Development/Urbanization
Development and urbanization activities that may contribute to
longsolid and round hickorynut habitat degradation and loss, including
reduced water quality, occur throughout the species' range. The term
``development'' refers to urbanization of the landscape, including (but
not limited to) land conversion for residential, commercial, and
industrial uses and the accompanying infrastructure. The effects of
urbanization may include alterations to water quality, water quantity,
and habitat (both in-stream and streamside) (Ren et al. 2003, p. 649;
Wilson 2015, p. 424). Urban development can lead to increased
variability in streamflow, typically increasing the extent and volume
of water entering a stream after a storm and decreasing the time it
takes for the water to travel over the land before entering the stream
(Giddings et al. 2009, p. 1). Deleterious effects on streams (i.e.,
water collection on impervious surfaces that rapidly flows into storm
drains and local streams), including those that may be occupied by the
longsolid and round hickorynut include:
(1) Water Quantity: Storm drains deliver large volumes of water to
streams much faster than would naturally occur, often resulting in
flooding and bank erosion that reshapes the channel and causes
substrate instability, resulting in destabilization of bottom
sediments. Increased, high-velocity discharges can cause species living
in streams (including mussels) to become stressed, displaced, or killed
by fast-moving water and the debris and sediment carried in it.
Displaced individuals may be left stranded out of the water once
floodwaters recede.
(2) Water Quality: Pollutants (e.g., gasoline, oil drips,
fertilizers) that accumulate on impervious surfaces may be washed
directly into streams during storm events. Contaminants contained in
point and non-point source discharges degrade water and substrate
quality, and can result in reduced survival, growth, and reproduction
of mussels.
(3) Water Temperature: During warm weather, rain that falls on
impervious surfaces becomes superheated and can stress or kill
freshwater species when it enters streams.
Other development-related impacts to the longsolid and round
hickorynut, or their habitats, may occur as a result of:
Water infrastructure. This includes water supply,
reclamation, and wastewater treatment, which results in pollution point
discharges to streams. Concentrations of contaminants (including
nitrogen, phosphorus, chloride, insecticides, polycyclic aromatic
hydrocarbons, and personal care products) increase with urban
development (Giddings et al. 2009, p. 2; Bringolf et al. 2010, p.
1,311).
Utility crossings and right-of-way maintenance. Direct
impacts from utility crossings include direct exposure or crushing of
individuals, sedimentation, and habitat disturbance. The greatest
cumulative impact involves cleared rights-of-way that result in direct
runoff and increased stream temperature at the crossing location, and
potentially promote maintenance utility and all-terrain vehicle access
from the rights-of-way (which destroys banks and instream habitat, and
thus can lead to increased erosion (see also Service 2017, pp. 48-49)).
Anthropogenic activities. These types of activities may
act to lower water tables, making the longsolid or round hickorynut
susceptible to depressed flow levels. Water infrastructure (see above)
and water withdrawals for irrigation, municipal, and industrial water
supplies are an increasing concern due to expanding human populations.
It is currently unknown whether anthropogenic effects of development
and urbanization are likely to impact the longsolid or round hickorynut
at the individual or population level. However, secondary impacts such
as the increased likelihood of potential contaminant introduction,
stream disturbance caused by impervious surfaces, barrier construction,
and forest conversion are likely to act cumulatively on longsolid and
round hickorynut populations.
Agricultural activities are pervasive across the range of the
longsolid and round hickorynut. Examples include (but are not limited
to):
Longsolid: Agricultural erosion is listed among the
factors affecting the Clinch and Powell Rivers (Ahlstedt et al. 2016,
p. 8).
Longsolid: Sedimentation and other non-point source
pollution, primarily of agricultural origin, are identified as a
primary threat to aquatic fauna of the Nolichucky River (Tennessee
Valley Authority (TVA) 2006, p. 11).
Longsolid: Agricultural impacts have been noted to take a
toll on mussel fauna in the Goose Creek watershed of the South Fork
Kentucky River (Evans 2010, p. 15).
Longsolid and round hickorynut: The Elk River in Tennessee
is a watershed with significant agricultural activity (Woodside et al.
2004, p. 10).
Round hickorynut: Water withdrawals for irrigation for
agricultural uses have increased recently in the Tippecanoe River
(Fisher 2019, pers. comm.).
Round hickorynut: Sedimentation and other point and non-
point source pollution, primarily of agricultural origin, are
identified as a primary threat to aquatic fauna of Big Darby Creek and
Killbuck Creek, Ohio (Ohio Department of the Environmental Protection
Agency 2004, p. 1; Ohio Department of the Environmental Protection
Agency 2011, p. 31).
Round hickorynut: Approximately 25 percent of the land use
area in the
[[Page 14804]]
West Fork River management unit in West Virginia is in agriculture,
increasing by as much as 9 percent as most recently reported in 2010
(U.S. Department of Agriculture 2010, p. 8).
Round hickorynut: Large-scale mechanized agricultural
practices threaten the last remaining population in the Lower
Mississippi River basin, in the Big Black River, where the species has
already undergone range reduction (Peacock and James 2002, p. 123).
Round hickorynut: The Duck, Buffalo, and Elk Rivers in
Tennessee are watersheds with significant agricultural activity in
their headwaters and tributaries and are a suspected cause for mussel
community declines throughout those rivers (Reed 2014, p. 4).
Transportation
Transportation-related impacts include both road development and
river navigation. By its nature, road development increases impervious
surfaces as well as land clearing and habitat fragmentation. Roads are
generally associated with negative effects on the biotic integrity of
aquatic ecosystems, including changes in surface water temperatures and
patterns of runoff, changes in sedimentation levels, and increased
heavy metals (especially lead), salts, organics, and nutrients to
stream systems (Trombulak and Frissell 2000, p. 18). The adding of
salts through road de-icing results in high salinity runoff, which is
toxic to freshwater mussels. In addition, a major impact of road
development is improperly constructed culverts at stream crossings,
which can act as barriers if flow through the culvert varies
significantly from the rest of the stream, or if the culvert ends up
becoming perched (i.e., sitting above the downstream streambed), and
fishes that serve as mussel hosts cannot pass through them.
With regard to river navigation, dredging and channelization
activities (as a means of maintaining waterways) have altered riverine
habitats nationwide (Ebert 1993, p. 157). Channelization affects many
physical characteristics of streams through accelerated erosion,
increased bed load, reduced depth, decreased habitat diversity,
geomorphic instability, and riparian canopy loss (Hartfield 1993, p.
139). All of these impacts contribute to loss of habitat for the
longsolid and round hickorynut and alter habitats for host fish.
Changes in both the water velocity and deposition of sediments not only
alters physical habitat, but the associated increases in turbulence,
suspended sediment, and turbidity affect mussel feeding and respiration
(Aldridge et al. 1987, p. 25). The scope of channel maintenance
activities over extensive areas alters physical habitat and degrades
water quality. In addition to dredging and channel maintenance, impacts
associated with barge traffic, which includes construction of fleeting
areas, mooring cells, docking facilities, and propeller wash, also
destroy and disrupt mussel habitat (see Miller et al. (1989, pp. 48-49)
as an example for disturbance from barges).
Transportation-related impacts across the range of the longsolid
and round hickorynut include (but are not limited to) the following
examples:
Channelization and dredging--Longsolid populations in the
Eel, Vermilion, and Embarras Rivers and Killbuck Creek are extirpated.
Round hickorynut populations in the Vermilion and Embarras Rivers are
extirpated, while populations in the Eel and Killbuck Creek management
units are in low condition; these streams have been extensively dredged
and channelized (Butler 2007, p. 63; Appendix B). Additionally,
dredging for barge traffic and navigation is identified as the primary
cause for suitable habitat loss in the Kanawha River (below river mile
79) in West Virginia (Taylor 1983b, p. 3).
Barge traffic, which includes construction of fleeting
areas, mooring cells, docking facilities, and propeller wash, destroys
and disrupts mussel habitat, currently affecting at least 15 (25
percent) of the longsolid populations in the Ohio, Cumberland, and
Tennessee River basins (Hubbs et al. 2006, p. 169; Hubbs 2012, p. 3;
Smith and Meyer 2010, p. 555; Sickel and Burnett 2005, p. 7; Taylor
1983b, p. 5). All six of the Ohio River mainstem longsolid populations
that are considered in low condition are affected by channel
maintenance and navigation operations; at least five (8 percent) of the
round hickorynut populations in the Ohio basin are affected.
Channel maintenance and navigation are affecting the low
condition populations in the lower Allegheny, Kanawha, and Tennessee
Rivers due to their clustered distribution and proximity to locks and
dams. For the longsolid, these include two Allegheny River populations
below Redbank, Pennsylvania (Smith and Meyer 2010, p. 556); one
population in the Kanawha River, West Virginia; and three low condition
populations in the Tennessee River main stem above Kentucky Dam.
Although most prevalent on the mainstem Ohio and Tennessee
Rivers, commerce and commercial navigation currently affect round
hickorynut populations in the Black and Muskingum Rivers.
Contaminants
Contaminants contained in point and non-point discharges can
degrade water and substrate quality and adversely impact mussel
populations. Although chemical spills and other point sources of
contaminants may directly result in mussel mortality, widespread
decreases in density and diversity may result in part from the subtle,
pervasive effects of chronic, low-level contamination (Naimo 1995, p.
354). The effects of heavy metals, ammonia, and other contaminants on
freshwater mussels were reviewed by Mellinger (1972), Fuller (1974),
Havlik and Marking (1987), Naimo (1995), Keller and Lydy (1997), and
Newton et al. (2003).
The effects of contaminants such as metals, chlorine, and ammonia
are profound on juvenile mussels (Augspurger et al. 2003, p. 2,571;
Bartsch et al. 2003, p. 2,566). Juvenile mussels may readily ingest
contaminants adsorbed to sediment particles while pedal feeding (Newton
and Cope 2007, p. 276). These contaminants also affect mussel
glochidia, which are sensitive to some toxicants (Goudreau et al. 1993,
p. 221; Jacobson et al. 1997, p. 2,386; Valenti et al. 2005, p. 1,243).
Mussels are noticeably intolerant of heavy metals (Havlik and
Marking 1987, p. 4). Even at low levels, certain heavy metals may
inhibit glochidial attachment to fish hosts. Cadmium appears to be the
heavy metal most toxic to mussels (Havlik and Marking 1987, pp. 4-9),
although chromium, copper, mercury, and zinc also negatively affect
biological processes (Naimo 1995, p. 355; Jacobson et al. 1997, p.
2,389; Valenti et al. 2005, p. 1,243). Chronic mercury contamination
from a chemical plant on the North Fork Holston River, Virginia,
destroyed a diverse mussel fauna downstream of Saltville, Virginia, and
potentially contributed to the extirpation of the longsolid from that
river (Brown et al. 2005, p. 1,459). An example of long-term declines
and extirpation of mussels attributed to copper and zinc contamination
originating from wastewater discharges at electric power plants
includes the Clinch River in Virginia (a portion of which the longsolid
currently occupies) (Zipper et al. 2014, p. 9). This highlights that,
despite localized improvements, these metals can stay bound in
sediments, affecting recruitment and densities of the mussel fauna for
decades (Price et al. 2014, p. 12; Zipper et al. 2014, p. 9).
[[Page 14805]]
Examples of contaminant-related impacts across the range of
longsolid and/or round hickorynut include (but are not limited to):
Contaminants have affected mussel glochidia on the Clinch
River, which is a stronghold population for the longsolid (Goudreau et
al. 1993, p. 221; Jacobson et al. 1997, p. 2,386; Valenti et al. 2005,
p. 1,243); round hickorynut is now considered extirpated in the
Tennessee section of the river.
The toxic effects of high salinity wastewater from oil and
natural gas drilling on juvenile and adult freshwater mussels were
observed in the Allegheny River, Pennsylvania, and in the Ohio River
basin (Patnode et al. 2015, p. 55).
Numerous streams throughout both species' ranges have
experienced mussel and fish kills from toxic chemical spills, such as
Fish Creek in Indiana for the round hickorynut (Sparks et al. 1999, p.
12), and the upper Tennessee River system in Virginia for the longsolid
(Ahlstedt et al. 2016, p. 8; Neves 1987, p. 9; Jones et al. 2001, p.
20; Schmerfeld 2006, p. 12). Also in the Tennessee River basin, high
counts of coliform bacteria originating from wastewater treatment
plants have been documented, contributing to degradation of water
quality being a primary threat to aquatic fauna (Neves and Angermeier
1990, p. 50).
Heavy metals and their toxicity to mussels have been
documented in the Great Lakes and in the Clinton, Muskingum, Ohio, Fox,
Powell, Clinch, and Tennessee Rivers where one or both of these species
occur (Havlik and Marking 1987, pp. 4-9; van Hees et al. 2010, p. 606).
Coal plants are also located on the Kanawha, Green, and Cumberland
Rivers, and the effects of these facilities on water quality and the
freshwater mussel fauna, including the longsolid and round hickorynut,
are likely similar.
The degradation of water quality as a result of land-based oil and
gas drilling activities has a significant adverse effect on freshwater
mussels, and specifically on the longsolid in the Ohio River basin and
populations in the Allegheny River, as well as the Kanawha, Little
Kanawha, and Elk Rivers (Entrekin et al. 2015, p. 2; Ecological
Specialists, Inc. 2009, p. 27; Pond et al. 2008, p. 723; Patnode et al.
2015, p. 55).
Agricultural Activities
The advent of intensive row crop agricultural practices has been
cited as a potential factor in freshwater mussel decline and species
extirpation in the eastern United States (Peacock et al. 2005, p. 550).
Nutrient enrichment and water withdrawals, which are threats commonly
associated with agricultural activities, are most likely to affect
individual longsolid and round hickorynut mussels, although in some
instances may be localized and limited in scope. However, chemical
control using pesticides, including herbicides, fungicides,
insecticides, and their surfactants and adjuvants, are highly toxic to
juvenile and adult freshwater mussels (Bringolf et al. 2007, p. 2,092).
Waste from confined animal feeding and commercial livestock operations
is another potential source of contaminants that comes from
agricultural runoff. The concentrations of these contaminants that
emanate from fields or pastures may be at levels that can affect an
entire population, especially given the highly fragmented distributions
of the longsolid and round hickorynut (also see Contaminants, above).
Agencies such as the U.S. Department of Agriculture's Natural
Resources Conservation Service and Soil and Water Conservation
Districts provide technical and financial assistance to farmers and
private landowners. Additionally, county resource development councils
and university agricultural extension services disseminate information
on the importance of minimizing land use impacts, specifically
agriculture, on aquatic resources. These programs help identify
opportunities for conservation through projects such as exclusion
fencing and alternate water supply sources, which help decrease
nutrient inputs and water withdrawals, and help keep livestock off of
stream banks and shorelines, thus reducing erosion. However, the
overall effectiveness of these programs over a large scale is unknown
given the longsolid's and round hickorynut's wide distribution and
varying agricultural intensities.
Given the large extent of private land and agricultural activities
within the ranges of the longsolid and round hickorynut, the effects of
agricultural activities that degrade water quality and result in
habitat deterioration (also see Development/Urbanization, above) are
not frequently detected until after the event(s) occur. In summary,
agricultural activities are pervasive across the ranges of the
longsolid and round hickorynut. The effects of agricultural activities
on the longsolid and round hickorynut are a factor in their historical
decline and localized extirpations.
Agricultural activities are pervasive across the range of the
longsolid and round hickorynut. Specifically, agricultural impacts have
affected and continue to affect high, medium, and low condition
longsolid populations within these basins, including:
Longsolid only: French Creek and Allegheny River
(Pennsylvania), Hughes River (West Virginia), Tuscawaras River (Ohio),
Rolling Fork River (Kentucky), Little River and Valley River (North
Carolina), Nolichucky River (Tennessee), Clinch and Powell Rivers
(Tennessee and Virginia), and Estill Fork (Alabama).
Round hickorynut only: South Fork Hughes River (West
Virginia), and Pine, Belle, and Black Rivers (Michigan).
Both species: Shenango River (Pennsylvania); Middle Island
Creek, Elk, Little Kanawha, and North Fork Hughes Rivers (West
Virginia); Licking and Kentucky Rivers (Kentucky); Elk and Buffalo
Rivers (Tennessee); and Paint Rock River (Alabama).
Dams and Barriers
The effects of impoundments and barriers on aquatic habitats and
freshwater mussels are relatively well-documented (Watters 2000, p.
261). Dams alter and disrupt connectivity, and alter water quality,
which affect longsolid and round hickorynut species. Extinction/
extirpation of North American freshwater mussels can be traced to
impoundment and inundation of riffle habitats in all major river basins
of the central and eastern United States (Haag 2009, p. 107). Humans
have constructed dams for a variety of reasons: flood prevention, water
storage, electricity generation, irrigation, recreation, and navigation
(Eissa and Zaki 2011, p. 253). Dams, either natural (by beavers or by
aggregations of woody debris) or manmade, have many impacts on stream
ecosystems. Reductions in the diversity and abundance of mussels are
primarily attributed to habitat shifts caused by impoundments (Neves et
al. 1997, p. 63). The survival of mussels and their overall
reproductive success are influenced:
Upstream of dams, by the change from flowing to impounded
waters, increased depths, increased buildup of sediments, decreased
dissolved oxygen, and the drastic alteration in resident fish
populations.
Downstream of dams, by fluctuations in flow regimes,
minimal releases and scouring flows, seasonal depletion of dissolved
oxygen, reduced or increased water temperatures, and changes in fish
assemblages.
Additionally, improperly constructed culverts at stream crossings
may act as barriers and have some similar negative effects as dams on
stream systems. Fluctuating flows through the culvert can vary
significantly from the rest of the stream, preventing fish passage and
[[Page 14806]]
scouring downstream habitats. For example, if a culvert sits above the
streambed, aquatic organisms cannot pass through it. These barriers
fragment habitats along a stream course and contribute to genetic
isolation of the aquatic species inhabiting the streams.
Whether constructed for purposes such as flood control, navigation,
hydropower, water supply or multi-purpose uses, the construction and
continued operation of dams (per existing licensing schedules) is a
pervasive negative influence on the longsolid, round hickorynut, and
their habitats throughout their ranges. Although there are recent
efforts to remove older, failing dams within the ranges of the
longsolid and round hickorynut, such as Lock and Dam 6 on the Green
River, and Six Mile Dam on the Walhonding River, dams and their effects
on longsolid and round hickorynut population distributions have had
perhaps the greatest documented negative influence on these species
(Hardison and Layzer 2001, p. 79; Layzer et al. 1993, p. 68; Parmalee
and Polhemus 2004, p. 239; Smith and Meyer 2010, p. 543; Hubbs 2012, p.
8; Watters and Flaute 2010, p. 2).
Over 20 of the rivers and streams currently occupied by the
longsolid are directly affected by dams, thus directly influencing the
species' distribution rangewide. For the round hickorynut, all occupied
rivers and streams are directly or indirectly affected by dams. See
section 6.1.5 of the SSA reports for specific areas where dams and
other impoundments occur within the range of the species (Service 2018,
pp. 59-63; Service 2019, pp. 73-77).
Changing Climate Conditions
Changing climate conditions that can influence freshwater mussels
include increasing or decreasing water temperatures and precipitation
patterns that result in increased flooding, prolonged droughts, or
reduced stream flows, as well as changes in salinity levels (Nobles and
Zhang 2011, pp. 147-148). An increase in the number of days with heavy
precipitation over the next 25 to 35 years is expected across the
longsolid's range (U.S. Global Climate Change Research Program 2017, p.
207). Although changing climate conditions have potentially affected
the longsolid, the timing, frequency, and extent of these effects is
currently unknown. Possible impacts to the species could include
alteration of the fundamental ecological processes, such as thermal
suitability; changes in seasonal patterns of precipitation and runoff,
which could alter the hydrology of streams; and changes in the presence
or combinations of invasive, native or nonnative species.
We examined information on anticipated climate effects to wide-
ranging mussels, which included a study that used representative
concentration pathways (RCPs) 2.6 and 8.5 and was conducted on the
federally endangered spectaclecase (Cumberlandia monodonta). Our
analysis of the best available climate change information revealed that
within the range of both the longsolid and round hickorynut, shifts in
the species-specific physiological thresholds in response to altered
precipitation patterns and resulting thermal regimes are possible.
Additionally, the expansion of invasive, nonnative species because of
climatic changes has the potential for long-term detriments to the
mussels and their habitats. Other potential impacts are associated with
changes in food web dynamics and the genetic bottleneck that can occur
with low effective population sizes (Nobles and Zhang 2011, p. 148).
The influences of these changes on the longsolid and round hickorynut
are possible in the future (see Scenario 3 discussions under Future
Conditions, below). Multi-scale climate models that can be interpreted
at both the rangewide and population levels, and are tailored to
benthic invertebrates, which incorporate genetic and life-history
information, are needed before the longsolid and round hickorynut
declines can be correlated with climate change. At this time, the best
available information indicates that climate change is considered a
secondary factor influencing the viability of the longsolid and round
hickorynut and is not currently thought to be a primary factor in the
longsolid's or round hickorynut's occurrence and distribution across
their ranges.
Resource Extraction
The most intensive resource extraction activities affecting the
longsolid, round hickorynut, and their habitats are coal mining and oil
and gas exploration, which are summarized here. Additional less
intensive resource extraction activities affecting the species include
gravel mining/dredging, which is detailed in the SSA reports (Service
2018, pp. 64-65; Service 2019, pp. 79-83).
Activities associated with coal mining and oil and gas drilling can
contribute chemical pollutants to streams. Acid mine and saline
drainage (AMD) is created from the oxidation of iron-sulfide minerals
such as pyrite, forming sulfuric acid (Sams and Beer 2000, p. 3). This
AMD may be associated with high concentrations of aluminum, manganese,
zinc, and other constituents (Tennessee Department of Environment and
Conservation (TDEC) 2014, p. 72). These metals, and the high acidity
typically associated with AMD, can be acutely and chronically toxic to
aquatic life (Jones 1964, p. 96).
Natural gas extraction has negatively affected water quality
through accidental spills and discharges, as well as increased
sedimentation due to increases in impervious surface and tree removal
for drill pads and pipelines (Vidic et al. 2013, p. 6). Disposal of
insufficiently treated brine wastewater is known to adversely affect
freshwater mussels (Patnode et al. 2015, p. 62). Contaminant spills are
also a concern.
Unconsolidated sediment appears to be the largest impact to mussel
physical habitat in streams as a result of gas extraction activities
(Entrekin et al. 2015, p. 23). Excessive suspended sediments can impair
feeding processes, leading to acute short-term or chronic long-term
stress. Both excessive sedimentation and excessive suspended sediments
can lead to reduced mussel fitness (Ellis 1936, p. 29; Anderson and
Kreeger 2010, p. 2). This sediment is generated by construction of the
well pads, access roads, and pipelines (for both gas and water).
Examples of the variety of resource extraction activities (coal,
oil, gas, and gravel mining) that occur across the range of the
longsolid and round hickorynut include (but are not limited to):
Longsolid: The Cumberland Plateau and Central Appalachian
regions of Tennessee and Kentucky (upper Cumberland River system and
upper Tennessee River system) continue to experience mining activity
that impairs water quality in streams (TDEC 2014, p. 62).
Longsolid: High levels of copper, manganese, and zinc,
metals toxic to freshwater mussels, were found in sediment samples from
both the Clinch and Powell Rivers, and mining impacts close to Big
Stone Gap, Virginia, have almost eliminated the mussel fauna in the
upper Powell River. The longsolid is considered extirpated from the
South Fork Powell River and Cane Creek, both tributaries to the upper
portion of the Powell River (Ahlstedt and Tuberville 1997, p. 75;
appendix D in the SSA report).
Round hickorynut: Although populations persist in the
Rockcastle River and Buck Creek in the Cumberland basin, coal and
gravel mining continue to occur in these watersheds.
Round hickorynut: The extensive mining of gravel in
riparian zones
[[Page 14807]]
reduces vegetative buffers and causes channel instability and has been
implicated in mussel declines in the Walhonding River, Ohio, which
harbors a low condition population (Hoggarth 1995-96, p. 150).
Round hickorynut: The West Fork River in West Virginia has
oil and gas activity within the watershed, as well as legacy mining
issues, which have resulted in biological impairment throughout the
drainage (West Virginia Department of Environmental Protection 2014,
pp. 23-29).
Both species: Impacts from natural gas pipelines have a
high potential to occur in West Virginia and Pennsylvania. Tank trucks
hauling such fluids can overturn into mussel streams, which has
occurred in Meathouse Fork of Middle Island Creek (Clayton 2018, pers.
comm.).
Both species: Natural gas extraction in the Marcellus
Shale region (the largest natural gas field in the United States that
runs through northern Appalachia) has negatively affected water quality
through accidental spills and discharges in populations in the
Shenango, Elk, Little Kanawha, and Kanawha management units.
Both species: Coal mining has been implicated in sediment
and water chemistry impacts in the Kanawha River in West Virginia,
potentially limiting the Kanawha River populations of both species
(Morris and Taylor 1978, p. 153).
Both species: Resource extraction and AMD have been cited
as contributors to the loss of mussel species in the Cumberland basin
(Haag and Cicerello 2016, p. 15), including the loss of longsolid from
Rockcastle and Caney Fork Rivers, and the loss of round hickorynut in
the Caney Fork, Little South Fork, Big South Fork, and Cumberland
Rivers (Anderson et al. 1991, p. 6; Layzer and Anderson 1992, p. 97;
Warren and Haag 2005, p. 1,383).
Both species: In the upper Kentucky River watershed, where
both species exhibit a lack of recruitment (and also in the Red River
for round hickorynut), historical un-reclaimed mines and active coal
mines are prevalent (Kentucky Department for Environmental Protection
2015, p. 66).
Forest Conversion
Clearing large areas of forested wetlands and riparian systems
eliminates shade once provided by tree canopies, exposing streams to
more sunlight and increasing the in-stream water temperature (Wenger
1999, p. 35). The increase in stream temperature and light after
deforestation alters macroinvertebrate (and other aquatic species)
richness, abundance, and composition in streams to various degrees
depending on a species' tolerance to temperature changes and increased
light in the aquatic system (Kishi et al. 2004, p. 283; Couceiro et al.
2007, p. 272; Caldwell et al. 2014, p. 2,196).
Sediment runoff from clearing forested areas is a known stressor to
aquatic systems (e.g., Webster et al. 1992, p. 232; Jones III et al.
1999, p. 1,455; Broadmeadow and Nisbet 2004, p. 286; Aust et al. 2011,
p. 123). The physical characteristics of stream channels are affected
when large quantities of sediment are added or removed (Watters 2000,
p. 263). Mussels and fishes are potentially affected by changes in
suspended and bed material load, changes in bed sediment composition
associated with increased sediment production and runoff, changes in
channel formation, stream crossings, and inadequately buffered clear-
cut areas, all of which can be sources of sediment entering streams
(Taylor et al. 1999, p. 13).
Forest conversion to other land uses such as agriculture and urban
development has occurred across the range of the longsolid and round
hickorynut. Siltation and erosion from forest conversion to other land
use activities without BMPs is a well-documented stressor to aquatic
systems throughout the eastern United States, and can have an impact
depending on the physical, chemical, and biological characteristics of
adjacent streams (Allan and Castillo 2007, p. 107). Forest conversion
has been documented in all basins in which these species occur.
Also, some forestry practices have the potential to result in
increased siltation in riparian systems through the cycle of forest
thinning, final harvest, site preparation, and re-planting activities.
However, implementation of BMPs and establishment of SMZs can minimize
these impacts (Service 2018 and 2019, chapter 6); adherence to these
BMPs and SMZs broadly protects water quality, particularly related to
sedimentation (as reviewed by Cristan et al. 2016, entire; Warrington
et al. 2017, entire; and Schilling et al. 2021, entire).
Invasive and Nonnative Species
When a nonnative species is introduced into an ecosystem, it may
have many advantages over native species, such as easy adaptation to
varying environments and a high tolerance of living conditions that
allow it to thrive in its new habitat. There may not be natural
predators to keep the nonnative species in check; therefore, it can
potentially live longer and reproduce more often, further reducing the
biodiversity in the system. The native species may become an easy food
source for invasive, nonnative species, or the invasive species may
carry diseases that extirpate populations of native species. Invasive,
nonnative species are pervasive across the longsolid's and round
hickorynut's ranges. Examples of invasive, nonnative species that
affect freshwater mussels like the longsolid and round hickorynut are
the Asian clam (Corbicula fluminea), zebra mussel (Dreissena
polymorpha), quagga mussel (Dreissena bugensis), black carp
(Mylopharyngodon piceus), didymo (also known as rock snot;
Didymosphenia geminata), and hydrilla (also known as water-thyme;
Hydrilla verticillata).
The Asian clam alters benthic substrates, may filter
mussel sperm or glochidia, competes with native species for limited
resources, and causes ammonia spikes in surrounding water when they die
off en masse (Scheller 1997, p. 2).
Dreissenid mollusks, such as the zebra mussel and quagga
mussel, adversely affect native species through direct colonization,
reduction of available habitat, changes in the biotic environment, or a
reduction in food sources (MacIsaac 1996, p. 292). Zebra mussels are
also known to alter the nutrient cycle in aquatic habitats, affecting
other mollusks and fish species (Strayer 1999, p. 22).
Given their size and diet preferences, black carp have the
potential to restructure benthic communities. Mussel beds consisting of
smaller individuals and juvenile recruits are probably most vulnerable
to being consumed by black carp (Nico et al. 2005, p. 192).
Furthermore, because black carp attain a large size (well over 3.28-ft
(1-m) long), and their life span is reportedly over 15 years, they are
expected to persist for many years. Therefore, they have the potential
to cause harm to native mollusks by way of predation on multiple age
classes (Nico et al. 2005, p. 77).
The two nonnative plant species that are most problematic
for the longsolid and round hickorynut (i.e., impacting the species
throughout their ranges) are hydrilla and didymo. Hydrilla is an
aquatic plant that alters stream habitat, decreases flows, and
contributes to sediment buildup in streams (National Invasive Species
Council Management Plan 2018, p. 2). High sedimentation can cause
suffocation, reduce stream flow, and make it difficult for mussels'
interactions with host fish necessary for development. Didymo can alter
the
[[Page 14808]]
habitat and change the flow dynamics of a site (Jackson et al. 2016, p.
970). Invasive plants grow uncontrolled and can smother habitat, affect
flow dynamics, alter water chemistry, and increase water temperatures,
especially in drought conditions (Colle et al. 1987, p. 416).
Specifically for the round hickorynut, the nonnative round
goby can out-compete native benthic fishes (such as darters and
sculpin) for food and other resources, and may also prey especially
heavily on juvenile native mussels, such as round hickorynut (Bradshaw-
Wilson et al. 2019, p. 268)
Effects Associated With Small Population Size
Without the level of population connectedness that the species
experienced historically (i.e., without barriers such as reservoirs),
small, isolated populations that may now be comprised predominantly of
adult individuals could be slowly dying out. Even given the very
improbable absence of other anthropogenic threats, these disjunct
populations could be lost simply due to the consequences of below-
threshold effective population sizes. Because only 60 primarily
disjunct streams among 160 historically occupied areas continue to
harbor populations of the longsolid, and 69 primarily disjunct streams
of 301 historically occupied areas continue to harbor populations of
the round hickorynut, this is likely partial testimony to the principle
of effective population size and its role in population loss.
The longsolid and round hickorynut exhibit several traits that
influence population viability, including relatively small population
size and low fecundity at many locations compared to other mussels (see
appendix A in Service 2018 and 2019). Small population size puts the
species at greater risk of extirpation from stochastic events (e.g.,
drought) or anthropomorphic changes and management activities that
affect habitat. In addition, small longsolid or round hickorynut
populations may have reduced genetic diversity, be less genetically
fit, and be more susceptible to disease during extreme environmental
conditions compared to large populations (Frankham 1996, p. 1,505).
Genetic drift occurs in all species, but the lack of drift is more
likely to negatively affect populations that have a smaller effective
population size (number of breeding individuals) and populations that
are geographically spread out and isolated from one another. Relatively
low fecundity, commonly observed in species of Fusconaia, is another
inherent factor that could influence population viability (Geist 2010,
p. 91). Survival of juveniles in the wild is already low, and females
produce fewer offspring than other mussel species (Haag and Staton
2003, p. 2,125). Factors such as low effective population size, genetic
isolation, relatively low levels of fecundity and recruitment, and
limited juvenile survival could all affect the ability of these species
to maintain current population levels and to rebound if a reduction in
population occurs (e.g., through predation, toxic releases or spills,
or poor environmental conditions that inhibit successful reproduction).
Additionally, based on our presumption of fish hosts of the longsolid
and the known species of fish hosts for the round hickorynut, they are
small-bodied fishes that have comparatively limited movement (Vaughn
2012, p. 6); therefore, natural expansion of longsolid and round
hickorynut populations is limited.
Dendritic (branched) streams and rivers are highly susceptible to
fragmentation and may result in multiple habitat fragments and isolated
populations of variable size (Fagan 2002, p. 3,247). In contrast to
landscapes where multiple routes of movement among patches are
possible, pollution or other habitat degradation at specific points in
dendritic landscapes can completely isolate portions of the system
(Fagan 2002, p. 3,246).
Future Conditions
In the SSA reports, we forecast the longsolid's and round
hickorynut's response to plausible future scenarios of environmental
conditions and conservation efforts. The future scenarios project the
threats into the future and consider the impacts those threats could
have on the viability of the longsolid and round hickorynut. We apply
the concepts of resiliency, redundancy, and representation to the
future scenarios to describe possible future conditions of the
longsolid and round hickorynut. The scenarios described in the SSA
reports represent only three possible future conditions for each of the
species. Uncertainty is inherent in any risk assessment, so we must
consider plausible conditions to make our determinations. Viability is
not a specific state, but rather a continuous measure of the likelihood
that the species will sustain populations over time.
In the SSA reports, we considered three future scenarios. Scenario
1 assesses the species' response to factors influencing current
longsolid and round hickorynut populations and management units,
assuming the current level of impacts remains constant into the future.
Scenario 2 assesses the species' response when factors that negatively
influence most of the extant populations and management units are
reduced by additional conservation. Scenario 3 assesses the species'
response to worsening conditions of the factors that most influence the
species due to the implementation of known existing and projected
development, resource extraction, hydroelectric projects, etc. An
important assumption of the predictive analysis presented herein is
that future population resiliency for each species is largely dependent
on water quality, water flow, instream habitat conditions, and
condition of riparian vegetation (see Species Needs, above).
The future conditions timeframe for our analysis is different for
each species. A timeframe of 50 to 70 years into the future is
evaluated for the longsolid, and 20 to 30 years into the future is
evaluated for the round hickorynut. We selected these timeframes based
on the availability of trends and threat information, planning
documents, and climate modeling that could be reliably projected into
the future, and also the consideration of at least two generations for
each species (i.e., 25 to 35 years for the long-lived longsolid, and on
average 12-13 years (Shepard 2006, p. 7; Ehlo and Layzer 2014, p. 11)
for the round hickorynut).
Longsolid
Our assessment predicts that if conditions remain the same or
worsen into the future, all 60 populations would experience negative
changes to the species' important habitat requisites (see Species
Needs, above), including the loss of the single remaining population in
the Cumberland River basin, and potentially resulting in no highly
resilient populations (Scenario 3). Alternatively, the scenario that
incorporates additive conservation measures beyond those currently
implemented (Scenario 2) could result in the continued persistence of
all 60 populations in the future. However, we note that approximately
30 of 60 (50 percent) of these are currently low condition populations,
based on either surveys that pre-date 2000 or on the collection of only
five or fewer older, non-reproducing individuals. Some of these
populations may already be extirpated. The risks facing the longsolid
populations varied among scenarios and are summarized below
[[Page 14809]]
(see table 8-1 and table ES-1 in the SSA report).
Under Scenario 1, lowered resiliency, representation, and
redundancy are expected. Under this scenario, we predict that 1
population of the current 3 high condition populations would remain in
high condition, 6 populations (10 percent) in medium condition, and 15
populations (25 percent) in low condition. Redundancy would be reduced
with likely extirpation of 38 out of 60 (63 percent) currently extant
populations; only the Ohio River basin (one of the three basins
currently occupied by the species) would retain one highly resilient
population (i.e., the Green River population in the Upper Green
management unit). Representation would be reduced, with two of the
three currently occupied river basins continuing to harbor longsolid
populations.
Under Scenario 2, we predict higher levels of resiliency in some
areas of the longsolid's range than was estimated for Scenario 1;
representation and redundancy would remain the same level as current
conditions, with the species continuing to occur within all currently
occupied management units and States across its range. Seven
populations (12 percent) are predicted to be in high condition,
compared to the current four populations in high condition. Scenario 2
also predicts 20 populations (33 percent) in medium condition and 33
populations (52 percent) in low condition; no populations would become
extirpated. All three currently occupied major river basins would
remain occupied, and the existing levels of redundancy and
representation would improve. It is possible that this scenario is the
least likely to occur in the future as compared to Scenario 1 or 3 only
because it will take many years (potentially beyond the 50- to 70-year
timeframe analyzed in the SSA report) for all of the beneficial effects
of management actions that are necessary to be implemented and realized
on the landscape.
Under Scenario 3, we predict a significant decrease in resiliency,
representation, and redundancy across the species' range. Redundancy
would be reduced from three major river basins to two basins with no
high condition populations remaining, and the likely extirpation of 44
(73 percent) of the currently extant populations. The resiliency of the
remaining 16 populations is expected to be reduced to 3 populations (5
percent) in medium condition and 13 (22 percent) in low condition. In
addition to the loss of 44 populations, 32 (29 percent) of the
management units are predicted to become extirpated. Representation
would be reduced to 13 management units, 2 major river basins, and 3
States (as compared to the current 9 States) occupied by the species.
Round Hickorynut
Our assessment predicts that if conditions remain the same
(Scenario 1), 44 of 69 populations (62 percent) would experience
negative changes to the important habitat requisites, including the
potential loss of 23 populations. This includes the predicted
extirpation of the two populations in the Cumberland River basin and
the population in the Lower Mississippi River basin. Additionally,
under Scenario 3, no highly resilient populations are able to persist,
and 90 percent of remaining populations are in low condition.
Alternatively, the scenario that includes additive conservation
measures beyond those currently implemented (Scenario 2) could result
in the continued persistence of all 69 populations in the future.
However, approximately 49 of 69 (71 percent) of these populations are
currently in low condition. Many of the known populations of the round
hickorynut have been collected as 10 or fewer individuals, with limited
extent information available, due to the lack of survey effort
targeting the species (Service 2019, appendix A). The risks facing
round hickorynut populations varied among scenarios and are summarized
below (see also table 8-1 and table ES-1 in the SSA report).
Under Scenario 1, lowered resiliency, representation, and
redundancy are expected. We predict that only one of the current four
high condition populations would remain in high condition. Under this
scenario, only the Great Lakes basin (one of the five basins currently
occupied by the species) would retain a highly resilient population
(i.e., the Grand River). Of the 69 extant populations, 14 (20 percent)
would be in medium condition and 31 (45 percent) would be in low
condition. We estimate extirpation of 23 out of 69 (33 percent)
populations. Redundancy would decline due to these population and
management unit losses, resulting in a loss of the species from
Pennsylvania and Mississippi. Representation would be reduced through
extirpation of populations and management units in the Cumberland and
Great Lakes basins, a 40 percent loss of redundancy compared to current
conditions. Under this scenario, only three of the five currently
occupied river basins (Great Lakes, Ohio, and Tennessee) continue to
harbor round hickorynut populations.
Under Scenario 2, we predict higher levels of resiliency in some
areas of the round hickorynut's range than is estimated for Scenario 1;
representation and redundancy would remain the same level as current
conditions with the species continuing to occur within all currently
occupied management units and States across the species' 9-State range.
Up to 15 populations (23 percent) are predicted to be high condition
compared to the current 4 populations in high condition. Scenario 2
also predicts 39 populations (56 percent) in medium condition and 15
populations (22 percent) in low condition. All currently occupied major
river basins would remain occupied, and the existing levels of
redundancy and representation would improve. There are sufficient
population sizes within each basin to facilitate augmentation and
restoration efforts, whether it be within-basin translocations or
captive propagation techniques. It is possible that this scenario is
the least likely to occur in the future as compared to Scenario 1 or 3.
This is because it will take many years (potentially beyond the 20- to
30-year time frame analyzed in the SSA report) for all of the
beneficial effects of management actions that are necessary to be
implemented on the landscape to be realized.
Under Scenario 3, we predict a significant decrease in resiliency,
representation, and redundancy across the species' range. Redundancy
would be reduced from five major river basins to three basins, with
extirpations expected to occur in the Cumberland and Lower Mississippi
River basins. No high condition populations would remain, and 49 (71
percent) of the 69 extant populations are likely to become extirpated.
The resiliency of the remaining 20 populations is expected to be
reduced to 2 populations (10 percent) in medium condition and 18 (90
percent) in low condition. In addition to the potential loss of 49
populations, 23 (68 percent) of the currently extant 36 management
units are predicted to no longer harbor the species. Representation
could be reduced to 14 management units across 3 major river basins.
Extirpations are expected from the States of Pennsylvania, Michigan,
and Mississippi, leaving 6 States (as compared to the current 9, and
historically 12) occupied by the species.
Determination of Status for the Longsolid and Round Hickorynut
Introduction
Section 4 of the Act (16 U.S.C. 1533) and its implementing
regulations (50 CFR part 424) set forth the procedures
[[Page 14810]]
for determining whether a species meets the definition of an endangered
species or a threatened species. The Act defines an ``endangered
species'' as a species in danger of extinction throughout all or a
significant portion of its range, and a ``threatened species'' as a
species likely to become an endangered species within the foreseeable
future throughout all or a significant portion of its range. The Act
requires that we determine whether a species meets the definition of
endangered species or threatened species because of any of the
following factors: (A) The present or threatened destruction,
modification, or curtailment of its habitat or range; (B)
Overutilization for commercial, recreational, scientific, or
educational purposes; (C) Disease or predation; (D) The inadequacy of
existing regulatory mechanisms; or (E) Other natural or manmade factors
affecting its continued existence.
In conducting our status assessment of the longsolid and round
hickorynut, we evaluated all identified threats under the Act's section
4(a)(1) factors and assessed how the cumulative impact of all threats
acts on the viability of the species as a whole. That is, all the
anticipated effects from both habitat-based and direct mortality-based
threats are examined in total and then evaluated in the context of what
those combined negative effects will mean to the current and future
condition of the longsolid and round hickorynut. However, for the vast
majority of potential threats, the effect on the longsolid and round
hickorynut (e.g., total losses of individual mussels or their habitat)
cannot be quantified with available information. Instead, we use the
best available information to gauge the magnitude of each individual
threat on the longsolid and round hickorynut, and then assess how those
effects combined (and as may be ameliorated by any existing regulatory
mechanisms or conservation efforts) will impact the longsolid's or
round hickorynut's current and future viability.
Longsolid--Status Throughout All of Its Range
After evaluating threats to the species and assessing the
cumulative effect of the threats under the section 4(a)(1) factors, we
determined that the species' distribution and abundance has been
reduced across its range as demonstrated by both the number of occupied
management units and the number of populations where it historically
occurred. Historically, the species occurred within 160 populations and
105 management units across 12 States; currently, the species occurs in
60 populations and 45 management units across 9 States, which
represents a 62 percent reduction of its historically occupied
populations (although we note that the remaining populations are well-
distributed as opposed to concentrated within its range). The
conditions of the remaining 60 extant populations vary between being
highly resilient, moderately resilient, or having low resiliency (see
Current Conditions, above, and section 5.2 in the SSA report (Service
2018, pp. 34-37)).
Currently, 3 populations (5 percent) are highly resilient, 8 (13
percent) are moderately resilient, and 49 (71 percent) have low
resiliency. Although downward trends are evident compared to historical
information, 11 highly to moderately resilient populations are present
within three of the four major river basins the species is historically
known to occupy. Current and ongoing threats from habitat degradation
or loss (Factor A), residual impacts from past harvest and
overutilization (Factor B), and invasive, nonnative species (Factor E)
contribute to the species' negative effects associated with small
population size (Factor E). The continued occupancy of these 11
populations (in addition to some survey information) implies that
recent recruitment is occurring in some populations to help maintain a
level of resiliency, redundancy, and representation. Thus, after
assessing the best available information, we conclude that the
longsolid is not currently in danger of extinction throughout all of
its range. Therefore, we proceed with determining whether the longsolid
is likely to become an endangered species within the foreseeable future
throughout all of its range.
At this point in time, and as noted above, the threats currently
acting on the species include habitat degradation or loss from a
variety of sources and invasive, nonnative species, all of which
contribute to the negative effects associated with the species' small
population size. Our analysis revealed that these threats are likely to
continue into the foreseeable future, or approximately 50 to 70 years.
This timeframe accounts for reasonable predictions of threats
continuing into the future based on our examination of empirical data
available over the last 30 years (e.g., survey data, how threats are
manifesting themselves on the landscape and the species, implementation
of management plans and voluntary conservation actions), and also takes
into consideration the biology of the species (multiple generations of
a long-lived species) and the licensing schedules of dams within the
species' range.
The best available information, including our consideration of
comments we received on the September 29, 2020 (85 FR 61384), proposed
rule, indicates that the threats currently acting upon the longsolid
are expected to continue into the foreseeable future, some of which
(e.g., water quality and habitat degradation, and invasive, nonnative
species) are reasonably expected to worsen over time, including
concurrent with increasing human population trends that further reduce
the species' resiliency, redundancy, and representation across its
range. Our analysis reveals the potential for either none or a single
population (i.e., the Green River in Kentucky) to persist as highly
resilient (i.e., continued reproduction with varied age classes
present) in the foreseeable future, assuming threats remain or worsen
on the landscape. Additionally, the majority of the remaining
populations would exhibit low resiliency, while many (between 30 and 73
percent of the current low condition populations) would potentially
become extinct or functionally extinct (e.g., significant habitat
degradation; no reproduction due to highly isolated, non-recruiting
individuals). Our future analysis also reveals a high risk that the
species would become extirpated in one of the four historically
occupied river basins (i.e., Cumberland River basin); it has already
been lost from the Great Lakes basin. Thus, after assessing the best
available information, we conclude that the longsolid is not currently
in danger of extinction but is likely to become in danger of extinction
within the foreseeable future throughout all of its range.
Longsolid--Status Throughout a Significant Portion of Its Range
Under the Act and our implementing regulations, a species may
warrant listing if it is in danger of extinction or likely to become so
in the foreseeable future throughout all or a significant portion of
its range. The court in Center for Biological Diversity v. Everson, 435
F. Supp. 3d 69 (D.D.C. 2020) (Everson), vacated the aspect of the Final
Policy on Interpretation of the Phrase ``Significant Portion of Its
Range'' in the Endangered Species Act's Definitions of ``Endangered
Species'' and ``Threatened Species'' (Final Policy; 79 FR 37578; July
1, 2014) that provided that the Service does not undertake an analysis
of significant portions of a species' range if the species warrants
listing as threatened throughout all of its range.
[[Page 14811]]
Therefore, we proceed to evaluating whether the species is
endangered in a significant portion of its range--that is, whether
there is any portion of the species' range for which both (1) the
portion is significant; and (2) the species is in danger of extinction
in that portion. Depending on the case, it might be more efficient for
us to address the ``significance'' question or the ``status'' question
first. We can choose to address either question first. Regardless of
which question we address first, if we reach a negative answer with
respect to the first question that we address, we do not need to
evaluate the other question for that portion of the species' range.
Following the court's holding in Everson, we now consider whether
there are any significant portions of the species' range where the
species is in danger of extinction now (i.e., endangered). In
undertaking this analysis for the longsolid, we choose to address the
status question first--we consider information pertaining to the
geographic distribution of both the species and the threats that the
species faces to identify portions of the range where the species may
be in danger of extinction.
We evaluated the range of the longsolid to determine if the species
is in danger of extinction now in any portion of its range. The range
of a species can theoretically be divided into portions in an infinite
number of ways. We examined the species entire range in an attempt to
focus this analysis on portions of the species' range that may meet the
definition of an endangered species. For the longsolid, we considered
whether the threats or their effects on the species are greater in any
biologically meaningful portion of the species' range than in other
portions such that the species is in danger of extinction now in that
portion.
The statutory difference between an endangered species and a
threatened species is the timeframe in which the species becomes in
danger of extinction; an endangered species is in danger of extinction
now while a threatened species is not in danger of extinction now but
is likely to become so in the foreseeable future. Thus, we considered
the time horizon for the threats that are driving the longsolid to
warrant listing as a threatened species throughout all of its range. We
then considered whether these threats or their effects are occurring in
any portion of the species' range such that the species is in danger of
extinction now in that portion of its range. We examined the following
threats: habitat degradation or loss; invasive, nonnative species;
effects associated with small population size; and the potential for
cumulative effects. We also considered whether these threats may be
exacerbated by small population size (or low condition). Overall, we
found that threats are likely acting on individuals or populations, or
even basins, similarly across the species' range. These threats are
certain to occur, and in those basins with few populations that are
predominantly in low condition, these populations are facing the same
threats, and these threats can be of greater magnitude in some areas or
of greater impact, given small population sizes.
One basin--the Cumberland River--has been reduced by 91 percent
with one remaining low condition population. Although there are low
condition populations in all three basins in which the species occurs,
because this basin has seen its populations significantly reduced to a
single population currently in low condition, this circumstance--in
combination with the other threats acting on the species throughout its
range--may indicate that the species may be in danger of extinction now
in this portion of the range.
Small, isolated populations often exhibit reduced levels of genetic
variability, which diminishes the species' capacity to adapt and
respond to environmental changes, thereby decreasing the probability of
long-term persistence. Small populations may experience reduced
reproductive vigor, for example, due to inbreeding depression. Isolated
individuals may have difficulty reproducing. The problems associated
with small population size and vulnerability to random demographic
fluctuations or natural catastrophes are further magnified by
synergistic interactions with other threats, such as those discussed
above. Based on our review of information and the synergistic effects
of threats exacerbated by a single low-condition population in the
Cumberland River basin, we find that this basin is a portion of the
longsolid's range with a potential difference in biological condition.
Because we have determined the Cumberland River basin is a portion
of the range that may be in danger of extinction now, we next evaluate
whether this portion may be significant. We first examined this area's
contribution to the resiliency, redundancy, and representation of the
species. We determined that this basin contains 1 of 60 populations
(1.7 percent) identified in the SSA report. Therefore, this single
population does not contribute significantly, either currently or in
the foreseeable future, to the species' total resiliency at a
biologically meaningful scale compared to other representative areas.
The overall representation described herein would likely be the same
under two of the three scenarios. We conclude that the Cumberland River
basin population does not contribute meaningfully to the species'
viability overall. We evaluated the best available information for the
Cumberland River basin in this context, assessing its significance in
terms of these conservation concepts and determined that this single
portion is not biologically significant to the species.
The single population in the Cumberland River basin does not act as
a refugia for the species or as an important spawning ground. In
addition, the water quality is similar throughout the species' range
with impaired water quality occurring in all three basins. Since the
longsolid occurs in similar aquatic habitats across its range, the
Cumberland River basin portion provides similar habitat characteristics
as the remainder of the range. Therefore, there are no unique habitat
characteristics attributable to just the Cumberland River basin portion
of the range, and this portion serves a similar role in supporting the
species' viability as compared to the rest of the range.
Overall, and in summary, we found one portion of the longsolid's
range, the Cumberland River basin, that may have a different status as
compared to the remaining portion of the longsolid's range. We found
the Cumberland River basin was not a biologically meaningful portion of
the longsolid's range; in other words, we found it was not significant
in terms of its overall contribution to the species' resiliency,
redundancy, and representation, nor was it found to be significant in
terms of high-quality habitat or habitat that is otherwise important
for the species' life history. As a result, while Cumberland River
basin may have a different status, we determined it is not a
significant portion of the range. Accordingly, no portion of the
longsolid's range provides a basis for determining that the species is
in danger of extinction in a significant portion of its range, and we
determine that the species is likely to become in danger of extinction
within the foreseeable future throughout all of its range. This does
not conflict with the courts' holdings in Desert Survivors v. U.S.
Department of the Interior, 321 F. Supp. 3d 1011, 1070-74 (N.D. Cal.
2018) and Center for Biological Diversity v. Jewell, 248 F. Supp. 3d
946, 959 (D. Ariz. 2017) because, in reaching this conclusion, we did
not apply the aspects of the Final
[[Page 14812]]
Policy, including the definition of ``significant'' that those court
decisions held to be invalid.
Longsolid--Determination of Status
Our review of the best available scientific and commercial
information indicates that the longsolid meets the definition of a
threatened species. Therefore, we are listing the longsolid as a
threatened species in accordance with sections 3(20) and 4(a)(1) of the
Act.
Round Hickorynut--Status Throughout All of Its Range
After evaluating threats to the species and assessing the
cumulative effect of the threats under the Act's section 4(a)(1)
factors, we determined that the round hickorynut's abundance has been
reduced across its range as demonstrated by both number of occupied
management units and the number of populations where the species has
historically occurred. Historically, the species occurred within 301
populations and 138 management units across 12 States (plus at least 10
populations and 8 management units within the Canadian Province of
Ontario); currently, the species occurs in 69 populations and 36
management units across 9 States, which represents a 77 percent
reduction of its historically occupied populations (although we note
that the remaining populations are widely distributed as opposed to
concentrated within its range). The species also continues to occur in
Canada, although it is estimated to have declined by greater than 92
percent, as reported in 2013 (Committee on the Status of Species at
Risk in Ontario 2013, p. 4). The conditions of the remaining 69
currently extant populations in the United States vary between being
highly resilient, moderately resilient, or having low resiliency (see
Current Conditions, above, and section 5.2 in the SSA report (Service
2019, pp. 43-47)).
Currently, 4 round hickorynut populations (6 percent) are highly
resilient, 16 (23 percent) are moderately resilient, and 49 (71
percent) have low resiliency. Although downward trends are evident
compared to historical information, 20 highly to moderately resilient
populations in the United States continue to occupy 4 of the 5 major
river basins where the species is historically known to occur. Current
and ongoing threats from habitat degradation or loss (Factor A), and
invasive, nonnative species (Factor E), contribute to the negative
effects associated with the species' small population size (Factor E).
The continued occupancy of these 20 populations (in addition to some
survey information) implies that recent recruitment is occurring in
some populations, and they maintain a level of resiliency, redundancy,
and representation. Thus, after assessing the best available
information, we conclude that the round hickorynut is not currently in
danger of extinction throughout all of its range. Therefore, we proceed
with determining whether the round hickorynut is likely to become an
endangered species within the foreseeable future throughout all of its
range.
As noted above, the threats acting on the species include habitat
degradation or loss from a variety of sources and invasive, nonnative
species, both of which contribute to the negative effects associated
with the species' small population size. Our analysis revealed that
these threats are likely to continue into the foreseeable future, or
approximately 20 to 30 years. This timeframe accounts for reasonable
predictions of threats continuing into the future based on our
examination of empirical data in our files (e.g., survey data, how
threats are manifesting themselves on the landscape and the species,
implementation of management plans and voluntary conservation actions),
and also takes into consideration the biology of the species and the
licensing schedules of dams within the species' range.
The best available information, including our consideration of
comments we received on the September 29, 2020 (85 FR 61384), proposed
rule, suggests that the threats currently acting upon the round
hickorynut are expected to continue into the foreseeable future. The
effects of water quality and habitat degradation, and invasive,
nonnative species, are reasonably expected to worsen over time,
including concurrent with increasing human population trends, thus
further reducing the species' resiliency, redundancy, and
representation across its range. Our analysis reveals the potential for
either none or a single population (i.e., the Grand River in Ohio) to
persist as highly resilient (i.e., continued reproduction with varied
age classes present) in the foreseeable future, assuming threats remain
or worsen on the landscape. Additionally, the majority of the remaining
populations would exhibit low resiliency, while many (between 33 and 71
percent of the current low condition populations) would potentially
become extinct or functionally extinct (e.g., significant habitat
degradation; no reproduction due to highly isolated, non-recruiting
individuals). Our future analysis also reveals a high risk that the
species would become extirpated in two of the five historically
occupied river basins (i.e., Cumberland River basin and Lower
Mississippi River basin). Overall, the current threats acting on the
species and its habitat are expected to continue, and there are no
indications that these threats would be lessened or that declining
population trends would be reverted. Thus, after assessing the best
available information, we conclude that the round hickorynut is not
currently in danger of extinction but is likely to become in danger of
extinction within the foreseeable future throughout all of its range.
Round Hickorynut--Status Throughout a Significant Portion of Its Range
See above, under Longsolid--Status Throughout a Significant Portion
of Its Range, for a description of our evaluation methods and our
policy application.
In undertaking the analysis for the round hickorynut, we choose to
address the status question first--we consider information pertaining
to the geographic distribution of both the species and the threats that
the species faces to identify portions of the range where the species
may be endangered.
We evaluated the range of the round hickorynut to determine if the
species is in danger of extinction now in any portion of its range. The
range of a species can theoretically be divided into portions in an
infinite number of ways. We examined the species entire range in an
attempt to focus this analysis on portions of the species' range that
may meet the definition of an endangered species. For the round
hickorynut, we considered whether the threats or their effects on the
species are greater in any biologically meaningful portion of the
species' range than in other portions such that the species is in
danger of extinction now in that portion.
As similarly described above for the longsolid, the statutory
difference between an endangered species and a threatened species is
the timeframe in which the species becomes in danger of extinction; an
endangered species is in danger of extinction now while a threatened
species is not in danger of extinction now but is likely to become so
in the foreseeable future. Thus, we considered the time horizon for the
threats that are driving the round hickorynut to warrant listing as a
threatened species throughout all of its range. We then considered
whether these threats or their effects are occurring in any portion of
the species' range such that the species is in danger
[[Page 14813]]
of extinction now in that portion of its range. We examined the
following threats: habitat degradation or loss; invasive, nonnative
species; negative effects associated with small population size; and
the potential for cumulative effects. We also considered whether these
threats may be exacerbated by small population size (or low condition).
Overall, we found that threats are likely acting on individuals or
populations, or even basins, similarly across the species' range. These
threats are certain to occur, and in those basins with few populations
that are predominantly in low condition, these populations are facing
the same threats, and these threats can be of greater magnitude in some
areas or of greater impact, given small population sizes.
Three of five basins where round hickorynut has historically
occurred (Great Lakes, Cumberland River, and Lower Mississippi River
basins) have been reduced to predominantly low condition populations.
Specifically, the Great Lakes basin has been reduced from 25
populations to 5 low condition populations, 1 medium condition
population, and 1 high condition population; the Cumberland River basin
has been reduced from 23 populations to 2 low condition populations;
and the Lower Mississippi River basin has been reduced from 9
populations to a single remaining low condition population. Although
there are low condition populations in every basin in which the species
occurs, because these three basins have seen their populations
significantly reduced and a predominance of the Great Lakes basin
populations and the remaining populations for the other two basins are
currently in low condition, these circumstances--in combination with
the other threats acting on the species throughout its range--may
indicate that the species may be in danger of extinction now in these
portions of the range.
As similarly described above for the longsolid, small, isolated
populations often exhibit reduced levels of genetic variability, which
diminishes the species' capacity to adapt and respond to environmental
changes, thereby decreasing the probability of long-term persistence.
Small populations may experience reduced reproductive vigor, for
example, due to inbreeding depression. Isolated individuals may have
difficulty reproducing. The problems associated with small population
size and vulnerability to random demographic fluctuations or natural
catastrophes are further magnified by synergistic interactions with
other threats, such as those discussed above. Based on our review of
information and the synergistic effects of threats exacerbated by a
predominance of populations in low condition within the Great Lakes,
Cumberland, and Lower Mississippi River basins (where populations have
been significantly extirpated), we find that these three basins are
portions of the round hickorynut's range with a potential difference in
biological condition.
Because we have determined the Great Lakes, Cumberland, and Lower
Mississippi River basins are portions of the range that may be in
danger of extinction now, we next evaluate whether those portions may
be significant (see additional discussion above for the longsolid). We
first examined each of these area's contributions to the resiliency,
redundancy, and representation of the species. Although these basins
contain 10 of 69 populations (15 percent) identified in the SSA report,
the Great Lakes basin consists of 1 population currently with moderate
resiliency and 1 with high resiliency, and the remaining 5 populations
demonstrate low resiliency; the remaining 3 populations in the
Cumberland River basin and the Lower Mississippi River basin are all
low condition populations. These low condition populations do not
contribute significantly, either currently or in the foreseeable
future, to the species' total resiliency at a biologically meaningful
scale compared to other representative areas. Although the low
condition populations in these basins are relatively small, the current
and future redundancy suggests that threats would be unlikely to
extirpate round hickorynut in the Great Lakes basin, but there is
potential to lose the remaining three low condition populations under
the current level of threats scenario (Scenario 1). Overall
representation would be modified through loss of two currently occupied
basins. We evaluated the best available information for the Great
Lakes, Cumberland River, and Lower Mississippi River basins in this
context, assessing each portion's significance in terms of these
conservation concepts (i.e., resiliency, representation, and
redundancy), and determined that there is not substantial information
to indicate that any of these areas may be biologically significant to
the species.
Round hickorynut populations are widely distributed over nine
States and five major river basins, and we considered geographic range
as a surrogate for geographic variation and proxy for potential local
adaptation and adaptive capacity. A river basin is any area of land
where precipitation collects and drains off into a common outlet, such
as into a river, bay, or other body of water. The river basin includes
all the surface water from precipitation runoff and nearby streams that
run downslope towards the shared outlet, as well as the groundwater
underneath the earth's surface. River basins connect into other
drainage basins at lower elevations in a hierarchical pattern, with
smaller sub-drainage basins. Given there are no data indicating genetic
or morphological differentiation between the five major river basins
for the species, and these specific portions of the range do not
provide high value or high quality habitat to the species as compared
to the rest of the range, we conclude that these areas are not
biologically significant to the round hickorynut. Further, the round
hickorynut occurs in similar aquatic habitats across its range and does
not use unique observable environmental or behavioral characteristics
attributable to just the Great Lakes, Cumberland River, or Lower
Mississippi River basin populations. Therefore, the species exhibits
similar basin-scale use of habitat.
The Great Lakes, Cumberland River, and Lower Mississippi River
basin portions occur in stream habitat comprised of substrate types
similar to the other basins where the round hickorynut performs the
important life-history functions of breeding, feeding, and sheltering,
and occur in areas with water quality sufficient to sustain these
essential life-history traits. These three basins do not act as refugia
for the species or as an important spawning ground. In addition, the
water quality is similar throughout the species' range with impaired
water quality occurring in all basins. Since the round hickorynut
occurs in similar aquatic habitats across its range, the Great Lakes,
Cumberland River, and Lower Mississippi River basin portions provide
similar habitat characteristics as the remainder of the species' range.
Therefore, there are no unique habitat characteristics attributable to
just these basins, and these portions serve a similar role in
supporting the species' viability as compared to the rest of the range.
Overall, and in summary, we found three portions of the round
hickorynut's range--the Great Lakes, Cumberland, and Lower Mississippi
River basins--that may have a different status then the remaining
portion of the round hickorynut's range. Our analysis indicated these
three basins are not significant in terms of their contribution to the
species' resiliency, redundancy,
[[Page 14814]]
and representation, nor were they found to be significant in terms of
high-quality habitat or habitat that is otherwise important for the
species' life history. As a result, while these portions may have a
different biological status, we determined they are not significant
portions of the species' range. Accordingly, no portion of the round
hickorynut's range provides a basis for determining that the species is
in danger of extinction in a significant portion of its range, and we
determine that the round hickorynut is likely to become in danger of
extinction within the foreseeable future throughout all of its range.
This does not conflict with the courts' holdings in Desert Survivors v.
U.S. Department of the Interior, 321 F. Supp. 3d 1011, 1070-74 (N.D.
Cal. 2018) and Center for Biological Diversity v. Jewell, 248 F. Supp.
3d 946, 959 (D. Ariz. 2017) because, in reaching this conclusion, we
did not apply the aspects of the Final Policy, including the definition
of ``significant'' that those court decisions held to be invalid.
Round Hickorynut--Determination of Status
Our review of the best available scientific and commercial
information indicates that the round hickorynut meets the definition of
a threatened species. Therefore, we are listing the round hickorynut as
a threatened species in accordance with sections 3(20) and 4(a)(1) of
the Act.
Available Conservation Measures
Conservation measures provided to species listed as endangered or
threatened species under the Act include recognition as a listed
species, planning and implementation of recovery actions, requirements
for Federal protection, and prohibitions against certain practices.
Recognition through listing results in public awareness, and
conservation by Federal, State, Tribal, and local agencies, private
organizations, and individuals. The Act encourages cooperation with the
States and other countries and calls for recovery actions to be carried
out for listed species. The protection required by Federal agencies,
including the Service, and the prohibitions against certain activities
are discussed, in part, below.
The primary purpose of the Act is the conservation of endangered
and threatened species and the ecosystems upon which they depend. The
ultimate goal of such conservation efforts is the recovery of these
listed species, so that they no longer need the protective measures of
the Act. Section 4(f) of the Act calls for the Service to develop and
implement recovery plans for the conservation of endangered and
threatened species. The goal of this process is to restore listed
species to a point where they are secure, self-sustaining, and
functioning components of their ecosystems.
Recovery planning consists of preparing draft and final recovery
plans, beginning with the development of a recovery outline shortly
after a species is listed. The recovery outline guides the immediate
implementation of urgent recovery actions and describes the process to
be used to develop a recovery plan. Revisions of the plan may be done
to address continuing or new threats to the species, as new substantive
information becomes available. The recovery plan also identifies
recovery criteria for review of when a species may be ready for
reclassification from endangered to threatened (``downlisting'') or
removal from protected status (``delisting''), and methods for
monitoring recovery progress. Recovery plans also establish a framework
for agencies to coordinate their recovery efforts and provide estimates
of the cost of implementing recovery tasks. Recovery teams (composed of
species experts, Federal and State agencies, nongovernmental
organizations, and stakeholders) are often established to develop
recovery plans. When completed, the recovery outline, draft recovery
plan, and the final recovery plan will be available on our websites
(https://ecos.fws.gov/ecp/species/9880, and https://ecos.fws.gov/ecp/species/9879), or from our Asheville Ecological Services Field Office
(see FOR FURTHER INFORMATION CONTACT).
Implementation of recovery actions generally requires the
participation of a broad range of partners, including other Federal
agencies, States, Tribes, nongovernmental organizations, businesses,
and private landowners. Examples of recovery actions include habitat
restoration (e.g., restoration of native vegetation), research, captive
propagation and reintroduction, and outreach and education. The
recovery of many listed species cannot be accomplished solely on
Federal lands because their range may occur primarily or solely on non-
Federal lands. To achieve recovery of these species requires
cooperative conservation efforts on private, State, and Tribal lands.
Following publication of this rule, funding for recovery actions
will be available from a variety of sources, including Federal budgets,
State programs, and cost-share grants for non-Federal landowners, the
academic community, and nongovernmental organizations. In addition,
pursuant to section 6 of the Act, the States of New York, Pennsylvania,
Ohio, Indiana, Michigan, Kentucky, West Virginia, Virginia, North
Carolina, Tennessee, Alabama, and Mississippi would be eligible for
Federal funds to implement management actions that promote the
protection or recovery of the longsolid or round hickorynut or both
species. Information on our grant programs that are available to aid
species recovery can be found at: https://www.fws.gov/service/financial-assistance.
Please let us know if you are interested in participating in
recovery efforts for the longsolid or round hickorynut. Additionally,
we invite you to submit any new information on these species whenever
it becomes available and any information you may have for recovery
planning purposes (see FOR FURTHER INFORMATION CONTACT).
Section 7(a) of the Act requires Federal agencies to evaluate their
actions with respect to any species that is listed as an endangered or
threatened species and with respect to its critical habitat, if any is
designated. Regulations implementing this interagency cooperation
provision of the Act are codified at 50 CFR part 402. Section 7(a)(2)
of the Act requires Federal agencies to ensure that activities they
authorize, fund, or carry out are not likely to jeopardize the
continued existence of any endangered or threatened species or destroy
or adversely modify its critical habitat. If a Federal action may
affect a listed species or its critical habitat, the responsible
Federal agency (action agency) must enter into consultation with the
Service.
Federal agency actions within the species' habitat that may require
conference, consultation, or both as described in the preceding
paragraph may include management and any other landscape-altering
activities on Federal lands administered by the following agencies:
(1) U.S. Army Corps of Engineers (channel dredging and maintenance;
dam projects including flood control, navigation, hydropower, bridge
projects, stream restoration, and Clean Water Act permitting).
(2) U.S. Department of Agriculture, including the Natural Resources
Conservation Service and Farm Service Agency (technical and financial
assistance for projects) and the Forest Service (aquatic habitat
restoration, fire management plans, fire suppression, fuel reduction
treatments, forest plans, mining permits).
[[Page 14815]]
(3) U.S. Department of Energy (renewable and alternative energy
projects).
(4) Federal Energy Regulatory Commission (interstate pipeline
construction and maintenance, dam relicensing, and hydrokinetics).
(5) U.S. Department of Transportation (highway and bridge
construction and maintenance).
(6) U.S. Fish and Wildlife Service (issuance of section 10 permits
for enhancement of survival, habitat conservation plans, and safe
harbor agreements; National Wildlife Refuge planning and refuge
activities; Partners for Fish and Wildlife program projects benefiting
these species or other listed species; Wildlife and Sportfish
Restoration program sportfish stocking).
(7) Environmental Protection Agency (water quality criteria,
permitting).
(8) Tennessee Valley Authority (flood control, navigation,
hydropower, and land management for the Tennessee River system).
(9) Office of Surface Mining Reclamation and Enforcement (land
resource management plans, mining permits, oil and natural gas permits,
abandoned mine land projects, and renewable energy development).
(10) National Park Service (aquatic habitat restoration, fire
management plans, fire suppression, fuel reduction treatments, land
management plans, mining permits).
It is our policy, as published in the Federal Register on July 1,
1994 (59 FR 34272), to identify to the maximum extent practicable at
the time a species is listed, those activities that would or would not
constitute a violation of section 9 of the Act. The intent of this
policy is to increase public awareness of the effect of a listing on
proposed and ongoing activities within the range of the listed species.
The discussion below regarding protective regulations under section
4(d) of the Act complies with our policy.
II. Final Rule Issued Under Section 4(d) of the Act
Background
Section 4(d) of the Act contains two sentences. The first sentence
states that the Secretary shall issue such regulations as she deems
necessary and advisable to provide for the conservation of species
listed as threatened. The U.S. Supreme Court has noted that statutory
language like ``necessary and advisable'' demonstrates a large degree
of deference to the agency (see Webster v. Doe, 486 U.S. 592 (1988)).
Conservation is defined in the Act to mean the use of all methods and
procedures which are necessary to bring any endangered species or
threatened species to the point at which the measures provided pursuant
to the Act are no longer necessary. Additionally, the second sentence
of section 4(d) of the Act states that the Secretary may by regulation
prohibit with respect to any threatened species any act prohibited
under section 9(a)(1), in the case of fish or wildlife, or section
9(a)(2), in the case of plants. Thus, the combination of the two
sentences of section 4(d) provides the Secretary with wide latitude of
discretion to select and promulgate appropriate regulations tailored to
the specific conservation needs of the threatened species. The second
sentence grants particularly broad discretion to the Service when
adopting the prohibitions under section 9.
The courts have recognized the extent of the Secretary's discretion
under this standard to develop rules that are appropriate for the
conservation of a species. For example, courts have upheld rules
developed under section 4(d) as a valid exercise of agency authority
where they prohibited take of threatened wildlife or include a limited
taking prohibition (see Alsea Valley Alliance v. Lautenbacher, 2007
U.S. Dist. Lexis 60203 (D. Or. 2007); Washington Environmental Council
v. National Marine Fisheries Service, 2002 U.S. Dist. Lexis 5432 (W.D.
Wash. 2002)). Courts have also upheld 4(d) rules that do not address
all of the threats a species faces (see State of Louisiana v. Verity,
853 F.2d 322 (5th Cir. 1988)). As noted in the legislative history when
the Act was initially enacted, ``once an animal is on the threatened
list, the Secretary has an almost infinite number of options available
to [her] with regard to the permitted activities for those species.
[She] may, for example, permit taking, but not importation of such
species, or [s]he may choose to forbid both taking and importation but
allow the transportation of such species'' (H.R. Rep. No. 412, 93rd
Cong., 1st Sess. 1973).
Exercising its authority under section 4(d), we have developed a
rule that is designed to address the longsolid's and round hickorynut's
specific threats and conservation needs. Although the statute does not
require us to make a ``necessary and advisable'' finding with respect
to the adoption of specific prohibitions under section 9, we find that
this rule as a whole satisfies the requirement in section 4(d) of the
Act to issue regulations deemed necessary and advisable to provide for
the conservation of the longsolid and round hickorynut. As discussed
above under Summary of Biological Status and Threats, we have concluded
that the longsolid and round hickorynut are likely to become in danger
of extinction within the foreseeable future primarily due to declines
in water quality; loss of stream flow; fragmentation, alteration, and
deterioration of instream habitats; and nonnative species. These
threats, which are expected to be exacerbated by continued urbanization
and the effects of climate change, were central to our assessment of
the future viability of the longsolid and round hickorynut. The
provisions of this 4(d) rule will promote conservation of the longsolid
and round hickorynut by encouraging management of the landscape in ways
that meet both land management considerations and the conservation
needs of the longsolid and round hickorynut and are consistent with
land management considerations. The provisions of this rule are one of
many tools that we will use to promote the conservation of the
longsolid and round hickorynut.
Section 7(a)(2) of the Act requires Federal agencies, including the
Service, to ensure that any action they fund, authorize, or carry out
is not likely to jeopardize the continued existence of any endangered
species or threatened species or result in the destruction or adverse
modification of designated critical habitat of such species.
If a Federal action may affect a listed species or its critical
habitat, the responsible Federal agency (action agency) must enter into
consultation with us. Examples of actions that are subject to the
section 7 consultation process are actions on State, Tribal, local, or
private lands that require a Federal permit (such as a permit from the
U.S. Army Corps of Engineers under section 404 of the Clean Water Act
(33 U.S.C. 1251 et seq.) or a permit from the Service under section 10
of the Act) or that involve some other Federal action (such as funding
from the Federal Highway Administration, Federal Aviation
Administration, or the Federal Emergency Management Agency). Federal
actions not affecting listed species or critical habitat--and actions
on State, Tribal, local, or private lands that are not federally
funded, authorized, or carried out by a Federal agency--do not require
section 7 consultation.
This obligation does not change in any way for a threatened species
with a species-specific 4(d) rule. Actions that result in a
determination by a Federal agency of ``not likely to adversely affect''
continue to require the Service's written concurrence and actions that
are ``likely to adversely affect'' a species
[[Page 14816]]
require formal consultation and the formulation of a biological
opinion.
Provisions of the 4(d) Rule
This 4(d) rule will provide for the conservation of the longsolid
and round hickorynut by prohibiting the following activities, except as
otherwise authorized or permitted: importing or exporting; take;
possession and other acts with unlawfully taken specimens; delivering,
receiving, carrying, transporting, or shipping in interstate or foreign
commerce in the course of commercial activity; or selling or offering
for sale in interstate or foreign commerce. This protective regulation
includes most of these prohibitions because the longsolid and round
hickorynut are at risk of extinction in the foreseeable future and
putting these prohibitions in place will help to prevent further
declines, preserve the species' remaining populations, slow their rate
of decline, and decrease synergistic, negative effects from other
ongoing or future threats.
As discussed above under Summary of Biological Status and Threats,
multiple factors are affecting the status of the longsolid and round
hickorynut. A range of activities have the potential to affect these
species, including declines in water quality, loss of stream flow,
riparian and instream fragmentation, alteration and deterioration of
instream habitats, and nonnative species. These threats, which are
expected to be exacerbated by continued urbanization and the effects of
climate change, were central to our assessment of the future viability
of the longsolid and round hickorynut. Therefore, we prohibit actions
resulting in the incidental take of longsolid and round hickorynut by
altering or degrading the habitat. Regulating incidental take resulting
from these activities will help preserve the species' remaining
populations, slow their rate of decline, and decrease synergistic,
negative effects from other stressors.
Under the Act, ``take'' means to harass, harm, pursue, hunt, shoot,
wound, kill, trap, capture, or collect, or to attempt to engage in any
such conduct. Some of these provisions have been further defined in
regulation at 50 CFR 17.3. Take can result knowingly or otherwise, by
direct and indirect impacts, intentionally or incidentally. Regulating
incidental and intentional take of the longsolid and round hickorynut
will help preserve and recover remaining populations of these species,
including slowing their date of decline and decreasing negative effects
from threats. Therefore, we prohibit intentional take of longsolid and
round hickorynut, except for take resulting from those actions and
activities specifically excepted by the 4(d) rule.
The 4(d) rule provides for the conservation of the species by
allowing exceptions, including certain standard exceptions, to
incidental take prohibitions caused by actions and activities that,
while they may have some minimal level of disturbance to the longsolid
and round hickorynut, are not expected to negatively impact the
species' conservation and recovery efforts. The proposed exceptions to
these prohibitions include incidental take associated with (1)
conservation and restoration efforts by State wildlife agencies, (2)
channel restoration projects, (3) bank restoration projects, and (4)
forest management activities that implement State-approved BMPs.
The first exception is for incidental take associated with
conservation and restoration efforts for listed species conducted by
State wildlife agencies, and including, but not limited to, population
monitoring, relocation, and collection of broodstock; tissue collection
for genetic analysis; captive propagation; and subsequent stocking into
currently occupied and unoccupied areas within the historical range of
the species. We recognize our special and unique relationship with our
State natural resource agency partners in contributing to conservation
of listed species. State agencies often possess scientific data and
valuable expertise on the status and distribution of endangered,
threatened, and candidate species of wildlife and plants. State
agencies, because of their authorities and their close working
relationships with local governments and landowners, are in a unique
position to assist us in implementing all aspects of the Act. In this
regard, section 6 of the Act provides that we shall cooperate to the
maximum extent practicable with the States in carrying out programs
authorized by the Act. Therefore, in addition to the first exception
for incidental take described above, any qualified employee or agent of
a State conservation agency that is a party to a cooperative agreement
with us in accordance with section 6(c) of the Act, who is designated
by his or her agency for such purposes, and coordinates these
activities with us, would be able to conduct activities designed to
conserve the longsolid and round hickorynut that may result in
otherwise prohibited take without additional authorization.
The second exception is for incidental take resulting from channel
and bank restoration projects for creation of natural, physically
stable, ecologically functioning streams (or stream and wetland
systems) that are reconnected with their groundwater aquifers. These
projects can be accomplished using a variety of methods, but the
desired outcome is a natural channel with low shear stress (force of
water moving against the channel); bank heights that enable
reconnection to the floodplain; a reconnection of surface and
groundwater systems, resulting in perennial flows in the channel;
riffles and pools composed of existing soil, rock, and wood instead of
large imported materials; low compaction of soils within adjacent
riparian areas; and inclusion of riparian wetlands.
The third exception is for incidental take caused by bank
stabilization projects that use bioengineering methods to replace pre-
existing, bare, eroding stream banks with vegetated, stable stream
banks, thereby reducing bank erosion and instream sedimentation and
improving habitat conditions for the species. Following these
bioengineering methods, stream banks may be stabilized using native
species live stakes (live, vegetative cuttings inserted or tamped into
the ground in a manner that allows the stake to take root and grow),
native species live fascines (live branch cuttings, usually willows,
bound together into long, cigar-shaped bundles), or native species
brush layering (cuttings or branches of easily rooted tree species
layered between successive lifts of soil fill). Native species
vegetation includes woody and herbaceous species appropriate for the
region and habitat conditions. These methods will not include the sole
use of quarried rock (rip-rap) or the use of rock baskets or gabion
structures. Prior to channel restoration and bank stabilization
actions, surveys conducted in coordination with the appropriate Service
field office to determine presence of longsolid and round hickorynut
must be performed, and if located, relocation prior to project
implementation may be necessary, with post-implementation monitoring.
The fourth exception is for incidental take associated with forest
management activities that implement State-approved BMPs. Forest
landowners who properly implement these BMPs are helping conserve the
longsolid and round hickorynut, and this 4(d) rule is an incentive for
all landowners to properly implement BMPs to avoid any take
implications.
We reiterate that these actions and activities may result in some
minimal level of take of the longsolid and round hickorynut, but they
are unlikely to negatively impact the species'
[[Page 14817]]
conservation and recovery efforts. To the contrary, we expect they
would have a net beneficial effect on the species. Across the species'
range, instream habitats have been degraded physically by sedimentation
and by direct channel disturbance. The activities in the 4(d) rule are
intended to improve habitat conditions for the species in the long
term.
We may issue permits to carry out otherwise prohibited activities,
including those described above, involving threatened wildlife under
certain circumstances. Regulations governing permits are codified at 50
CFR 17.32. With regard to threatened wildlife, a permit may be issued
for the following purposes: For scientific purposes, to enhance
propagation or survival, for economic hardship, for zoological
exhibition, for educational purposes, for incidental taking, or for
special purposes consistent with the purposes of the Act. The statute
also contains certain exemptions from the prohibitions, which are found
in sections 9 and 10 of the Act.
We recognize the special and unique relationship with our State
natural resource agency partners in contributing to conservation of
listed species. State agencies often possess scientific data and
valuable expertise on the status and distribution of endangered,
threatened, and candidate species of wildlife and plants. State
agencies, because of their authorities and their close working
relationships with local governments and landowners, are in a unique
position to assist us in implementing all aspects of the Act. In this
regard, section 6 of the Act provides that we must cooperate to the
maximum extent practicable with the States in carrying out programs
authorized by the Act. Therefore, any qualified employee or agent of a
State conservation agency that is a party to a cooperative agreement
with us in accordance with section 6(c) of the Act, who is designated
by his or her agency for such purposes, will be able to conduct
activities designed to conserve the longsolid and round hickorynut that
may result in otherwise prohibited take without additional
authorization.
Nothing in this 4(d) rule will change in any way the recovery
planning provisions of section 4(f) of the Act, the consultation
requirements under section 7 of the Act, or the ability of the Service
to enter into partnerships for the management and protection of the
longsolid and round hickorynut. However, interagency cooperation may be
further streamlined through planned programmatic consultations for the
species between Federal agencies and the Service.
III. Critical Habitat for the Longsolid and Round Hickorynut
Background
Critical habitat is defined in section 3 of the Act as:
(1) The specific areas within the geographical area occupied by the
species, at the time it is listed in accordance with the Act, on which
are found those physical or biological features:
(a) Essential to the conservation of the species, and
(b) Which may require special management considerations or
protection; and
(2) Specific areas outside the geographical area occupied by the
species at the time it is listed, upon a determination that such areas
are essential for the conservation of the species.
Our regulations at 50 CFR 424.02 define the geographical area
occupied by the species as an area that may generally be delineated
around species' occurrences, as determined by the Secretary (i.e.,
range). Such areas may include those areas used throughout all or part
of the species' life cycle, even if not used on a regular basis (e.g.,
migratory corridors, seasonal habitats, and habitats used periodically,
but not solely by vagrant individuals).
Conservation, as defined under section 3 of the Act, means to use
and the use of all methods and procedures that are necessary to bring
an endangered or threatened species to the point at which the measures
provided pursuant to the Act are no longer necessary. Such methods and
procedures include, but are not limited to, all activities associated
with scientific resources management such as research, census, law
enforcement, habitat acquisition and maintenance, propagation, live
trapping, and transplantation, and, in the extraordinary case where
population pressures within a given ecosystem cannot be otherwise
relieved, may include regulated taking.
Critical habitat receives protection under section 7 of the Act
through the requirement that Federal agencies ensure, in consultation
with the Service, that any action they authorize, fund, or carry out is
not likely to result in the destruction or adverse modification of
critical habitat. The designation of critical habitat does not affect
land ownership or establish a refuge, wilderness, reserve, preserve, or
other conservation area. Such designation also does not allow the
government or public to access private lands. Such designation does not
require implementation of restoration, recovery, or enhancement
measures by non-Federal landowners. Where a landowner requests Federal
agency funding or authorization for an action that may affect a listed
species or critical habitat, the Federal agency would be required to
consult with the Service under section 7(a)(2) of the Act. However,
even if the Service were to conclude that the proposed activity would
likely result in destruction or adverse modification of the critical
habitat, the Federal action agency and the landowner are not required
to abandon the proposed activity, or to restore or recover the species;
instead, they must implement ``reasonable and prudent alternatives'' to
avoid destruction or adverse modification of critical habitat.
Under the first prong of the Act's definition of critical habitat,
areas within the geographical area occupied by the species at the time
it was listed are included in a critical habitat designation if they
contain physical or biological features (1) which are essential to the
conservation of the species and (2) which may require special
management considerations or protection. For these areas, critical
habitat designations identify, to the extent known using the best
scientific data available, those physical or biological features that
are essential to the conservation of the species (such as space, food,
cover, and protected habitat).
Under the second prong of the Act's definition of critical habitat,
we can designate critical habitat in areas outside the geographical
area occupied by the species at the time it is listed, upon a
determination that such areas are essential for the conservation of the
species.
Section 4 of the Act requires that we designate critical habitat on
the basis of the best scientific data available. Further, our Policy on
Information Standards Under the Endangered Species Act (published in
the Federal Register on July 1, 1994 (59 FR 34271)), the Information
Quality Act (section 515 of the Treasury and General Government
Appropriations Act for Fiscal Year 2001 (Pub. L. 106-554; H.R. 5658)),
and our associated Information Quality Guidelines provide criteria,
establish procedures, and provide guidance to ensure that our decisions
are based on the best scientific data available. They require our
biologists, to the extent consistent with the Act and with the use of
the best scientific data available, to use primary and original
[[Page 14818]]
sources of information as the basis for recommendations to designate
critical habitat.
When we are determining which areas should be designated as
critical habitat, our primary source of information is generally the
information from the SSA report and information developed during the
listing process for the species. Additional information sources may
include any generalized conservation strategy, criteria, or outline
that may have been developed for the species; the recovery plan for the
species; articles in peer-reviewed journals; conservation plans
developed by States and counties; scientific status surveys and
studies; biological assessments; other unpublished materials; or
experts' opinions or personal knowledge.
Habitat is dynamic, and species may move from one area to another
over time. We recognize that critical habitat designated at a
particular point in time may not include all of the habitat areas that
we may later determine are necessary for the recovery of the species.
For these reasons, a critical habitat designation does not signal that
habitat outside the designated area is unimportant or may not be needed
for recovery of the species. Areas that are important to the
conservation of the species, both inside and outside the critical
habitat designation, will continue to be subject to: (1) Conservation
actions implemented under section 7(a)(1) of the Act; (2) regulatory
protections afforded by the requirement in section 7(a)(2) of the Act
for Federal agencies to ensure their actions are not likely to
jeopardize the continued existence of any endangered or threatened
species; and (3) the prohibitions found in the section 4(d) rule.
Federally funded or permitted projects affecting listed species outside
their designated critical habitat areas may still result in jeopardy
findings in some cases. These protections and conservation tools will
continue to contribute to recovery of these species. Similarly,
critical habitat designations made on the basis of the best available
information at the time of designation will not control the direction
and substance of future recovery plans, habitat conservation plans
(HCPs), or other species conservation planning efforts if new
information available at the time of these planning efforts calls for a
different outcome.
Physical or Biological Features Essential to the Conservation of the
Species
In accordance with section 3(5)(A)(i) of the Act and regulations at
50 CFR 424.12(b), in determining which areas we will designate as
critical habitat from within the geographical area occupied by the
species at the time of listing, we consider the physical or biological
features that are essential to the conservation of the species and
which may require special management considerations or protection. The
regulations at 50 CFR 424.02 define ``physical or biological features
essential to the conservation of the species'' as the features that
occur in specific areas and that are essential to support the life-
history needs of the species, including, but not limited to, water
characteristics, soil type, geological features, sites, prey,
vegetation, symbiotic species, or other features. A feature may be a
single habitat characteristic or a more complex combination of habitat
characteristics. Features may include habitat characteristics that
support ephemeral or dynamic habitat conditions. Features may also be
expressed in terms relating to principles of conservation biology, such
as patch size, distribution distances, and connectivity. For example,
physical features essential to the conservation of the species might
include gravel of a particular size required for spawning, alkaline
soil for seed germination, protective cover for migration, or
susceptibility to flooding or fire that maintains necessary early-
successional habitat characteristics. Biological features might include
prey species, forage grasses, specific kinds or ages of trees for
roosting or nesting, symbiotic fungi, or absence of a particular level
of nonnative species consistent with conservation needs of the listed
species. The features may also be combinations of habitat
characteristics and may encompass the relationship between
characteristics or the necessary amount of a characteristic essential
to support the life history of the species.
In considering whether features are essential to the conservation
of the species, we may consider an appropriate quality, quantity, and
spatial and temporal arrangement of habitat characteristics in the
context of the life-history needs, condition, and status of the
species. These characteristics include, but are not limited to, space
for individual and population growth and for normal behavior; food,
water, air, light, minerals, or other nutritional or physiological
requirements; cover or shelter; sites for breeding, reproduction, or
rearing (or development) of offspring; and habitats that are protected
from disturbance.
As described above under Summary of Biological Status and Threats,
longsolid and round hickorynut mussels occur in river or stream
reaches. Occasional or regular interaction among individuals in
different reaches not interrupted by a barrier likely occurs, but in
general, interaction is strongly influenced by habitat fragmentation
and distance between occupied river or stream reaches. Once released
from their fish host, freshwater mussels are benthic, generally
sedentary aquatic organisms and closely associated with appropriate
habitat patches within a river or stream.
We derive the specific physical or biological features essential
for the longsolid and round hickorynut from studies of these species'
(or appropriate surrogate species') habitat, ecology, and life history.
The primary habitat elements that influence resiliency of the longsolid
and round hickorynut include water quality, water quantity, substrate,
habitat connectivity, and the presence of host fish species to ensure
recruitment. These features are also described above as resource needs
under Summary of Biological Status and Threats, and a full description
is available in the SSA reports; the individuals' needs are summarized
below in Table 1.
[[Page 14819]]
Table 1--Requirements for Each Life Stage of the Longsolid and Round Hickorynut Mussels
----------------------------------------------------------------------------------------------------------------
Resources needed to complete life stage
Life stage \1\ Source
----------------------------------------------------------------------------------------------------------------
Fertilized eggs--early spring........ Clear, flowing water Berg et al. 2008, p. 397;
Sexually mature males upstream Haag 2012, pp. 38-39.
from sexually mature females
Appropriate spawning temperatures
Glochidia--late spring to early Clear, flowing water Strayer 2008, p. 65; Haag
summer. Enough flow to keep glochidia or 2012, pp. 41-42.
conglutinates adrift and to attract drift-
feeding host fish
Presence of host fish for
attachment
Juveniles--excystment from host fish Clear, flowing water Dimock and Wright 1993, pp.
to approx. 0.8 in (~20 mm) shell Host fish dispersal 188-190; Sparks and Strayer
length. Appropriate interstitial 1998, p. 132; Augspurger et
chemistry; low salinity, low ammonia, low al. 2003, p. 2,574;
copper and other contaminants, high Augspurger et al. 2007, p.
dissolved oxygen 2,025; Strayer and Malcom
Appropriate substrate (clean 2012, pp. 1,787-1,788.
gravel/sand/cobble) for settlement
Adults--greater than 0.8 in (20 mm) Clear, flowing water Yeager et al. 1994, p. 221;
shell length. Appropriate substrate (stable Nichols and Garling 2000, p.
gravel and coarse sand free from 881; Chen et al. 2001, p.
excessive silt) 214; Spooner and Vaughn
Adequate food availability 2008, p. 308.
(phytoplankton and detritus)
High dissolved oxygen
Appropriate water temperature
----------------------------------------------------------------------------------------------------------------
\1\ These resource needs are common among North American freshwater mussels; however, due to lack of species-
specific research, parameters specific to longsolid and round hickorynut are unavailable.
Summary of Essential Physical or Biological Features
We derive the specific physical or biological features essential to
the conservation of the longsolid and round hickorynut from studies of
the species' habitat, ecology, and life history as described below.
Additional information can be found in chapter 4 of the SSA reports
(Service 2018, pp. 27-32; Service 2019, pp. 30-39), both of which are
available on https://www.regulations.gov under Docket No. FWS-R4-ES-
2020-0010. We have determined that the following physical or biological
features are essential to the conservation of the longsolid and round
hickorynut:
(1) Adequate flows, or a hydrologic flow regime (magnitude, timing,
frequency, duration, rate of change, and overall seasonality of
discharge over time), necessary to maintain benthic habitats where the
species are found and to maintain stream connectivity, specifically
providing for the exchange of nutrients and sediment for maintenance of
the mussels' and fish host's habitat and food availability, maintenance
of spawning habitat for native fishes, and the ability for newly
transformed juveniles to settle and become established in their
habitats. Adequate flows ensure delivery of oxygen, enable
reproduction, deliver food to filter-feeding mussels, and reduce
contaminants and fine sediments from interstitial spaces. Stream
velocity is not static over time, and variations may be attributed to
seasonal changes (with higher flows in winter/spring and lower flows in
summer/fall), extreme weather events (e.g., drought or floods), or
anthropogenic influence (e.g., flow regulation via impoundments).
(2) Suitable substrates and connected instream habitats,
characterized by geomorphically stable stream channels and banks (i.e.,
channels that maintain lateral dimensions, longitudinal profiles, and
sinuosity patterns over time without an aggrading or degrading bed
elevation) with habitats that support a diversity of freshwater mussel
and native fish (such as, stable riffle-run-pool habitats that provide
flow refuges consisting of predominantly silt-free, stable sand,
gravel, and cobble substrates).
(3) Water and sediment quality necessary to sustain natural
physiological processes for normal behavior, growth, and viability of
all life stages, including (but not limited to): Dissolved oxygen
(generally above 2 to 3 parts per million (ppm)), salinity (generally
below 2 to 4 ppm), and temperature (generally below 86 [deg]F ([deg]F)
(30 [deg]Celsius ([deg]C)). Additionally, water and sediment should be
low in ammonia (generally below 0.5 ppm total ammonia-nitrogen) and
heavy metal concentrations, and lack excessive total suspended solids
and other pollutants (see Threats Analysis, above).
(4) The presence and abundance of fish hosts necessary for
recruitment of the longsolid (currently unknown, likely includes
minnows of the family Cyprinidae and banded sculpin (Cottus carolinae))
and the round hickorynut (i.e., eastern sand darter (Ammocrypta
pellucida), emerald darter (Etheostoma baileyi), greenside darter (E.
blennioides), Iowa darter (E. exile), fantail darter (E. flabellare),
Cumberland darter (E. susanae), spangled darter (E. obama), variegate
darter (E. variatum), blackside darter (Percina maculata), frecklebelly
darter (P. stictogaster), and banded sculpin).
Special Management Considerations or Protection
When designating critical habitat, we assess whether the specific
areas within the geographical area occupied by the species at the time
of listing contain features which are essential to the conservation of
the species and which may require special management considerations or
protection.
The features essential to the conservation of the longsolid and
round hickorynut may require special management considerations or
protections to reduce the following threats: (1) Alteration of the
natural flow regime (modifying the natural hydrograph and seasonal
flows), including water withdrawals, resulting in flow reduction and
available water quantity; (2) urbanization of the landscape, including
(but not limited to) land conversion for urban and commercial use,
infrastructure (pipelines, roads, bridges, utilities), and urban water
uses (resource extraction activities, water supply reservoirs,
[[Page 14820]]
wastewater treatment, etc.); (3) significant alteration of water
quality and nutrient pollution from a variety of activities, such as
mining and agricultural activities; (4) impacts from invasive species;
(5) land use activities that remove large areas of forested wetlands
and riparian systems; (6) culvert and pipe installation that creates
barriers to movement for the longsolid and round hickorynut, or their
host fishes; (7) changes and shifts in seasonal precipitation patterns
as a result of climate change; and (8) other watershed and floodplain
disturbances that release sediments, pollutants, or nutrients into the
water.
Management activities that could ameliorate these threats include,
but are not limited to: Use of BMPs designed to reduce sedimentation,
erosion, and bank destruction; protection of riparian corridors and
woody vegetation; moderation of surface and ground water withdrawals to
maintain natural flow regimes; improved stormwater management; and
reduction of other watershed and floodplain disturbances that release
sediments, pollutants, or nutrients into the water.
In summary, we find that the occupied areas we are designating as
critical habitat contain the physical or biological features that are
essential to the conservation of the species and that may require
special management considerations or protection. Special management
considerations or protection may be required of the Federal action
agency to eliminate, or to reduce to negligible levels, the threats
affecting the physical and biological features of each unit.
Criteria Used To Identify Critical Habitat
As required by section 4(b)(2) of the Act, we use the best
scientific data available to designate critical habitat. In accordance
with the Act and our implementing regulations at 50 CFR 424.12(b), we
review available information pertaining to the habitat requirements of
the species and identify specific areas within the geographical area
occupied by the species at the time of listing and any specific areas
outside the geographical area occupied by the species to be considered
for designation as critical habitat. We are not designating any areas
outside the geographical area occupied by the longsolid or round
hickorynut because we have not identified any unoccupied areas that
meet the definition of critical habitat, and we have determined that
occupied areas are sufficient to conserve these two species.
Methodology Used For Selection of Units
First, we included stronghold (high) or medium condition
populations (resiliency) remaining from historical conditions. These
populations show recruitment or varied age class structure, and could
be used for recovery actions to re-establish populations within basins
through propagation activities or augment other populations through
direct translocations within their basins.
Second, we evaluated spatial representation and redundancy across
the species' ranges, to include last remaining consistently observable
population(s) in major river basins and the last remaining
population(s) in States if necessary, as States are crucial partners in
monitoring and recovery efforts.
Third, we examined the overall contribution of medium condition
populations and threats to those populations. Adjacency and
connectivity to stronghold and medium populations was considered, and
we did not include populations that have a potentially low likelihood
of recovery due to limited abundances or populations currently under a
high level of threats.
Finally, we evaluated overlap of longsolid and round hickorynut
occurrences, as well as other listed aquatic species and designated
critical habitat, to see if there are ongoing conservation and
monitoring efforts that can be capitalized on for efficiency. Rangewide
recovery considerations, such as maintaining existing genetic diversity
and striving for representation of all major portions of the species'
current ranges, were considered in formulating these critical habitat
designations. For example, in the Cumberland River basin, there is only
one remaining population of the longsolid (mainstem Cumberland River)
and only two populations remaining of the round hickorynut (Buck Creek
and Rockcastle River). In addition, in the Mississippi River basin,
only one population of the round hickorynut remains (Big Black River).
The distribution of the longsolid and round hickorynut in these basins
is substantially reduced when compared to historical data that indicate
these species were formerly much more widespread within these
drainages. Therefore, these rivers and streams were included to
maintain basin representation.
The critical habitat designation does not include all rivers and
streams currently occupied by the species, nor all rivers and streams
known to have been occupied by the species historically. Instead, it
includes only the occupied rivers and streams within the current range
that we determined have the physical or biological features that are
essential to the conservation of these species and meet the definition
of critical habitat. These rivers and streams contain populations large
and dense enough and most likely to be self-sustaining over time
(despite fluctuations in local conditions), and also have retained the
physical or biological features that will allow for the maintenance and
expansion of existing populations. These units also represent
populations that are stable and distributed over a wide geographic
area. We are not designating any areas outside the geographical area
currently occupied by either the longsolid or round hickorynut because
we determined that occupied areas are sufficient to conserve the two
species. Accordingly, we did not find any unoccupied areas to be
essential to the conservation of these species.
Sources of data for these critical habitat designations include
multiple databases maintained by universities, information from State
agencies throughout the species' ranges, and numerous survey reports on
streams throughout the species' ranges (see SSA reports (Service 2018,
entire; Service 2019, entire)). We have also reviewed available
information that pertains to the habitat requirements of these species.
Sources of information on habitat requirements include studies
conducted at occupied sites and published in peer-reviewed articles,
agency reports, and data collected during monitoring efforts (Service
2018, entire; Service 2019, entire).
In summary, for areas within the geographic area occupied by these
species at the time of listing, we delineated critical habitat unit
boundaries using a precise set of criteria. Specifically, we identified
river and stream reaches with observations from 2000 to present, given
the variable data associated with timing and frequency of mussel
surveys conducted throughout the species' ranges. We determined it is
reasonable to find these areas occupied due to the longevity of the
longsolid, the potential for incomplete survey detections for the round
hickorynut, highly variable recent survey information across both
species' ranges, and available State heritage databases and information
support for the likelihood of both species' continued presence in these
areas within this timeframe. Specific habitat areas were delineated
based on Natural
[[Page 14821]]
Heritage Element Occurrences, and unpublished survey data provided by
States, universities, and nongovernmental organizations. These areas
provide habitat for longsolid and round hickorynut populations and are
large enough to be self-sustaining over time, despite fluctuations in
local conditions. The areas within the critical habitat units represent
continuous river and stream reaches of free-flowing habitat patches
capable of sustaining host fishes and allowing for seasonal transport
of glochidia, which are essential for reproduction and dispersal of
longsolid and round hickorynut. We consider portions of the following
rivers and streams to be occupied by the species at the time of
listing, and meet the definition of critical habitat:
(1) Longsolid--French Creek, Allegheny River, Shenango River,
Middle Island Creek, Little Kanawha River, Elk River, Kanawha River,
Licking River, Green River, Cumberland River, Clinch River, and Paint
Rock River (see Final Critical Habitat Designation, below).
(2) Round hickorynut--Shenango River, Grand River, Tippecanoe
River, Middle Island Creek, Little Kanawha River, Elk River, Kanawha
River, Licking River, Rockcastle River, Buck Creek, Green River, Paint
Rock River, Duck River, and Big Black River (see Final Critical Habitat
Designation, below).
Critical Habitat Maps
When determining critical habitat boundaries, we made every effort
to avoid including developed areas such as lands covered by buildings,
pavement, and other structures because such lands lack physical or
biological features necessary for the longsolid and round hickorynut.
The scale of the maps we prepared under the parameters for publication
within the Code of Federal Regulations may not reflect the exclusion of
such developed lands. Any such lands inadvertently left inside critical
habitat boundaries shown on the maps of this rule have been excluded by
text in the rule and are not designated as critical habitat. Therefore,
a Federal action involving these lands will not trigger section 7
consultation with respect to critical habitat and the requirement of no
adverse modification unless the specific action will affect the
physical or biological features in the adjacent critical habitat.
We are designating as critical habitat stream reaches that we have
determined are occupied at the time of listing (i.e., currently
occupied) and that contain one or more of the physical or biological
features that are essential to support life-history processes of these
species. Twelve units for the longsolid and 14 units for the round
hickorynut are designated based on the presence of the physical or
biological features that support the longsolid's or round hickorynut's
life-history processes. All of the units for both species contain all
of the identified physical or biological features and support multiple
life-history processes.
The critical habitat designation is defined by the map or maps, as
modified by any accompanying regulatory text, presented at the end of
this document under Regulation Promulgation. We include more detailed
information on the boundaries of the critical habitat designation in
the preamble of this document. We will make the coordinates or plot
points or both on which each map is based available to the public on
https://www.regulations.gov at Docket No. FWS-R4-ES-2020-0010.
Final Critical Habitat Designation
We are designating a total of 1,115 river mi (1,794 km) in 12 units
as occupied critical habitat for the longsolid and a total of 921 river
mi (1,482 km) in 14 units as occupied critical habitat for the round
hickorynut. All or portions of some of these units overlap, and all 26
units are occupied by one or both species. The critical habitat areas
we describe below constitute our current best assessment of areas that
meet the definition of critical habitat for the longsolid and round
hickorynut. The 12 areas designated as critical habitat for the
longsolid are: French Creek, Allegheny River, Shenango River, Middle
Island Creek, Little Kanawha River, Elk River, Kanawha River, Licking
River, Green River, Cumberland River, Clinch River, and Paint Rock
River. The 14 areas designated as critical habitat for the round
hickorynut are: Shenango River, Grand River, Tippecanoe River, Middle
Island Creek, Little Kanawha River, Elk River, Kanawha River, Licking
River, Rockcastle River, Buck Creek, Green River, Paint Rock River,
Duck River, and Big Black River. Tables 2 and 3 show the critical
habitat units and the approximate river miles of each unit.
Table 2--Critical Habitat Units for the Longsolid. All Units Are
Occupied by the Species
[Area estimates reflect all land within critical habitat unit
boundaries]
------------------------------------------------------------------------
Adjacent riparian
Critical habitat unit (State) land ownership by Approximate river
type miles (kilometers)
------------------------------------------------------------------------
LS 1. French Creek Public (Federal, 14 (22.1)
(Pennsylvania). State);.
Private........... 106 (170.6)
Total = 120
(191.5)
LS 2. Allegheny River Public (Federal, 84 (135.8)
(Pennsylvania). State);.
Private........... 15 (24.1)
Total = 99 (159.3)
LS 3. Shenango River Public (Federal, 7 (11.3)
(Pennsylvania). State);.
Private........... 15 (24.3)
Total = 22 (35.5)
LS 4. Middle Island Creek (West Public (Local);... 0.13 (0.2)
Virginia).
Private........... 14 (23.5)
Total = 14 (23.7)
LS 5. Little Kanawha River (West Public (Federal, 0.53 (0.9)
Virginia). State);.
Private........... 122 (197.2)
Total = 123 (198)
LS 6. Elk River (West Virginia). Public (Federal, 7 (12.7)
State, Local);.
Private........... 93 (150.3)
Total = 101 (163)
LS 7. Kanawha River (West Public (Federal, 2 (4.6)
Virginia). State, Local);.
Private........... 18 (29.3)
Total = 21 (33.9)
LS 8. Licking River (Kentucky).. Public (Federal, 19 (31.7)
State, Local);.
[[Page 14822]]
Private........... 161 (259.7)
Total = 181
(291.5)
LS 9. Green River (Kentucky).... Public (Federal, 51 (82.4)
State, Local);.
Private........... 105 (169.2)
Total = 156
(251.6)
LS 10. Cumberland River Public (Federal).. Total = 48 (77.5)
(Tennessee).
LS 11. Clinch River (Virginia Public (Federal, 17 (27.3)
and Tennessee). State);.
Private........... 160 (258.8)
Total = 177
(286.1)
LS 12. Paint Rock River Public (Federal, 56 (90.4)
(Alabama). State);.
Private........... 2 (4.1)
Total = 58 (94.5)
---------------------------------------
Public...................... .................. 305 (491)
Private..................... .................. 810 (1,304)
---------------------------------------
Total................... .................. 1,115 (1,794)
------------------------------------------------------------------------
Note: River miles may not sum due to rounding.
Table 3--Critical Habitat Units for the Round Hickorynut. All Units Are
Occupied by the Species
[Area estimates reflect all land within critical habitat unit
boundaries]
------------------------------------------------------------------------
Adjacent riparian Approximate
Critical habitat unit land ownership by river miles
type (kilometers)
------------------------------------------------------------------------
RH 1. Shenango River Public (Federal, 7 (11.1)
(Pennsylvania). State);.
Private.............. 15 (24.3)
Total = 22 (35.5)
RH 2. Grand River (Ohio)...... Public (State, 33 (53)
Local);.
Private.............. 59 (95.2)
Total = 92
(148.2)
RH 3. Tippecanoe River Public (State, 9 (14.5)
(Indiana). Easement);.
Private.............. 66 (105.6)
Total = 75
(120.8)
RH 4. Middle Island Creek Public (Federal, 0.2 (0.4)
(West Virginia). State);.
Private.............. 74.8 (120.4)
Total = 75
(120.8)
RH 5. Little Kanawha River Public (Federal, 0.7 (1.2)
(West Virginia). State, Local);.
Private.............. 109 (175.4)
Total = 110
(176.6)
RH 6. Elk River (West Public (Federal, 7 (12.7)
Virginia). State, Local);.
Private.............. 93 (150.3)
Total = 101 (163)
RH 7. Kanawha River (West Public (Federal, 4 (7.2)
Virginia). State, Local);.
Private.............. 33 (53.2)
Total = 37.5
(60.4)
RH 8. Licking River (Kentucky) Public (Federal, 18 (30)
State, Local);.
Private.............. 131 (211.8)
Total = 150
(241.9)
RH 9. Rockcastle River Public (Federal);.... 15 (24.2)
(Kentucky).
Private.............. 0.3 (0.4)
Total = 15.3
(24.6)
RH 10. Buck Creek (Kentucky).. Public (State, 3 (5.5)
Local);.
Private.............. 33 (52.6)
Total = 36 (58.1)
RH 11. Green River (Kentucky). Public (Federal, 37 (59.4)
State);.
Private.............. 61 (98.4)
Total = 98
(157.7)
RH 12. Paint Rock River Public (Federal, 46 (73.4)
(Alabama). State);.
Private.............. 2 (4.1)
Total = 48 (77.5)
RH 13. Duck River (Tennessee). Public (State, 32 (51.1)
Local);.
Private.............. 27 (43.7)
Total = 59 (94.8)
RH 14. Big Black River Private.............. Total = 4 (7)
(Mississippi).
------------------
[[Page 14823]]
Public.................... ..................... 212 (341)
Private................... ..................... 709 (1,141)
------------------
Total................. ..................... 921 (1,482)
------------------------------------------------------------------------
Note: River miles may not sum due to rounding.
We present brief descriptions of all units, and reasons why they
meet the definition of critical habitat for the longsolid and round
hickorynut, below. There are a total of 12 units for the longsolid and
14 units for round hickorynut, 8 of which overlap in part or whole for
both species, and all of which contain all of the physical and
biological features essential to the conservation of both species.
Also, the majority of units overlap in part or whole with existing
critical habitat designated for other federally endangered species
(i.e., diamond darter (Crystallaria cincotta), Short's bladderpod
(Physaria globosa), purple bean (Villosa perpurpurea), rough
rabbitsfoot (Quadrula cylindrica strigillata), Cumberlandian combshell
(Epioblasma brevidens), oyster mussel (Epioblasma capsaeformis),
slabside pearlymussel (Pleuronaia (=Lexingtonia) dolabelloides), and
fluted kidneyshell (Ptychobranchus subtentus)) or federally threatened
species (i.e., rabbitsfoot (Quadrula cylindrica cylindrica), yellowfin
madtom (Noturus flavipinnis), and slender chub (Erimystax (=Hybopsis)
cahni)), as specified below.
LS 1: French Creek
Unit LS 1 consists of 120 stream mi (191.5 km) of French Creek in
Crawford, Erie, Mercer, and Venango Counties, Pennsylvania, from Union
City Dam west of Union City, Erie County, downstream to its confluence
with the Allegheny River near the City of Franklin, Venango County.
Riparian lands that border the unit include approximately 106 stream mi
(170.6 km; 76 percent) in private ownership and 14 stream mi (22.1 km;
24 percent) in public (Federal or State) ownership. General land use on
adjacent riparian lands and the surrounding HUC 8-level management unit
includes agriculture, several State-managed game lands, the communities
of Cambridge Springs and Venango, and the cities of Meadville and
Franklin. Union City Dam is operated by the U.S. Army Corps of
Engineers. Unit LS 1 is occupied by the species and contains all of the
physical or biological features essential to the conservation of the
species. The entire 120 stream mi (191.5 km) of this unit overlap with
designated critical habitat for the federally threatened rabbitsfoot
mussel (80 FR 24692; April 30, 2015).
Threats identified within this unit include the degradation of
habitat and water quality from impoundments, siltation and pollution
due to resource extraction, agriculture, timbering practices, and human
development; flow reduction and water quality degradation due to water
withdrawals and wastewater treatment plants; and the presence of
invasive, nonnative species. Special management considerations or
protection measures to reduce or alleviate the threats may include
monitoring water quality degradation within the species' range
resulting from row crop agriculture and oil and gas development, and
efforts to prevent the spread of invasive, nonnative species,
specifically the round goby (see Special Management Considerations or
Protection, above).
LS 2: Allegheny River
Unit LS 2 consists of 99 river mi (159.3 km) of the Allegheny River
in Warren, Crawford, Forest, Venango, and Clarion Counties,
Pennsylvania, from Kinzua Dam east of Warren, Warren County, downstream
to the Pennsylvania Route 58 crossing at Foxburg, Clarion County,
Pennsylvania. Riparian lands that border the unit include approximately
15 river mi (24.1 km; 14 percent) in private ownership and 84 river mi
(135.8 km; 86 percent) in public (Federal or State government)
ownership. General land use on adjacent riparian lands and the
surrounding HUC 8-level management unit includes forestry, agriculture,
and State-managed game lands. The public land ownership for this unit
is a combination of Allegheny National Forest lands and State lands,
and the Kinzua Dam is operated by the U.S. Army Corps of Engineers.
Unit LS 2 is occupied by the species and contains all of the physical
or biological features essential to the conservation of the species.
There is overlap of approximately 35 river mi (57 km) of this unit with
designated critical habitat for the federally threatened rabbitsfoot
mussel (80 FR 24692; April 30, 2015).
Threats identified within Unit LS 2 include the degradation of
habitat and water quality from impoundments, channelization, siltation
and pollution due to improper timbering practices, resource extraction,
water withdrawals, development, and wastewater treatment plants, and
the presence of invasive, nonnative species. Special management
considerations or protection measures to reduce or alleviate the
threats may include modifying dam releases from Kinzua Dam to mimic the
natural hydrograph, improvements to water quality to reverse
degradation resulting from row crop agriculture and oil and gas
development, and efforts to prevent the spread of invasive, nonnative
species (see Special Management Considerations or Protection, above).
LS 3: Shenango River
Unit LS 3 is the same as Unit RH 1, described below for the round
hickorynut. Unit LS 3 consists of 22 river mi (35.5 km) of the Shenango
River in Crawford County, Pennsylvania, from Pymatuning Dam downstream
to the point of inundation by Shenango River Lake near Big Bend, Mercer
County, Pennsylvania. Riparian lands that border the unit include
approximately 15 river mi (24.3 km; 32 percent) in private ownership
and 7 river mi (11.3 km; 68 percent) in public (Federal or State)
ownership. General land use on adjacent riparian lands and the
surrounding HUC 8-level management unit includes the City of Greenville
and its associated industry, and the unincorporated communities of
Jamestown and New Harrisburg. Pymatuning Dam is owned by the State of
Pennsylvania. Unit LS 3 is occupied by the species and contains all of
the physical or biological features essential
[[Page 14824]]
to the conservation of the species. There is overlap of approximately
14.5 river mi (23.4 km) of this unit with designated critical habitat
for the federally threatened rabbitsfoot mussel (80 FR 24692; April 30,
2015).
Threats identified within Unit LS 3 include the degradation of
habitat and water quality from impoundments, domestic and industrial
pollution due to human development, resource extraction, water
withdrawals, and wastewater treatment plants, and the presence of
invasive, nonnative species. Special management considerations or
protection measures to reduce or alleviate the threats may include
modifying dam releases from Pytmatuning Dam to mimic the natural
hydrograph, and efforts to prevent the spread of invasive, nonnative
species (see Special Management Considerations or Protection, above).
LS 4: Middle Island Creek
Unit LS 4 partially overlaps with Unit RH 4 for the round
hickorynut, described below. Unit LS 4 consists of 14 stream mi (23.7
km) of Middle Island Creek in Doddridge and Tyler Counties, West
Virginia, from the mouth of Meathouse Fork south of Smithburg,
Doddridge County, downstream to its confluence with Arnold Creek at the
Tyler/Doddridge County line. Riparian lands that border the unit
include approximately 14 stream mi (23.5 km; 99 percent) in private
ownership and 0.13 river mi (0.2 km; less than 1 percent) in public
(local government) ownership. General land use on adjacent riparian
lands and the surrounding HUC 8-level management unit includes forestry
and the communities of Smithburg, Avondale, and West Union. Unit LS 4
is occupied by the species and contains all of the physical or
biological features essential to the conservation of the species.
Threats identified within Unit LS 4 include degradation of habitat
and water quality from impoundments, siltation and pollution due to
improper timbering practices, resource extraction, water withdrawals,
development, and wastewater treatment plants, and the presence of
invasive, nonnative species. Special management considerations or
protection measures to reduce or alleviate the threats may include
actions to alleviate the threats of water quality and habitat
degradation from hydrofracking wastewater discharges and impoundments
downstream on the Ohio River, and efforts to prevent the spread of
invasive, nonnative species (see Special Management Considerations or
Protection, above).
LS 5: Little Kanawha River
Unit LS 5 partially overlaps with Unit RH 5 for the round
hickorynut, described below. Unit LS 5 consists of 123 river mi (198
km) of the Little Kanawha River in Calhoun, Gilmer, Ritchie, and Wood
Counties, West Virginia, from Burnsville Dam (which is in neighboring
Braxton County) downstream to its confluence with the Ohio River in
Parkersburg, Wood County, West Virginia. Riparian lands that border the
unit include approximately 122 river mi (197.2 km; 99 percent) in
private ownership and 0.53 river mi (0.9 km; less than 1 percent) in
public (Federal or State government) ownership. General land use on
adjacent riparian lands and the surrounding HUC 8-level management unit
includes forestry, agriculture, industry, and numerous cities and
municipalities. Burnsville Dam is operated by the U.S. Army Corps of
Engineers. Unit LS 5 is occupied by the species and contains all of the
physical or biological features essential to the conservation of the
species.
Threats identified within Unit LS 5 include the degradation of
habitat and water quality from impoundments, siltation and pollution
due to improper timbering practices, resource extraction, water
withdrawals, development, and wastewater treatments plants, and the
presence of invasive, nonnative species. Special management
considerations or protection measures to reduce or alleviate the
threats may include modifying dam releases from Burnsville Dam to mimic
the natural hydrograph, and efforts to prevent the spread of invasive,
nonnative species (see Special Management Considerations or Protection,
above).
LS 6: Elk River
Unit LS 6 is the same as Unit RH 6, described below for the round
hickorynut. Unit LS 6 consists of 101 river mi (163 km) of the Elk
River in Braxton, Clay, and Kanawha Counties, West Virginia, from
Sutton Dam in Braxton County downstream to its confluence with the
Kanawha River at Charleston, Kanawha County, West Virginia. Riparian
lands that border the unit include approximately 93 river mi (150.3 km;
92 percent) in private ownership and 7 river mi (12.7 km; 8 percent) in
public (Federal, State, and local government) ownership. General land
use on adjacent riparian lands and the surrounding HUC-8 level
management unit includes forestry, agriculture, industry, and numerous
cities and municipalities. Sutton Dam is operated by the U.S. Army
Corps of Engineers. Unit LS 6 is occupied by the species and contains
all of the physical or biological features essential to the
conservation of the species. There is overlap of approximately 28 river
mi (44.6 km) of this unit with designated critical habitat for the
federally endangered diamond darter (78 FR 52364; August 22, 2013).
Threats identified within Unit LS 6 include the degradation of
habitat and water quality from impoundments, siltation and pollution
due to improper timbering practices, resource extraction, water
withdrawals, development, and wastewater treatment plants, and the
presence of invasive, nonnative species. Special management
considerations or protection measures to reduce or alleviate the
threats may include modifying dam releases from Sutton Dam to mimic the
natural hydrograph and efforts to prevent the spread of invasive,
nonnative species (see Special Management Considerations or Protection,
above).
LS 7: Kanawha River
Unit LS 7 partially overlaps with Unit RH 7 for the round
hickorynut, described below. Unit LS 7 consists of 21 river mi (33.9
km) of the Kanawha River in Fayette and Kanawha Counties, West
Virginia, from Kanawha Falls in Fayette County downstream to its
confluence with Cabin Creek at Chelyan, Kanawha County, West Virginia.
Riparian lands that border the unit include approximately 18 river mi
(29.3 km; 90 percent) in private ownership and 2 river mi (4.6 km; 10
percent) in public (Federal, State, and local government) ownership.
General land use on adjacent riparian lands and the surrounding HUC 8-
level management unit includes forestry, agriculture, industry, and
numerous cities and municipalities. London and Marmet locks and dams
within this unit are operated by the U.S. Army Corps of Engineers. Unit
LS 7 is occupied by the species and contains all of the physical or
biological features essential to the conservation of the species.
Threats identified within Unit LS 7 include the degradation of
habitat and water quality from impoundments, siltation and pollution
due to improper timbering practices, resource extraction, water
withdrawals, development, and wastewater treatment plants, and the
presence of invasive, nonnative species. Special management
considerations or protection measures to reduce or alleviate the
threats may include riparian vegetation re-establishment in addition to
restoration efforts along shorelines to minimize sediment and
contaminant inputs, and efforts to
[[Page 14825]]
prevent the spread of invasive, nonnative species (see Special
Management Considerations or Protection, above).
LS 8: Licking River
Unit LS 8 partially overlaps with Unit RH 8 for the round
hickorynut, described below. Unit LS 8 consists of 181 river mi (291.5
km) of the Licking River in Bath, Campbell, Fleming, Harrison, Kenton,
Morgan, Nicholas, Pendleton, Robertson, and Rowan Counties, Kentucky,
from Cave Run Dam in Bath/Rowan Counties downstream to its confluence
with the Ohio River at Newport, Campbell/Kenton County, Kentucky.
Riparian lands that border the unit include approximately 161 river mi
(259.7 km; 90 percent) in private ownership and 19 river mi (31.7 km;
10 percent) in public (Federal, State, and local government) ownership.
General land use on adjacent riparian lands and the surrounding HUC 8-
level management unit includes forestry, agriculture industry, and
numerous cities and municipalities. The Cave Run Dam is operated by the
U.S. Army Corps of Engineers. Unit LS 8 is occupied by the species and
contains all of the physical or biological features essential to the
conservation of the species.
Threats identified within Unit LS 8 include the degradation of
habitat and water quality from impoundments and associated cold water
discharges, siltation and pollution due to improper timbering
practices, resource extraction, water withdrawals, development, and
wastewater treatment plants, and the presence of invasive, nonnative
species. Special management considerations or protection measures to
reduce or alleviate the threats may include modifying dam releases from
Cave Run Dam to mimic the natural hydrograph and efforts to prevent the
spread of invasive, nonnative species (see Special Management
Considerations or Protection, above).
LS 9: Green River
Unit LS 9 partially overlaps with Unit RH 11 for the round
hickorynut, described below. Unit LS 9 consists of 156 river mi (251.6
km) of the Green River in Butler/Warren, Edmonson, Green, Hart, and
Taylor Counties, Kentucky, from Green River Lake Dam south of
Campbellsville in Taylor County downstream to its confluence with the
Barren River at Woodbury, Warren/Butler County, Kentucky. Riparian
lands that border the unit include approximately 105 river mi (169.2
km; 67 percent) in private ownership and 51 river mi (82.4 km; 33
percent) in public (Federal, State, and local government) ownership;
Federal lands include a portion of Mammoth Cave National Park. General
land use on adjacent riparian lands and the surrounding HUC 8-level
management unit includes forestry, agriculture, industry, and numerous
cities and municipalities, and Green River Lake Dam is operated by the
U.S. Army Corps of Engineers. Unit LS 9 is occupied by the species and
contains all of the physical or biological features essential to the
conservation of the species. The entire approximately 156-river-mi
(252-km) unit overlaps with designated critical habitat for the
federally endangered diamond darter (78 FR 52364; August 22, 2013) and
the federally threatened rabbitsfoot mussel (80 FR 24692; April 30,
2015).
Threats identified within Unit LS 9 include the degradation of
habitat and water quality from impoundments and associated cold water
discharges, siltation and pollution due to improper timbering and
agricultural practices, resource extraction, water withdrawals, and
development, all of which affect channel stability; wastewater
treatment plants; and the presence of invasive, nonnative species.
Special management considerations or protection measures may be needed
to reduce or alleviate habitat degradation such as channelization and
channel instability. Additional special management considerations or
protection measures may be needed to address thermal and flow regimes
associated with tail water releases from the Green River Lake Dam, and
efforts to prevent the spread of invasive, nonnative species (see
Special Management Considerations or Protection, above).
LS 10: Cumberland River
Unit LS 10 consists of 48 river mi (77.5 km) of the Cumberland
River in Smith, Trousdale, and Wilson Counties, Tennessee, from Cordell
Hull Dam north of Carthage in Smith County downstream to reservoir
influence of Old Hickory Reservoir at U.S. Route 231 north of Lebanon,
Wilson County, Tennessee. Riparian lands that border the unit are all
public (Federal) ownership. General land use on adjacent riparian lands
and the surrounding HUC 8-level management unit includes forestry,
agriculture, and the municipalities of Carthage and Rome, Tennessee;
both Cordell Hull and Old Hickory Dams upstream and downstream of this
unit are operated by the U.S. Army Corps of Engineers. Unit LS 10 is
occupied by the species and contains all of the physical or biological
features essential to the conservation of the species. There is overlap
of approximately 1 river mi (1.7 km) of this unit with designated
critical habitat for the federally endangered Short's bladderpod (79 FR
50990; August 26, 2014).
Threats identified within Unit LS 10 include the degradation of
habitat and water quality from upstream and downstream impoundments and
associated cold water discharges, siltation and pollution due to
improper timbering practices, resource extraction, water withdrawals,
development, and wastewater treatment plants, and the presence of
invasive, nonnative species. Special management considerations or
protection measures to reduce or alleviate the threats may include
channel stability, thermal regimes, altered flow regimes associated
with tail water releases from Cordell Hull Reservoir, actions to
address channelization, and efforts to prevent the spread of invasive,
nonnative species (see Special Management Considerations or Protection,
above).
LS 11: Clinch River
Unit LS 11 consists of 177 river mi (286.1 km) of the Clinch River
in Russell, Scott, Tazewell, and Wise Counties in Virginia, and
Claiborne, Hancock, and Hawkins Counties in Tennessee. This unit
extends from Secondary Highway 637 west of Pounding Mill in Tazewell
County, Virginia, downstream to County Highway 25, Claiborne County,
Tennessee, northwest of Thorn Hill. The Tennessee portion of this unit
is also encompassed by the Tennessee Wildlife Resources Agency's Clinch
River Sanctuary. Riparian lands that border the unit include
approximately 160 river mi (258.8 km; 90 percent) in private ownership
and 17 river mi (27.3 km; 10 percent) in public (Federal and State)
ownership. General land use on adjacent riparian lands and the
surrounding HUC 8-level management unit includes forestry, agriculture,
industry, and numerous cities and municipalities. Unit LS 11 is
occupied by the species and contains all of the physical or biological
features essential to the conservation of the species. There is overlap
of approximately 171 river mi (274.4 km) of this unit with designated
critical habitat for the federally endangered purple bean, oyster
mussel, rough rabbitsfoot, and Cumberlandian combshell (69 FR 53136;
August 31, 2004); the federally endangered slabside pearlymussel and
fluted kidneyshell (78 FR 59556; September 26, 2013); and with the
federally threatened yellowfin madtom and slender chub (42 FR 45526;
September 9, 1977).
[[Page 14826]]
Threats identified within Unit LS 11 include the degradation of
habitat and water quality from downstream impoundment, mining
discharges, siltation and pollution due to improper timbering
practices, resource extraction, water withdrawals, development, and
wastewater treatment plants, and the presence of invasive, nonnative
species. Special management considerations or protection measures to
reduce or alleviate the threats may include management of the Norris
Reservoir downstream to provide additional riverine habitat, and
efforts to prevent the spread of invasive, nonnative species (see
Special Management Considerations or Protection, above).
LS 12: Paint Rock River
Unit LS 12 partially overlaps with Unit RH 12 for the round
hickorynut, described below. Unit LS 12 consists of 58 river mi (94.5
km) of the Paint Rock River in Jackson and Madison/Marshall Counties,
Alabama, from the confluence of Hurricane Creek and Estill Fork in
Jackson County, Alabama, downstream to its confluence with the
Tennessee River west of Hebron, Madison/Marshall County, Alabama.
Riparian lands that border the unit include approximately 2 river mi
(4.1 km; 3 percent) in private ownership and 56 river mi (90.4 km; 97
percent) in public (Federal and State) ownership. General land use on
adjacent riparian lands and the surrounding HUC 8-level management unit
includes forestry, agriculture, and several small municipalities
(Princeton, Hollytree, Trenton, and Paint Rock). Unit LS 12 is occupied
by the species and contains all of the physical or biological features
essential to the conservation of the species. There is overlap of
approximately 53 river mi (85 km) of this unit with designated critical
habitat for the federally endangered slabside pearlymussel (78 FR
59556; September 26, 2013) and the federally threatened rabbitsfoot
mussel (80 FR 24692; April 30, 2015).
Threats identified within Unit LS 12 include the degradation of
habitat and water quality from downstream impoundment, siltation and
pollution due to improper agricultural and timbering practices,
resource extraction, water withdrawals, development, and wastewater
treatment plants, and the presence of invasive, nonnative species.
Special management considerations or protection measures to reduce or
alleviate the threats may include management of Wheeler Reservoir
downstream to provide additional riverine habitat, working with
landowners to implement BMPs to reduce erosion and sedimentation
associated with agricultural lands, and efforts to prevent the spread
of invasive, nonnative species (see Special Management Considerations
or Protection, above).
RH 1: Shenango River
Unit RH 1 is the same as Unit LS 3 for the longsolid, described
above. It consists of 22 river mi (35.5 km) of the Shenango River in
Crawford County, Pennsylvania, from Pymatuning Dam downstream to the
point of inundation by Shenango River Lake near Big Bend, Mercer
County, Pennsylvania. Riparian lands that border the unit include
approximately 15 river mi (24.3 km; 32 percent) in private ownership
and 7 river mi (11.1 km; 68 percent) in public (Federal or State)
ownership. General land use on adjacent riparian lands and the
surrounding HUC 8-level management unit includes the City of Greenville
and its associated industry, and the unincorporated communities of
Jamestown and New Harrisburg. Pymatuning Dam is owned by the State of
Pennsylvania. Unit RH 1 is occupied by the species and contains all of
the physical or biological features essential to the conservation of
the species. There is overlap of approximately 14.5 river mi (23.4 km)
of this unit with designated critical habitat for the federally
threatened rabbitsfoot mussel (80 FR 24692; April 30, 2015).
Threats identified within Unit RH 1 include the degradation of
habitat and water quality from impoundments, domestic and industrial
pollution due to human development, resource extraction, water
withdrawals, and wastewater treatment plants, and the presence of
invasive, nonnative species. Special management considerations or
protection measures to reduce or alleviate the threats may include
modifying dam releases from Pytmatuning Dam to mimic the natural
hydrograph, and efforts to prevent the spread of invasive, nonnative
species (see Special Management Considerations or Protection, above).
RH 2: Grand River
Unit RH 2 consists of 92 river mi (148.2 km) of the Grand River in
Ashtabula, Lake, and Trumbull Counties, Ohio, from the Trumbull/Geauga
County line south of Lake County, Ohio State Route 88, downstream to
the mouth of the Grand River at its confluence with Lake Erie. Riparian
lands that border the unit include approximately 59 river mi (95.2 km;
64 percent) in private ownership and 33 river mi (53 km; 36 percent) in
public (State and local government) ownership. The Grand River is a
State Wild and Scenic River, with a ``Wild River'' designation for
approximately 23 river mi (37 km) from the Harpersfield Covered Bridge
downstream to the Norfolk and Western Railroad Trestle in Lake County,
and ``Scenic River'' designation for approximately 33 river mi (53 km)
from the U.S. 322 Bridge in Ashtabula County downstream to the
Harpersfield Covered Bridge. General lands use on adjacent riparian
lands and the surrounding HUC 8-level management unit includes
forestry, agriculture, and several municipalities (West Farmington,
Windsor, Rock Creek, and Perry). Harpersfield Dam is operated by the
U.S. Army Corps of Engineers. Unit RH 2 is occupied by the species and
contains all of the physical or biological features essential to the
conservation of the species.
Threats identified within Unit RH 2 include degradation of habitat
and water quality from impoundments, domestic and industrial pollution
due to human development, resource extraction, water withdrawals, and
wastewater treatment plants, and the presence of invasive, nonnative
species. Special management considerations or protection measures to
reduce or alleviate the threats may include modifying dam releases from
the Harpersfield Dam to mimic the natural hydrograph, and efforts to
prevent the spread of invasive, nonnative species (see Special
Management Considerations or Protection, above).
RH 3: Tippecanoe River
Unit RH 3 consists of 75 river mi (120.8 km) of the Tippecanoe
River in Fulton, Marshall, Pulaski, and Starke Counties, Indiana, from
the railroad crossing west of the communities of Tippecanoe, Marshall
County, downstream to the Pulaski/White County line, southwest of the
community of Star City, Indiana. Riparian lands that border the unit
include approximately 66 river mi (105.6 km; 89 percent) in private
ownership and 9 river mi (14.5 km; 11 percent) in public ownership.
General land use on adjacent riparian lands and the surrounding HUC 8-
level management unit includes agriculture and the communities of
Tippecanoe, Pershing, and Ora. Unit RH 3 is occupied by the species and
contains all of the physical or biological features essential to the
conservation of the species. There is overlap of approximately 19 river
mi (29.9 km) of this unit with designated critical habitat for the
federally threatened rabbitsfoot mussel (80 FR 24692; April 30, 2015).
Threats identified within Unit RH 3 include the degradation of
habitat and
[[Page 14827]]
water quality from impoundments, domestic and industrial pollution due
to human development, resource extraction, water withdrawals, and
wastewater treatment plants, and the presence of invasive, nonnative
species. Special management considerations or protection measures to
reduce or alleviate the threats may include modifying operations of
downstream impoundments to provide additional riverine habitats, and
efforts to prevent the spread of invasive, nonnative species (see
Special Management Considerations or Protection, above).
RH 4: Middle Island Creek
Unit RH 4 partially overlaps with Unit LS 4 for the longsolid,
described above. Unit RH 4 consists of 75 stream mi (120.8 km) of the
Middle Island Creek in Doddridge, Pleasants, and Tyler Counties, West
Virginia, from the Tyler/Doddridge County line northeast of Deep Valley
downstream to the confluence with the Ohio River, at St. Mary's,
Pleasants County, West Virginia. Riparian lands that border the unit
include approximately 74.8 stream mi (120.4 km; 99 percent) in private
ownership and 0.2 stream mi (0.4 km; less than 1 percent) in public
(Federal and State) ownership. General land use on adjacent riparian
lands and the surrounding HUC 8-level management unit includes the
communities of Smithburg, Avondale, West Union, Alma, and Centerville.
Unit RH 4 is occupied by the species and contains all of the physical
or biological features essential to the conservation of the species.
Threats identified within Unit RH 4 include the degradation of
habitat and water quality from siltation and pollution due to improper
timbering practices, resource extraction, water withdrawals,
development, and wastewater treatment plants, and the presence of
invasive, nonnative species. Special management considerations or
protection measures to reduce or alleviate the threats may include
monitoring hydrofracking wastewater discharges and impoundments
downstream on the Ohio River, and implementing efforts to prevent the
spread of invasive, nonnative species (see Special Management
Considerations or Protection, above).
RH 5: Little Kanawha River
Unit RH 5 partially overlaps with Unit LS 5 for the longsolid, also
described above. Unit RH 5 consists of 110 river mi (176.6 km) of the
Little Kanawha River in Calhoun, Gilmer, Ritchie, and Wood Counties,
West Virginia, from Burnsville Dam (which is in neighboring Braxton
County) downstream to West Virginia Route 47 at Parkersburg, Wood
County, West Virginia. Riparian lands that border the unit include
approximately 109 river mi (175.4 km; 99 percent) in private ownership
and 0.7 river mi (1.2 km; 1 percent) in public (Federal, State, and
local government) ownership. General land use on adjacent riparian
lands and the surrounding HUC 8-level management unit includes
forestry, agriculture, industry, and numerous cities and
municipalities. Burnsville Dam is operated by the U.S. Army Corps of
Engineers. Unit RH 5 is occupied by the species and contains all of the
physical or biological features essential to the conservation of the
species.
Threats identified within Unit RH 5 include the degradation of
habitat from impoundments, siltation and pollution due to improper
timbering practices, resource extraction, water withdrawals,
development, and wastewater treatment plants, and the presence of
invasive, nonnative species. Special management considerations or
protection measures to reduce or alleviate the threats may include
modifying dam releases from Burnsville Dam to mimics the natural
hydrograph, and efforts to prevent the spread of invasive, nonnative
species (see Special Management Considerations or Protection, above).
RH 6: Elk River
Unit RH 6 is the same as Unit LS 6 for the longsolid, described
above. Unit RH 6 consists of 101 river mi (163 km) of the Elk River in
Braxton, Clay, and Kanawha Counties, West Virginia, from the Sutton Dam
in Braxton County downstream to its confluence with the Kanawha River
at Charleston, Kanawha County, West Virginia. Riparian lands that
border the unit include approximately 93 river mi (150.3 km; 92
percent) in private ownership and 7 river mi (12.7 km; 8 percent) in
public (Federal, State, and local government) ownership. General land
use on adjacent riparian lands and the surrounding HUC 8-level
management unit includes forestry, agriculture, industry, and numerous
cities and municipalities. Sutton Dam is operated by the U.S. Army
Corps of Engineers. Unit RH 6 is occupied by the species and contains
all of the physical or biological features essential to the
conservation of the species. There is overlap of approximately 28 river
mi (44.6 km) of this unit with the designated critical habitat for the
federally endangered diamond darter (78 FR 52364; August 22, 2013).
Threats identified within Unit RH 6 include the degradation of
habitat and water quality from impoundments, siltation and pollution
due to improper timbering practices, resource extraction, water
withdrawals, development, and wastewater treatment plants, and the
presence of invasive, nonnative species. Special management
considerations or protection measures to reduce or alleviate the
threats may include modifying dam releases from Sutton Dam to mimic the
natural hydrograph, and efforts to prevent the spread of invasive,
nonnative species (see Special Management Considerations or Protection,
above).
RH 7: Kanawha River
Unit RH 7 partially overlaps with Unit LS 7 for the longsolid,
described above. Unit RH 7 consists of 37.5 river mi (60.4 km) of the
Kanawha River in Fayette and Kanawha Counties, West Virginia, from
Kanawha Falls in Fayette County downstream to its confluence with the
Elk River at Charleston, Kanawha County, West Virginia. Riparian lands
that border the unit include approximately 33 river mi (53.2 km; 90
percent) in private ownership and 4 river mi (7.2 km; 10 percent) in
public (Federal, State, and local government) ownership. General land
use on adjacent riparian lands and the surrounding HUC 8-level
management unit includes forestry, agriculture, industry, and numerous
cities and municipalities. London and Marmet locks and dams within this
unit are operated by the U.S. Army Corps of Engineers. Unit RH 7 is
occupied by the species and contains all of the physical or biological
features essential to the conservation of the species.
Threats identified within Unit RH 7 include the degradation of
habitat and water quality from impoundments, siltation and pollution
due to improper timbering practices, resource extraction, water
withdrawals, development, and wastewater treatment plants, and the
presence of invasive, nonnative species. Special management
considerations or protection measures to reduce or alleviate the
threats may include riparian vegetation re-establishment in addition to
restoration efforts along shorelines to minimize sediment and
contaminant inputs, and efforts to prevent the spread of invasive,
nonnative species (see Special Management Considerations or Protection,
above).
RH 8: Licking River
Unit RH 8 partially overlaps with Unit LS 8 for the longsolid,
described above. Unit RH 8 consists of 150 mi (241.9 km) of the Licking
River in Bath, Campbell, Fleming, Harrison, Kenton, Morgan,
[[Page 14828]]
Nicholas, Pendleton, Robertson, and Rowan Counties, Kentucky, from Cave
Run Dam in Bath/Rowan Counties downstream to the Railroad crossing at
the Campbell/Kenton/Pendleton County line at De Mossville, northwest of
Butler, Pendleton County, Kentucky. Riparian lands that border the unit
include approximately 131 river mi (211.8 km; 87 percent) in private
ownership and 18 river mi (30 km; 13 percent) in public (Federal,
State, and local government) ownership. General land use on adjacent
riparian lands and the surrounding HUC 8-level management unit includes
forestry, agriculture industry, and numerous cities and municipalities.
Cave Run Dam is operated by the U.S. Army Corps of Engineers. Unit RH 8
is occupied by the species and contains all of the physical or
biological features essential to the conservation of the species.
Threats identified within Unit RH 8 include the degradation of
habitat and water quality from impoundments and associated cold water
discharges, siltation and pollution due to improper timbering
practices, resource extraction, water withdrawals, development, and
wastewater treatment plants, and the presence of invasive, nonnative
species. Special management considerations or protection measures to
reduce or alleviate the threats may include modifying dam releases from
Cave Run Dam to mimic the natural hydrograph, and efforts to prevent
the spread of invasive, nonnative species (see Special Management
Considerations or Protection, above).
RH 9: Rockcastle River
Unit RH 9 consists of 15.3 river mi (24.6 km) of the Rockcastle
River in Laurel, Pulaski, and Rockcastle Counties, Kentucky, from
Kentucky Route 1956 at Billows downstream to Kentucky Route 192, near
its confluence with Cane Creek along the Laurel/Pulaski County line,
northwest of Baldrock, Laurel County, Kentucky. Riparian lands that
border the unit include approximately 0.3 river mi (0.4 km; less than 1
percent) in private ownership and 15 river mi (24.2 km; 99 percent) in
public (Federal) ownership. Federal ownership is the Daniel Boone
National Forest. General land use on adjacent riparian lands and the
surrounding HUC 8-level management unit is predominantly forestry. Unit
RH 9 is occupied by the species and contains all of the physical or
biological features essential to the conservation of the species. There
is overlap of approximately 15 river mi (23.7 km) of this unit with
designated critical habitat for the federally endangered fluted
kidneyshell (78 FR 59556; September 26, 2013).
Threats identified within Unit RH 9 include the degradation of
habitat and water quality from siltation and pollution due to improper
timbering practices and resource extraction, and the presence of
invasive, nonnative species. Special management considerations or
protection measures to reduce or alleviate the threats may include
management of Lake Cumberland, located downstream, to provide more
riverine habitat upstream, and efforts to prevent the spread of
invasive, nonnative species (see Special Management Considerations or
Protection, above).
RH 10: Buck Creek
Unit RH 10 consists of 36 stream mi (58.1 km) of Buck Creek in
Pulaski County, Kentucky, from its confluence with Glade Fork Creek
northeast of Goochtown, downstream to its confluence with Whetstone
Creek, northeast of Dykes, Pulaski County, Kentucky. Riparian lands
that border the unit include approximately 33 stream mi (52.6 km; 92
percent) in private ownership and 3 stream mi (5.5 km; 8 percent) in
public (State and local government) ownership. General land use on
adjacent riparian lands and the surrounding HUC 8-level management unit
includes forestry, agriculture, and several small communities. Unit RH
10 is occupied by the species and contains all of the physical or
biological features essential to the conservation of the species. There
is overlap of approximately 35 stream mi (56.7 km) with designated
critical habitat for the federally endangered Cumberlandian combshell
and oyster mussel (69 FR 53136; August 31, 2004), and the federally
endangered fluted kidneyshell (78 FR 59556; September 26, 2013).
Threats identified within Unit RH 10 include the degradation of
habitat and water quality from instream gravel mining, forest clearing
activities, illegal off-road vehicle use, nonpoint source pollution
from agriculture, and development activities, and the presence of
invasive, nonnative species. Special management considerations or
protection measures to reduce or alleviate the threats may include
management of Lake Cumberland, located downstream, to provide more
riverine habitat upstream, and efforts to prevent the spread of
invasive, nonnative species (see Special Management Considerations or
Protection, above).
RH 11: Green River
Unit RH 11 partially overlaps with Unit LS 9 for the longsolid,
described above. Unit RH 11 consists of 98 river mi (157.7 km) of the
Green River in Butler/Warren, Edmonson, Green, and Hart Counties,
Kentucky, from the mouth of Lynn Camp Creek east of Linwood in Hart
County downstream to its confluence with the Barren River at Woodbury,
Warren/Butler Counties, Kentucky. Riparian lands that border the unit
include approximately 61 river mi (98.4 km; 62 percent) in private
ownership and 37 river mi (59.4 km; 38 percent) in public (Federal and
State) ownership; Federal lands include a portion of Mammoth Cave
National Park. General land use on adjacent riparian lands and the
surrounding HUC 8-level management unit includes forestry, agriculture,
industry, and numerous cities and municipalities, and Green River Lake
Dam (located upstream of this unit) is operated by the U.S. Army Corps
of Engineers. Unit RH 11 is occupied by the species and contains all of
the physical or biological features essential to the conservation of
the species. The entire 98-river-mi (157.7-km) unit overlaps with
designated critical habitat for the federally endangered diamond darter
(78 FR 52364; August 22, 2013) and the federally threatened rabbitsfoot
mussel (80 FR 24692; April 30, 2015).
Threats identified within Unit RH 11 include the degradation of
habitat and water quality from Green River Lake Dam and associated cold
water discharges, siltation and pollution due to improper timbering and
agricultural practices, resource extraction, water withdrawals, and
development, all of which affect channel stability; wastewater
treatment plants; and the presence of invasive, nonnative species.
Special management considerations or protection measures may be needed
to reduce or alleviate habitat degradation such as channelization and
channel instability. Additional special management considerations or
protection measures may be needed to address thermal and flow regimes
associated with tail water releases from the Green River Lake Dam, and
efforts to prevent the spread of invasive, nonnative species (see
Special Management Considerations or Protection, above).
RH 12: Paint Rock River
Unit RH 12 partially overlaps with Unit LS 12 for the longsolid,
described above. Unit RH 12 consists of 48 river mi (77.5 km) of the
Paint Rock River in Jackson and Madison/Marshall
[[Page 14829]]
Counties, Alabama, from the confluence of Hurricane Creek and Estill
Fork in Jackson County, Alabama, downstream to U.S. Route 431, south of
New Hope, Madison/Marshall Counties, Alabama. Riparian lands that
border the unit include approximately 2 river mi (4.1 km; 2 percent) in
private ownership and 46 river mi (73.4 km; 98 percent) in public
(Federal and State) ownership. General land use on adjacent riparian
lands and the surrounding HUC 8-level management unit includes
forestry, agriculture, and several small municipalities (Princeton,
Hollytree, Trenton, and Paint Rock). Unit RH 12 is occupied by the
species and contains all of the physical or biological features
essential to the conservation of the species. The entire approximately
48-river-mi (77.5-km) unit overlaps with designated critical habitat
for the federally endangered slabside pearlymussel (78 FR 59556;
September 26, 2013), and the federally threatened rabbitsfoot mussel
(80 FR 24692; April 30, 2015).
Threats identified within Unit RH 12 include the degradation of
habitat and water quality from impoundments, siltation and pollution
due to improper timbering practices, resource extraction, water
withdrawals, development, and wastewater treatment plants, and the
presence of invasive, nonnative species. Special management
considerations or protection measures to reduce or alleviate the
threats may include management of Wheeler Reservoir downstream to
provide additional riverine habitat, working with landowners to
implement BMPs to reduce erosion and sedimentation associated with
agricultural lands, and efforts to prevent the spread of invasive,
nonnative species (see Special Management Considerations or Protection,
above).
RH 13: Duck River
Unit RH 13 consists of 59 river mi (94.8 km) of the Duck River in
Bedford, Marshall, and Maury Counties, Tennessee, from its confluence
with Sinking Creek in Bedford County, downstream to the mouth of Goose
Creek, east of Columbia, Maury County, Tennessee. Riparian lands that
border the unit include approximately 27 river mi (43.7 km; 47 percent)
in private ownership and 32 river mi (51.1 km; 53 percent) in public
(State and local government) ownership. General land use on adjacent
riparian lands and the surrounding HUC 8-level management unit includes
forestry, agriculture, and several municipalities (Milltown, Leftwich,
and Philadelphia). Normandy Dam is operated by the Tennessee Valley
Authority. Unit RH 13 is occupied by the species and contains all of
the physical or biological features essential to the conservation of
the species. There is overlap of approximately 55 river mi (88.9 km) of
this unit with designated critical habitat for the federally endangered
slabside pearlymussel and fluted kidneyshell (78 FR 59556; September
26, 2013), and the federally endangered Cumberlandian combshell and
oyster mussel (69 FR 53136; August 31, 2004).
Threats identified within Unit RH 13 include the degradation of
habitat and water quality from impoundments, siltation and pollution
due to improper timbering practices, agricultural activities
(livestock), row crop agriculture and channelization, resource
extraction, water withdrawals, and wastewater treatment plants, and the
presence of invasive, nonnative species. Special management
considerations or protection measures to reduce or alleviate the
threats may include seasonally adjusted flow regimes associated with
tail water releases from Normandy Dam, working with landowners to
implement BMPs to reduce erosion and sedimentation associated with
agricultural lands, planting adequate riparian buffers to minimize
agriculture impacts, and implementing efforts to prevent the spread of
invasive, nonnative species (see Special Management Considerations or
Protection, above).
RH 14: Big Black River
Unit RH 14 consists of 4 river mi (7 km) of the Big Black River in
Montgomery County, Mississippi, from its confluence with Poplar Creek
in Montgomery County, downstream to its confluence with Lewis Creek,
Mississippi. Riparian lands that border the unit are all (100 percent)
in private ownership. General land use on adjacent riparian lands and
the surrounding HUC 8-level management unit is predominantly
agricultural activities. Unit RH 14 is occupied by the species and
contains all of the physical or biological features essential to the
conservation of the species.
Threats identified within Unit RH 14 include degradation of habitat
and water quality from impoundments, siltation and pollution due to
improper agricultural activities, row crop agriculture and
channelization, and water withdrawals, and the presence of invasive,
nonnative species. Special management considerations or protection
measures to reduce or alleviate the threats may include working with
landowners to implement BMPs to reduce erosion and sedimentation
associated with agricultural lands and water quality degradation, and
efforts to prevent the spread of invasive, nonnative species (see
Special Management Considerations or Protection, above).
Effects of Critical Habitat Designation
Section 7 Consultation
Section 7(a)(2) of the Act requires Federal agencies, including the
Service, to ensure that any action they fund, authorize, or carry out
is not likely to jeopardize the continued existence of any endangered
species or threatened species or result in the destruction or adverse
modification of designated critical habitat of such species.
We published a final rule revising the definition of destruction or
adverse modification on August 27, 2019 (84 FR 44976). Destruction or
adverse modification means a direct or indirect alteration that
appreciably diminishes the value of critical habitat as a whole for the
conservation of a listed species.
If a Federal action may affect a listed species or its critical
habitat, the responsible Federal agency (action agency) must enter into
consultation with us. Examples of actions that are subject to the
section 7 consultation process are actions on State, Tribal, local, or
private lands that require a Federal permit (such as a permit from the
U.S. Army Corps of Engineers under section 404 of the Clean Water Act
(33 U.S.C. 1251 et seq.) or a permit from the Service under section 10
of the Act) or that involve some other Federal action (such as funding
from the Federal Highway Administration, Federal Aviation
Administration, or the Federal Emergency Management Agency). Federal
actions not affecting listed species or critical habitat, and actions
on State, Tribal, local, or private lands that are not federally
funded, authorized, or carried out by a Federal agency--do not require
section 7 consultation.
Compliance with the requirements of section 7(a)(2) is documented
through our issuance of:
(1) A concurrence letter for Federal actions that may affect, but
are not likely to adversely affect, listed species or critical habitat;
or
(2) A biological opinion for Federal actions that may affect, and
are likely to adversely affect, listed species or critical habitat.
When we issue a biological opinion concluding that a project is
likely to jeopardize the continued existence of a listed species and/or
destroy or adversely modify critical habitat, we provide reasonable and
prudent
[[Page 14830]]
alternatives to the project, if any are identifiable, that would avoid
the likelihood of jeopardy and/or destruction or adverse modification
of critical habitat. We define ``reasonable and prudent alternatives''
(at 50 CFR 402.02) as alternative actions identified during
consultation that:
(1) Can be implemented in a manner consistent with the intended
purpose of the action,
(2) Can be implemented consistent with the scope of the Federal
agency's legal authority and jurisdiction,
(3) Are economically and technologically feasible, and
(4) Would, in the Service Director's opinion, avoid the likelihood
of jeopardizing the continued existence of the listed species and/or
avoid the likelihood of destroying or adversely modifying critical
habitat.
Reasonable and prudent alternatives can vary from slight project
modifications to extensive redesign or relocation of the project. Costs
associated with implementing a reasonable and prudent alternative are
similarly variable.
Regulations at 50 CFR 402.16 set forth requirements for Federal
agencies to reinitiate formal consultation on previously reviewed
actions. These requirements apply when the Federal agency has retained
discretionary involvement or control over the action (or the agency's
discretionary involvement or control is authorized by law) and,
subsequent to the previous consultation: (1) if the amount or extent of
taking specified in the incidental take statement is exceeded; (2) if
new information reveals effects of the action that may affect listed
species or critical habitat in a manner or to an extent not previously
considered; (3) if the identified action is subsequently modified in a
manner that causes an effect to the listed species or critical habitat
that was not considered in the biological opinion or written
concurrence; or (4) if a new species is listed or critical habitat
designated that may be affected by the identified action.
In such situations, Federal agencies sometimes may need to request
reinitiation of consultation with us, but Congress also enacted some
exceptions in 2018 to the requirement to reinitiate consultation on
certain land management plans on the basis of a new species listing or
new designation of critical habitat that may be affected by the subject
Federal action. See 2018 Consolidated Appropriations Act, Public Law
115-141, Div, O, 132 Stat. 1059 (2018).
Overall, and as stated above under Final Critical Habitat
Designation, the majority of units overlap in part or whole with
existing critical habitat designated for other federally endangered
aquatic species (i.e., diamond darter, Short's bladderpod, purple bean,
rough rabbitsfoot, Cumberlandian combshell, oyster mussel, slabside
pearlymussel, and fluted kidneyshell) or federally threatened aquatic
species (i.e., rabbitsfoot, yellowfin madtom, and slender chub). The
conservation measures we would recommend for the longsolid and round
hickorynut are likely to be the same or very similar to those we
already recommend for these other listed aquatic species.
Application of the ``Adverse Modification'' Standard
The key factor related to the destruction or adverse modification
determination is whether implementation of the proposed Federal action
directly or indirectly alters the designated critical habitat in a way
that appreciably diminishes the value of the critical habitat as a
whole for the conservation of the listed species. As discussed above,
the role of critical habitat is to support physical or biological
features essential to the conservation of a listed species and provide
for the conservation of the species.
Section 4(b)(8) of the Act requires us to briefly evaluate and
describe, in any proposed or final regulation that designates critical
habitat, activities involving a Federal action that may violate section
7(a)(2) of the Act by destroying or adversely modifying such habitat,
or that may be affected by such designation.
Activities that we may, during a consultation under section 7(a)(2)
of the Act, consider likely to destroy or adversely modify critical
habitat include, but are not limited to actions that would: (1) Alter
the geomorphology of their stream and river habitats (e.g., instream
excavation or dredging, impoundment, channelization, sand and gravel
mining, clearing riparian vegetation, and discharge of fill materials);
(2) significantly alter the existing flow regime where these species
occur (e.g., impoundment, urban development, water diversion, water
withdrawal, water draw-down, and hydropower generation); (3)
significantly alter water chemistry or water quality (e.g., hydropower
discharges, or the release of chemicals, biological pollutants, or
heated effluents into surface water or connected groundwater at a point
source or by dispersed release (nonpoint source)); and (4)
significantly alter stream bed material composition and quality by
increasing sediment deposition or filamentous algal growth (e.g.,
construction projects, gravel and sand mining, oil and gas development,
coal mining, livestock grazing, timber harvest, and other watershed and
floodplain disturbances that release sediments or nutrients into the
water). Consulting agencies and such activities could include, but are
not limited to:
(1) U.S. Army Corps of Engineers (channel dredging and maintenance;
dam projects including flood control, navigation, hydropower, and water
supply; and Clean Water Act permitting including bridge projects and
stream restoration activities).
(2) U.S. Department of Agriculture, including the Natural Resources
Conservation Service and Farm Service Agency (technical and financial
assistance for projects) and the Forest Service (aquatic habitat
restoration, fire management plans, fire suppression, fuel reduction
treatments, forest plans, and mining permits).
(3) U.S. Department of Energy (renewable and alternative energy
projects).
(4) Federal Energy Regulatory Commission (interstate pipeline
construction and maintenance, dam relicensing, and hydrokinetics).
(5) U.S. Department of Transportation (highway and bridge
construction and maintenance).
(6) U.S. Fish and Wildlife Service (issuance of section 10 permits
for enhancement of survival, habitat conservation plans, and safe
harbor agreements; Partners for Fish and Wildlife program projects
benefiting these species or other listed species; and Wildlife and
Sportfish Restoration program sportfish stocking).
(7) Environmental Protection Agency (water quality criteria and
permitting).
(8) Tennessee Valley Authority (flood control, navigation,
hydropower, and land management for the Tennessee River system).
(9) Office of Surface Mining Reclamation and Enforcement (land
resource management plans, mining permits, oil and natural gas permits,
abandoned mine land projects, and renewable energy development).
(10) National Park Service (land management plans and permitting).
Exemptions
Application of Section 4(a)(3) of the Act
Section 4(a)(3)(B)(i) of the Act (16 U.S.C. 1533(a)(3)(B)(i))
provides that the Secretary shall not designate as critical habitat any
lands or other geographical areas owned or controlled by the
[[Page 14831]]
Department of Defense (DoD), or designated for its use, that are
subject to an integrated natural resources management plan (INRMP)
prepared under section 101 of the Sikes Act Improvement Act of 1997 (16
U.S.C. 670a), if the Secretary determines in writing that such plan
provides a benefit to the species for which critical habitat is
proposed for designation. There are no DoD lands with a completed INRMP
within the critical habitat designation.
Consideration of Impacts Under Section 4(b)(2) of the Act
Section 4(b)(2) of the Act states that the Secretary shall
designate and make revisions to critical habitat on the basis of the
best available scientific data after taking into consideration the
economic impact, national security impact, and any other relevant
impact of specifying any particular area as critical habitat. The
Secretary may exclude an area from critical habitat based on economic
impacts, impacts on national security, or any other relevant impacts.
Exclusion decisions are governed by the regulations at 50 CFR 424.19
and the Policy Regarding Implementation of Section 4(b)(2) of the
Endangered Species Act, 81 FR 7226 (Feb. 11, 2016) (2016 Policy)--both
of which were developed jointly with the National Marine Fisheries
Service (NMFS). We also refer to a 2008 Department of the Interior
Solicitor's opinion entitled ``The Secretary's Authority to Exclude
Areas from a Critical Habitat Designation under Section 4(b)(2) of the
Endangered Species Act'' (M-37016). We explain each decision to exclude
areas, as well as decisions not to exclude, to demonstrate that the
decision is reasonable.
The Secretary may exclude any particular area if she determines
that the benefits of such exclusion outweigh the benefits of including
such area as part of the critical habitat, unless she determines, based
on the best scientific data available, that the failure to designate
such area as critical habitat will result in the extinction of the
species. In making the determination to exclude a particular area, the
statute on its face, as well as the legislative history, are clear that
the Secretary has broad discretion regarding which factor(s) to use and
how much weight to give to any factor. In this final rule, we are not
excluding any areas from critical habitat.
Exclusions Based on Economic Impacts
Section 4(b)(2) of the Act and its implementing regulations require
that we consider the economic impact that may result from a designation
of critical habitat. In order to consider economic impacts, we prepared
an incremental effects memorandum (IEM) and screening analysis which,
together with our narrative and interpretation of effects, we consider
our economic analysis of the critical habitat designation and related
factors (Service 2020, entire). The analysis, dated March 19, 2020, was
made available for public review from September 29, 2020, through
December 28, 2020 (Industrial Economics, Inc. 2020, entire). The
economic analysis addressed probable economic impacts of critical
habitat designation for the longsolid and round hickorynut. Following
the close of the comment period, we reviewed and evaluated all
information submitted during the comment period that may pertain to our
consideration of the probable incremental economic impacts of this
critical habitat designation. Additional information relevant to the
probable incremental economic impacts of critical habitat designation
for the longsolid and round hickorynut is summarized below and
available in the screening analysis for the longsolid and round
hickorynut (Industrial Economics, Inc. 2020, entire), available at
https://www.regulations.gov.
Executive Orders (E.O.s) 12866 and 13563 direct Federal agencies to
assess the costs and benefits of available regulatory alternatives in
quantitative (to the extent feasible) and qualitative terms. Consistent
with the E.O. regulatory analysis requirements, our effects analysis
under the Act may take into consideration impacts to both directly and
indirectly affected entities, where practicable and reasonable. If
sufficient data are available, we assess, to the extent practicable,
the probable impacts to both directly and indirectly affected entities.
As part of our screening analysis, we considered the types of economic
activities that are likely to occur within the areas likely affected by
the critical habitat designation. In our evaluation of the probable
incremental economic impacts that may result from the designation of
critical habitat for the longsolid and round hickorynut, first we
identified, in the IEM dated February 13, 2020 (Service 2020, entire),
probable incremental economic impacts associated with the following
categories of activities: instream excavation or dredging;
impoundments; channelization; sand and gravel mining; clearing riparian
vegetation; discharge of fill materials; urban development; water
diversion; water withdrawal; water draw-down; hydropower generation and
discharges; release of chemicals, biological pollutants, or heated
effluents into surface water or connected ground water at a point
source or by dispersed release (nonpoint); construction projects; oil
and gas development; coal mining; livestock grazing; timber harvest;
and other watershed or floodplain activities that release sediments or
nutrients into the water. We considered each industry or category
individually. Additionally, we considered whether their activities have
any Federal involvement.
Critical habitat designation generally will not affect activities
that do not have any Federal involvement; under the Act, the
designation of critical habitat only affects activities conducted,
funded, permitted, or authorized by Federal agencies. In areas where
the longsolid or round hickorynut are present, Federal agencies are
required to consult with the Service under section 7 of the Act on
activities they fund, permit, or implement that may affect the species.
Consultations to avoid the destruction or adverse modification of
critical habitat will be incorporated into the existing consultation
process.
In our IEM, we attempted to clarify the distinction between the
effects that would result from the species being listed and those
attributable to the critical habitat designation (i.e., difference
between the jeopardy and adverse modification standards) for the
longsolid's and round hickorynut's critical habitat. Because we are
designating critical habitat for the longsolid and round hickorynut
concurrently with listing the species, it has been our experience that
it is more difficult to discern which conservation efforts are
attributable to the species' being listed and those which will result
solely from the designation of critical habitat; this is particularly
difficult where there is no unoccupied critical habitat and, thus,
there will be consultations for all areas based on the species'
presence in those areas. However, the following specific circumstances
in this case help to inform our evaluation: (1) The essential physical
or biological features identified for critical habitat are the same
features essential for the life requisites of the species, and (2) any
actions that would result in sufficient harm or harassment to
constitute jeopardy to the longsolid or round hickorynut would also
likely adversely affect the essential physical or biological features
of critical habitat. The IEM outlines our rationale concerning this
limited distinction between baseline conservation efforts and
incremental impacts of the designation of critical habitat for this
species. This evaluation of the
[[Page 14832]]
incremental effects has been used as the basis to evaluate the probable
incremental economic impacts of this designation of critical habitat.
The final critical habitat designation for the longsolid includes
12 units, all of which are occupied by the species. Ownership of
riparian lands adjacent to the units includes 810 river mi (1,304 km;
74 percent) in private ownership and 305 river mi (491 km; 26 percent)
in public (Federal, State, or local government) ownership. The final
critical habitat designation for the round hickorynut includes 14
units, all of which are occupied by the species. Ownership of riparian
lands adjacent to the units includes 709 river mi (1,141 km; 77
percent) in private ownership and 212 river mi (341 km; 23 percent) in
public (Federal, State, or local government) ownership.
Total incremental costs of critical habitat designation for the
longsolid and round hickorynut are anticipated to be approximately
$327,000 (2020 dollars) per year for the next 10 years. The costs are
reflective of the critical habitat area (i.e., 1,115 river mi (1,794
km) for the longsolid and 921 river mi (1,482 km) for the round
hickorynut (some of which overlap each other)), the presence of the
species (i.e., occupied) in these areas, and the presence of other
federally listed species and designated critical habitats. Since
consultation is already required in these areas as a result of the
presence of other listed species and critical habitats and will be
required as a result of the listing of the longsolid and round
hickorynut, the economic costs of the critical habitat designation will
likely be primarily limited to additional administrative efforts to
consider adverse modification for these two species in section 7
consultations. In total, 159 section 7 consultation actions
(approximately 3 formal consultations, 114 informal consultations, and
38 technical assistance efforts) are anticipated to occur annually in
designated critical habitat areas. Critical habitat may also trigger
additional regulatory changes. For example, the designation may cause
other Federal, State, or local permitting or regulatory agencies to
expand or change standards or requirements. Regulatory uncertainty
generated by critical habitat may also have impacts. For example,
landowners or buyers may perceive that the rule restricts land or water
use activities in some way and, therefore, value the use of the land
less than they would have absent critical habitat.
We solicited data and comments from the public regarding the
economic analysis, as well as all aspects of the September 29, 2020 (85
FR 61384), proposed rule. We did not receive any additional information
on economic impacts during the public comment period to determine
whether any specific areas should be excluded from the final critical
habitat designation under authority of the Act's section 4(b)(2) and
our implementing regulations at 50 CFR 424.19.
As discussed above, we considered the economic impacts of the
critical habitat designation, the Secretary is not exercising her
discretion to exclude any areas from this designation of critical
habitat for the longsolid and round hickorynut based on economic
impacts.
A copy of the IEM and screening analysis with supporting documents
may be obtained by contacting the Asheville Ecological Services Field
Office (see FOR FURTHER INFORMATION CONTACT) or by downloading from the
internet at https://www.regulations.gov.
Exclusions Based on Impacts on National Security and Homeland Security
In preparing this rule, we determined that there are no lands
within the designated critical habitat for the longsolid or round
hickorynut that are owned or managed by the DoD or Department of
Homeland Security, and, therefore, we anticipate no impact on national
security or homeland security. We did not receive any additional
information during the public comment period for the proposed
designation regarding impacts of the designation on national security
or homeland security that would support excluding any specific areas
from the final critical habitat designation under authority of section
4(b)(2) and our implementing regulations at 50 CFR 424.19, as well as
the 2016 Policy.
Exclusions Based on Other Relevant Impacts
Under section 4(b)(2) of the Act, we consider any other relevant
impacts, in addition to economic impacts and impacts on national
security as discussed above. To identify other relevant impacts that
may affect the exclusion analysis, we consider a number of factors,
including whether there are permitted conservation plans covering the
species in the area such as HCPs, safe harbor agreements, or candidate
conservation agreements with assurances, or whether there are non-
permitted conservation agreements and partnerships that would be
encouraged by designation of, or exclusion from, critical habitat. In
addition, we look at whether Tribal conservation plans or partnerships,
Tribal resources, or government-to-government relationships of the
United States with Tribal entities may be affected by the designation.
We also consider any State, local, social, or other impacts that might
occur because of the designation.
We are not excluding any areas from critical habitat. In preparing
this final rule, we have determined that there are currently no HCPs or
other management plans for the longsolid and round hickorynut, and the
designation does not include any Tribal lands or trust resources. We
anticipate no impact on Tribal lands, partnerships, or HCPs from this
final critical habitat designation. We did not receive any additional
information during the public comment period for the proposed rule
regarding other relevant impacts to support excluding any specific
areas from the final critical habitat designation under authority of
section 4(b)(2) and our implementing regulations at 50 CFR 424.19, as
well as the 2016 Policy. Accordingly, the Secretary is not exercising
her discretion to exclude any areas from this designation based on
other relevant impacts.
Summary of Comments and Recommendations
In the proposed rule published on September 29, 2020 (85 FR 61384),
we requested that all interested parties submit written comments on the
proposal by December 28, 2020. We also contacted appropriate Federal
and State agencies, scientific experts and organizations, and other
interested parties and invited them to comment on the proposal.
Newspaper notices inviting general public comment were published in the
USA Today legal notice section on September 30, 2020. Although we
invited requests for a public hearing in the proposed rule, we did not
receive any requests for a public hearing. All substantive information
received during the comment period has either been incorporated
directly into this final determination or is addressed below.
Peer Reviewer Comments
As discussed in Peer Review above, we received comments from three
specialists for the longsolid (which informed the SSA report and this
final rule), and no responses for the round hickorynut. We reviewed all
comments we received from the peer reviewers for substantive issues and
new information regarding the information contained in the longsolid's
SSA report. The peer reviewers generally concurred with our methods and
conclusions, and provided additional information, clarifications, and
suggestions to improve the final
[[Page 14833]]
SSA report. Peer reviewer comments were incorporated into the SSA
report and this final rule as appropriate.
State Agency Comments
We received comments from agencies in six States: Michigan, Ohio,
Pennsylvania, West Virginia, North Carolina, and Mississippi.
(1) Comment: The Michigan Department of Natural Resources (DNR)
requested that we not list the longsolid as an endangered species in
the State of Michigan, and that we postpone listing the round
hickorynut as an endangered species until additional information
concerning their distribution and status is available. Additionally,
the Michigan DNR requested we partner with them to conduct additional
surveys in Michigan to evaluate the current population status of the
round hickorynut due to information gaps for this species in Michigan.
Our Response: The longsolid does not occur in Michigan, nor are
there any historical records for the State; therefore, we did not
propose to list, and are not listing in this rule, the longsolid within
the State of Michigan. We agree that there is limited information
available for round hickorynut in Michigan; however, we must make a
decision based the best available scientific and commercial
information. Accordingly, our analysis of the best available data
indicates that the species meets the definition of a threatened species
under the Act (see Determination of Status for the Longsolid and Round
Hickorynut, above). We support the State conducting additional surveys
due to its status as a ``State trust species,'' and we will continue to
coordinate with Michigan DNR to ensure that the best available
information is also used for any future conservation actions.
(2) Comment: The State of West Virginia recommended that the
Kanawha River be included in the discussion of transportation threats
regarding barge traffic given it is navigable and subject to barge
traffic activity.
Our Response: The Kanawha River is incorporated by reference (i.e.,
the listed populations in this section of the proposed rule include
Taylor (1983b, p. 5)), which is a mussel survey of the Kanawha River.
Our intent was that the threat discussion of transportation include all
major river basins (HUC 2 level), which includes the Kanawha River,
where the longsolid is extant.
(3) Comment: The State of West Virginia recommended that Unit RH 4
(Middle Island Creek) include Meathouse Fork, which is a major
tributary of Middle Island Creek. The State indicated that West
Virginia DNR surveys have found greater numbers of round hickorynut in
Meathouse Fork than in the whole of the Elk River.
Our Response: Meathouse Fork, although occupied by the round
hickorynut, was not proposed as critical habitat and is not designated
as critical habitat in this rule. We have determined that the ``core''
population in Middle Island Creek is sufficient to maintain resiliency
in the watershed, as it is considered a stronghold population (which
was part of the criteria for critical habitat selection). At this time,
the Meathouse Fork population exhibits low resiliency and is subject to
a high level of threats, such as contaminant spills, as discussed under
Threats Analysis, above. We determined it does not contain the physical
or biological features essential for the conservation of the species
and, therefore, does not meet the definition of critical habitat.
(4) Comment: The State of Ohio stated that listing these species
will increase their costs for complying with the Act and the National
Environmental Policy Act (NEPA; 42 U.S.C. 4321 et seq.), mainly through
increased species surveys, the costs associated with formal
consultations (the production of biological assessments), and possible
costs associated with project delays due to the length of time to
conduct formal consultation versus informal consultation. The State
indicated that due to listing the round hickorynut, it will be
necessary to conduct two additional survey efforts and two possible
formal consultations per year on average. The State asserts these
formal consultations will add approximately $100,000-$200,000 per year
in project costs, potentially increasing the State's compliance costs
by 4 percent per year.
Our Response: The Act requires the Secretary to base listing
determinations solely on the best scientific and commercial data
available; thus, we cannot factor in possible economic costs into a
decision to list a species. However, we acknowledge that listing either
species could result in additional costs to the State to comply with
the Act, and potentially other laws, given the protections that are
afforded listed species. Separately, we are required to consider
economic costs for designating critical habitat. As such, the economic
analysis for the longsolid and round hickorynut focuses on the
incremental impact of the critical habitat designation. The economic
analysis conducted for the critical habitat designation uses the rate
of past consultations conducted on similar listed aquatic species that
occur within the critical habitat areas to forecast the rate of future
section 7 consultations that may occur for the longsolid and round
hickorynut (IEc 2020, entire; Service 2020, entire). Critical habitat
designation is not anticipated to result in additional conservation
efforts being included as part of section 7 consultations beyond what
would have already been required absent critical habitat designation.
(5) Comment: The State of Ohio commented that although listing
round hickorynut is logical, they are concerned and disagree with
designating critical habitat in the Grand River through the shipping
channel. Further, they stated that the shipping channel portion of the
Grand River is regularly dredged to provide access to Lake Erie, and
the dredging has resulted in stream channel modifications for marinas
and docks.
Our Response: We agree that the Grand River has experienced human-
caused modifications over time. However, the Grand River population of
round hickorynut is considered one of only two stronghold management
units that remain, and the best available information indicates that
the shipping channel portion of the river is occupied. Further, because
the round hickorynut appears to have adapted to conditions at river
outflows and along shorelines of impoundments (e.g., Lake St. Clair),
we find it is important at this time that the lower Grand River
maintains some level of connectivity with other Lake Erie tributaries,
such as the Black River in Ohio, and the Belle, Black, and Pine Rivers
in Michigan.
The Grand River Unit (RH 2) is the only critical habitat unit
designated for the round hickorynut in the Great Lakes basin. This area
was once fully connected to Lake Erie, which allowed connectivity with
other river tributary systems. The Grand River population, occurring
within this unit, is important because it currently has high
resiliency, it contains the only documented recruiting population in
the Great Lakes basin, and the round hickorynut occurs throughout the
river. Accordingly, we determined this unit contains features that are
essential to the conservation of the species and that may require
special management considerations or protection and, therefore, that it
meets the definition of critical habitat.
(6) Comment: The State of Mississippi (Mississippi Forestry
Association) requested that we take into consideration the State's BMP
compliance rate for certified forest lands when evaluating information
for the
[[Page 14834]]
round hickorynut, specifically for SMZs.
The comment states that BMPs are nonregulated, voluntary guidelines
for silviculture activities that, when properly applied, will protect
water quality from non-point source pollutants while maintaining site
productivity. Further, the comment noted that the 2019 BMP
Implementation Survey (implemented on a 3-year cycle by the Mississippi
Forestry Commission) revealed that 95.3 percent of the applicable BMPs
were implemented. The Statewide compliance of the survey was determined
to be 95 percent at the 95 percent confidence level. The comment
asserts that the SMZs benefit the mussels by protecting water quality
through filtering nutrients and trapping sediments, regulating water
temperature, and acting as a protective barrier around the body of
water to limit activity near the channel.
Our Response: We did take into consideration the Mississippi BMP
compliance rate in SMZs. However, only one population of round
hickorynut occurs within Mississippi, and it is currently in low
condition. The Mississippi BMPs are nonregulated, voluntary guidelines
for silviculture activities. We recognize the high compliance rates of
BMPs on State-certified forest lands and we have incorporated an
exception under the section 4(d) rule for silvicultural activities that
implement state-approved BMPs.
(7) Comment: The State of Mississippi (Mississippi Forestry
Association) stated that they interpret the critical habitat
designation to include the river channel, and they requested
clarification that the lands adjacent to the stream bank are not
included in the critical habitat designation.
Our Response: The State of Mississippi's interpretation is correct.
Lands adjacent to the stream bank are not included in the critical
habitat designation, although certain activities on lands adjacent to
occupied streams can influence the resource needs of the listed species
that occurs within the river (e.g., increased sediments from activities
on adjacent lands could reduce water quality).
Public Comments--Economics
(8) Comment: One commenter stated that the benefits of excluding
the proposed areas in Kentucky from the critical habitat designations
due to economic impact far outweigh the benefits of their inclusion.
With over 2,000 river miles across 9 States, and an extensive list of
industries and activities impacted by the proposed critical habitat
designations, the commenter asserted that the anticipated $327,000 in
annual costs outlined in the economic analysis does not fully capture
the economic hardship placed on the surrounding communities.
Our Response: These comments do not identify specific data sources
or assumptions used in the economic analysis of critical habitat
designation, nor did the commenter provide new information that could
be used to revise our economic analysis. We find our economic analysis
presents a reasonable estimate of the incremental impact (the cost
beyond what would be incurred without the designation of critical
habitat for longsolid and round hickorynut). Our economic analysis
focuses on the incremental impact of the critical habitat designation
because the statutory purposes of the economic analysis are to inform
the mandatory consideration of the economic impact of the designation
of critical habitat, as well as to inform the discretionary section
4(b)(2) exclusion analysis, and to determine compliance with relevant
statutes and Executive Orders.
(9) Comment: Multiple commenters expressed concern about impacts of
the proposed rule on tourism and recreation; however, many commenters
focused on impacts associated with the proposed listing rule as
compared to impacts associated with the proposed 4(d) rule or critical
habitat designation. These commenters described the importance of
tourism to the local economies, particularly in the following Kentucky
counties: Rockcastle, Laurel (county seat is London), and Taylor. Some
commenters stated that they oppose any action that would limit the
current or future levels of fishing, boating, hiking, or other
recreational activities, including impacts to the lands adjoining the
affected rivers. One commenter stated that the proposed rule would
negatively impact the economy of this area to the point of halting the
growth and development of a community.
Our Response: The Act requires the Secretary to base listing
determinations solely on the best scientific and commercial data
available; thus, we cannot factor possible economic costs to tourism or
other industries into a decision to list a species. Although we
acknowledge that listing either species could result in additional
costs given the protections afforded to listed species, we do not
anticipate these protections as affecting current or future levels of
fishing, boating, hiking, or other recreational activities. Separately,
we are required to consider economic costs for designating critical
habitat. Our economic analysis of critical habitat designation does not
anticipate that the designation will result in additional conservation
efforts that would not already occur due to the listing of longsolid
and round hickorynut or presence of other listed species in critical
habitat areas. As such, the critical habitat designation for the
longsolid and round hickorynut is not anticipated to result in
additional restrictions or requirements for recreation and tourism
activities, beyond those already anticipated to occur absent of this
critical habitat designation.
(10) Comment: Several commenters expressed concern that the
proposed rule would adversely affect local farmers and livestock
producers; many commenters were focused on impacts associated with
listing the species. Commenters expressed concern that the proposed
rule would cause a loss of farming revenue, which would have broad
adverse effects on their communities. One commenter expressed concern
that the proposed rule may halt agricultural operations.
Our Response: It is our statutory requirement to ensure that
listing decisions are based solely on biological considerations and not
economic impacts; thus, costs from listing the longsolid or the round
hickorynut cannot be factored into the listing decisions. Because the
primary purpose of the economic analysis is to facilitate the mandatory
consideration of the economic impact of the designation of critical
habitat, to inform the discretionary section 4(b)(2) exclusion
analysis, and to determine compliance with relevant statutes and
Executive Orders, the economic analysis focused on the incremental
impact of the critical habitat designation. The economic analysis of
the designation of critical habitat for the longsolid and round
hickorynut follows this incremental approach. See also our responses to
Comments (8) and (9), above.
We recognize in the economic analysis that critical habitat
designation may cause landowners to perceive that private lands
(including farming, agricultural, or livestock operations) will be
subject to use restrictions or litigation from third parties, resulting
in costs. However, we are unable to quantify the degree to which the
public's perception of possible restrictions on the use of private land
designated as critical habitat may affect private property values.
Further, we recognize that a number of factors may already result in
perception-related effects on these private lands, including
[[Page 14835]]
the listing of the species and the presence of other listed species and
critical habitats in these areas, which may temper any additional
perception-related effects of this critical habitat designation.
(11) Comment: One commenter expressed concern that the economic
analysis does not sufficiently address the potential benefits of the
designation of critical habitat. Specifically, the commenter requests
that we take into consideration the economic benefits of protecting
habitat for these mussels, including ecosystem services, the protection
of clean water, the reduced cost of water treatment for drinking water
supplies, as well as public health benefits.
Our Response: The primary intended benefit of critical habitat
designation for the longsolid and round hickorynut is to support the
species' long-term conservation. Generally speaking, critical habitat
designation could also generate ancillary benefits such as improved
drinking water quality or public health benefits. However, as described
in section 3 of the economic analysis (Industrial Economics, Inc. 2020,
pp. 7-9), incremental land or water management changes are unlikely to
result from the designation of critical habitat for the longsolid and
round hickorynut. Similarly, no additional project modifications to
avoid adverse modification of critical habitat for the longsolid or
round hickorynut mussels are anticipated. Therefore, in this instance,
critical habitat designation is unlikely to incrementally affect the
types of ancillary benefits described by the commenter.
Public Comments--Forestry
(12) Comment: One commenter asserted that the information in the
proposed rule and the SSA report would lead the casual reader to think
that ``forest clearing'' is the same as ``silviculture,'' and that
these two activities are the leading threats to the species, which is
not the case.
Our Response: We agree that forest clearing and silviculture are
not synonymous and note that the latter is not a primary threat to the
longsolid or round hickorynut. For clarity, ``forest clearing'' is the
removal of forested habitats through tree removal to facilitate a
different land use, thereby altering ecosystem function. Silvicultural
practices control the growth, composition, structure, and quality of
forests at the stand-level to meet values and needs, specifically
timber production; however, they do not alter land use. The SSA reports
have been revised to clarify this distinction. Please see more
discussion and revised language regarding silviculture under Forest
Conversion in Threats Analysis, above.
(13) Comment: Multiple commenters asserted that forestry BMPs are
implemented at high rates nationally and in some States where one or
both species occur, and thus requested an exception in the 4(d) rule
for forestry activities.
Our Response: We recognize that silvicultural operations are widely
implemented in accordance with State-approved best management practices
(BMPs; as reviewed by Cristan et al. 2016, entire), and the adherence
to these BMPs broadly protects water quality, particularly related to
sedimentation (as reviewed by Cristan et al. 2016, entire; Warrington
et al. 2017, entire; and Schilling et al. 2021, entire). We added that
statement under Forest Conversion in Threats Analysis, above. In
addition, we agree that the best available science indicates that
proper implementation of forestry BMPs reduces negative effects on
water quality outcomes compared to historical silvicultural practices
or those that do not apply or properly implement BMPs. Given BMPs
generally are implemented at high rates, we added an exception to
incidental take in the section 4(d) rule resulting from forestry
activities that follow state approved forest management BMPs (see II.
Final Rule Issued Under Section 4(d) of the Act, above).
(14) Comment: One commenter stated that forest certification
programs provide assurance that BMPs are implemented in the ranges of
both species and requested the addition of an exception in the 4(d)
rule for State-certified forestry programs.
Our Response: We acknowledge and support the continued
implementation of the forest certification programs and their State-
approved BMPs. Given that we added an exception to incidental take in
the section 4(d) rule resulting from forestry activities that follow
state approved forest management BMPs and all State-certified forestry
programs implement these BMPs at high rates, an additional exception
specifically targeting State-certified forestry programs would be
redundant. We also note that most longsolid and round hickorynut
populations occurring on forest lands are within U.S. National Forests
(e.g., Allegheny, Daniel Boone, George Washington and Jefferson, and
Wayne National Forests), which are subject to section 7 consultation
even with the incidental take exception resulting from forestry and
silviculture activities.
(15) Comment: One commenter stated that take resulting from
silviculture activities should not be included in a 4(d) rule for the
longsolid because of the limited scope of this species' potential nexus
with silviculture activities; another commenter encouraged the Service
to recognize the positive role of responsible forest management and to
articulate this in the final rule. As such, the commenter recommended
adding an exception to the 4(d) rule for silvicultural practices and
forest management activities that implement State-approved BMPs.
Our Response: To the extent silvicultural practices are implemented
in a manner that follows State-approved BMPs, we agree with the
commenter that there is limited potential for the longsolid to be
exposed to silvicultural activities. We recognize responsible forest
management that implements State-approved BMPs as a land use activity
that can promote stable riparian vegetation and aquatic habitats. The
4(d) rule is intended to provide exceptions for proactive conservation
efforts, such as population and habitat restoration and protection.
Therefore, in the 4(d) rule for longsolid and round hickorynut, we have
added an exception for incidental take resulting from forestry
activities that follow State-approved forest management BMPs.
Public Comments--Miscellaneous
(16) Comment: Several commenters claimed that the proposed critical
habitat designations are insufficient. Generally, the commenters
contend that the current occupied habitat does not provide enough space
for the populations to recover and that unoccupied habitat should be
included in the critical habitat designation in anticipation of the
species' restoration or population expansion. One commenter requested
designation of unoccupied habitat in the Cumberland, Ohio, and
Tennessee River basins for both species, while a different commenter
also included the Great Lakes and Lower Mississippi River basins
specifically for the round hickorynut.
Our Response: Under the first prong of the Act's definition of
critical habitat, areas within the geographical area occupied by the
species at the time it was listed are included in a critical habitat
designation if they contain physical or biological features (1) which
are essential to the conservation of the species and (2) which may
require special management considerations or protection. For these
areas, critical habitat designations identify, to the extent known
using the best scientific
[[Page 14836]]
and commercial data available, those physical or biological features
that are essential to the conservation of the species (such as space,
food, cover, and protected habitat). In identifying those physical or
biological features within an area, we focus on the specific features
that support the life-history needs of the species, including but not
limited to, water characteristics, soil type, geological features,
prey, vegetation, symbiotic species, or other features.
We determine whether unoccupied areas are essential for the
conservation of the species by considering the life-history, status,
and conservation needs of the species. This determination is further
informed by any generalized conservation strategy, criteria, or outline
that may have been developed for the species to provide a substantive
foundation for identifying which features and specific areas are
essential to the conservation of the species and, as a result, the
development of the critical habitat designation.
We are not proposing to designate as critical habitat any areas
outside the geographical area currently occupied by the species because
we determined that occupied areas are sufficient to conserve the
longsolid and round hickorynut. For the longsolid, in total, we are
designating approximately 1,115 river mi (1,794 river km) within 12
units of critical habitat; and for the round hickorynut, in total, we
are designating approximately 921 river mi (1,482 river km) within 14
units of critical habitat. The critical habitat designation focuses on
current strongholds and those populations with sufficient resiliency in
determining the features that are essential for the conservation of the
species (see Criteria Used to Identify Critical Habitat, above). These
rivers and streams (identified as critical habitat for the longsolid
and round hickorynut) contain populations that are large and dense
enough, that are most likely to be self-sustaining over time (despite
fluctuations in local conditions), and that also have retained the
physical or biological features that will allow for the maintenance and
expansion of existing populations. These units also represent
populations that are stable and distributed over a wide geographic
area. We recognize that habitat is dynamic, and species may move from
one area to another over time. Thus, critical habitat designated at a
particular point in time may not include all of the habitat areas that
we may later determine are necessary for the recovery of the species.
For these reasons, a critical habitat designation does not signal that
habitat outside the designated area is unimportant or may not be needed
eventually for recovery of the species. Areas that are important to the
conservation of the species, both inside and outside the critical
habitat designation, will continue to be subject to: (1) Conservation
actions implemented under section 7(a)(1) of the Act; (2) regulatory
protections afforded by the requirement in section 7(a)(2) of the Act
for Federal agencies to ensure their actions are not likely to
jeopardize the continued existence of any endangered or threatened
species; and (3) the prohibitions found in section 9 of the Act.
Required Determinations
Regulatory Planning and Review (Executive Orders 12866 and 13563)
Executive Order 12866 provides that the Office of Information and
Regulatory Affairs (OIRA) in the Office of Management and Budget will
review all significant rules. OIRA has determined that this rule is not
significant.
Executive Order 13563 reaffirms the principles of E.O. 12866 while
calling for improvements in the nation's regulatory system to promote
predictability, to reduce uncertainty, and to use the best, most
innovative, and least burdensome tools for achieving regulatory ends.
The executive order directs agencies to consider regulatory approaches
that reduce burdens and maintain flexibility and freedom of choice for
the public where these approaches are relevant, feasible, and
consistent with regulatory objectives. E.O. 13563 emphasizes further
that regulations must be based on the best available science and that
the rulemaking process must allow for public participation and an open
exchange of ideas. We have developed this final rule in a manner
consistent with these requirements.
Regulatory Flexibility Act (5 U.S.C. 601 et seq.)
Under the Regulatory Flexibility Act (RFA; 5 U.S.C. 601 et seq.),
as amended by the Small Business Regulatory Enforcement Fairness Act of
1996 (SBREFA; 5 U.S.C. 801 et seq.), whenever an agency is required to
publish a notice of rulemaking for any proposed or final rule, it must
prepare and make available for public comment a regulatory flexibility
analysis that describes the effects of the rule on small entities
(i.e., small businesses, small organizations, and small government
jurisdictions). However, no regulatory flexibility analysis is required
if the head of the agency certifies the rule will not have a
significant economic impact on a substantial number of small entities.
The SBREFA amended the RFA to require Federal agencies to provide a
certification statement of the factual basis for certifying that the
rule will not have a significant economic impact on a substantial
number of small entities.
According to the Small Business Administration, small entities
include small organizations such as independent nonprofit
organizations; small governmental jurisdictions, including school
boards and city and town governments that serve fewer than 50,000
residents; and small businesses (13 CFR 121.201). Small businesses
include manufacturing and mining concerns with fewer than 500
employees, wholesale trade entities with fewer than 100 employees,
retail and service businesses with less than $5 million in annual
sales, general and heavy construction businesses with less than $27.5
million in annual business, special trade contractors doing less than
$11.5 million in annual business, and agricultural businesses with
annual sales less than $750,000. To determine if potential economic
impacts to these small entities are significant, we considered the
types of activities that might trigger regulatory impacts under this
designation as well as types of project modifications that may result.
In general, the term ``significant economic impact'' is meant to apply
to a typical small business firm's business operations.
Under the RFA, as amended, and following recent court decisions,
Federal agencies are required to evaluate the potential incremental
impacts of rulemaking on those entities directly regulated by the
rulemaking itself; in other words, the RFA does not require agencies to
evaluate the potential impacts to indirectly regulated entities. The
regulatory mechanism through which critical habitat protections are
realized is section 7 of the Act, which requires Federal agencies, in
consultation with the Service, to ensure that any action authorized,
funded, or carried out by the agency is not likely to destroy or
adversely modify critical habitat. Therefore, under section 7, only
Federal action agencies are directly subject to the specific regulatory
requirement (avoiding destruction and adverse modification) imposed by
critical habitat designation. Consequently, it is our position that
only Federal action agencies will be directly regulated by this
critical habitat designation. There is no requirement under the RFA to
evaluate the potential impacts to entities not directly regulated.
Moreover, Federal agencies are not small entities. Therefore, because
no small entities will
[[Page 14837]]
be directly regulated by this rulemaking, we certify that this critical
habitat designation will not have a significant economic impact on a
substantial number of small entities.
During the development of this final rule, we reviewed and
evaluated all information submitted during the comment period on the
September 29, 2020, proposed rule (85 FR 61384) that may pertain to our
consideration of the probable incremental economic impacts of this
critical habitat designation. Based on this information, we affirm our
certification that this critical habitat designation will not have a
significant economic impact on a substantial number of small entities,
and a regulatory flexibility analysis is not required.
Energy Supply, Distribution, or Use--Executive Order 13211
Executive Order 13211 (Actions Concerning Regulations That
Significantly Affect Energy Supply, Distribution, or Use) requires
agencies to prepare Statements of Energy Effects when undertaking
certain actions. Facilities that provide energy supply, distribution,
or use occur within some units of the critical habitat designations
(e.g., dams, pipelines) and may potentially be affected. We determined
that consultations, technical assistance, and requests for species
lists may be necessary in some instances. However, in our economic
analysis, we did not find that these critical habitat designations
would significantly affect energy supplies, distribution, or use.
Therefore, this action is not a significant energy action, and no
Statement of Energy Effects is required.
Unfunded Mandates Reform Act (2 U.S.C. 1501 et seq.)
In accordance with the Unfunded Mandates Reform Act (2 U.S.C. 1501
et seq.), we make the following findings:
(1) This rule will not produce a Federal mandate. In general, a
Federal mandate is a provision in legislation, statute, or regulation
that would impose an enforceable duty upon State, local, or Tribal
governments, or the private sector, and includes both ``Federal
intergovernmental mandates'' and ``Federal private sector mandates.''
These terms are defined in 2 U.S.C. 658(5)-(7). ``Federal
intergovernmental mandate'' includes a regulation that ``would impose
an enforceable duty upon State, local, or Tribal governments'' with two
exceptions. It excludes ``a condition of Federal assistance.'' It also
excludes ``a duty arising from participation in a voluntary Federal
program,'' unless the regulation ``relates to a then-existing Federal
program under which $500,000,000 or more is provided annually to State,
local, and Tribal governments under entitlement authority,'' if the
provision would ``increase the stringency of conditions of assistance''
or ``place caps upon, or otherwise decrease, the Federal Government's
responsibility to provide funding,'' and the State, local, or Tribal
governments ``lack authority'' to adjust accordingly. At the time of
enactment, these entitlement programs were: Medicaid; Aid to Families
with Dependent Children work programs; Child Nutrition; Food Stamps;
Social Services Block Grants; Vocational Rehabilitation State Grants;
Foster Care, Adoption Assistance, and Independent Living; Family
Support Welfare Services; and Child Support Enforcement. ``Federal
private sector mandate'' includes a regulation that ``would impose an
enforceable duty upon the private sector, except (i) a condition of
Federal assistance or (ii) a duty arising from participation in a
voluntary Federal program.''
The designation of critical habitat does not impose a legally
binding duty on non-Federal Government entities or private parties.
Under the Act, the only regulatory effect is that Federal agencies must
ensure that their actions are not likely to destroy or adversely modify
critical habitat under section 7. While non-Federal entities that
receive Federal funding, assistance, or permits, or that otherwise
require approval or authorization from a Federal agency for an action,
may be indirectly impacted by the designation of critical habitat, the
legally binding duty to avoid destruction or adverse modification of
critical habitat rests squarely on the Federal agency. Furthermore, to
the extent that non-Federal entities are indirectly impacted because
they receive Federal assistance or participate in a voluntary Federal
aid program, the Unfunded Mandates Reform Act would not apply, nor
would critical habitat shift the costs of the large entitlement
programs listed above onto State governments.
(2) We do not believe that this rule will significantly or uniquely
affect small governments because it will not produce a Federal mandate
of $100 million or greater in any year, that is, it is not a
``significant regulatory action'' under the Unfunded Mandates Reform
Act. The designation of critical habitat for the longsolid and round
hickorynut imposes no obligations on State or local governments.
Therefore, a Small Government Agency Plan is not required.
Takings--Executive Order 12630
In accordance with E.O. 12630 (Government Actions and Interference
with Constitutionally Protected Private Property Rights), we have
analyzed the potential takings implications of designating critical
habitat for the longsolid and round hickorynut in a takings
implications assessment. The Act does not authorize us to regulate
private actions on private lands or confiscate private property as a
result of critical habitat designation. Designation of critical habitat
does not affect land ownership, or establish any closures, or
restrictions on use of or access to the designated areas. Furthermore,
the designation of critical habitat does not affect landowner actions
that do not require Federal funding or permits, nor does it preclude
development of habitat conservation programs or issuance of incidental
take permits to permit actions that do require Federal funding or
permits to go forward. However, Federal agencies are prohibited from
carrying out, funding, or authorizing actions that would destroy or
adversely modify critical habitat. A takings implications assessment
has been completed and concludes that this designation of critical
habitat for the longsolid and round hickorynut does not pose
significant takings implications for lands within or affected by the
designation.
Federalism--Executive Order 13132
In accordance with E.O. 13132 (Federalism), this rule does not have
significant Federalism effects. A federalism summary impact statement
is not required. In keeping with Department of the Interior and
Department of Commerce policy, we requested information from, and
coordinated development of these critical habitat designations with,
appropriate State resource agencies. From a federalism perspective, the
designation of critical habitat directly affects only the
responsibilities of Federal agencies. The Act imposes no other duties
with respect to critical habitat, either for States and local
governments, or for anyone else. As a result, this final rule does not
have substantial direct effects either on the States, or on the
relationship between the national government and the States, or on the
distribution of powers and responsibilities among the various levels of
government. The designations may have some benefit to these governments
because the areas that contain the features essential to the
conservation of the species are more clearly defined, and the physical
or
[[Page 14838]]
biological features of the habitat necessary for the conservation of
the species are specifically identified. This information does not
alter where and what federally sponsored activities may occur. However,
it may assist State and local governments in long-range planning
because they no longer have to wait for case-by-case section 7
consultations to occur.
Where State and local governments require approval or authorization
from a Federal agency for actions that may affect critical habitat,
consultation under section 7(a)(2) of the Act will be required. While
non-Federal entities that receive Federal funding, assistance, or
permits, or that otherwise require approval or authorization from a
Federal agency for an action, may be indirectly impacted by the
designation of critical habitat, the legally binding duty to avoid
destruction or adverse modification of critical habitat rests squarely
on the Federal agency.
Civil Justice Reform--Executive Order 12988
In accordance with Executive Order 12988 (Civil Justice Reform),
the Office of the Solicitor has determined that the rule will not
unduly burden the judicial system and that it meets the requirements of
sections 3(a) and 3(b)(2) of the Order. We are designating critical
habitat in accordance with the provisions of the Act. To assist the
public in understanding the habitat needs of the species, this final
rule identifies the physical or biological features essential to the
conservation of the species. The designated areas of critical habitat
are presented on maps, and the rule provides several options for the
interested public to obtain more detailed location information, if
desired.
Paperwork Reduction Act of 1995 (44 U.S.C. 3501 et seq.)
This rule does not contain information collection requirements, and
a submission to the Office of Management and Budget (OMB) under the
Paperwork Reduction Act of 1995 (44 U.S.C. 3501 et seq.) is not
required. We may not conduct or sponsor and you are not required to
respond to a collection of information unless it displays a currently
valid OMB control number.
National Environmental Policy Act (42 U.S.C. 4321 et seq.)
Regulations adopted pursuant to section 4(a) of the Act are exempt
from the National Environmental Policy Act (NEPA; 42 U.S.C. 4321 et
seq.) and do not require an environmental analyses under NEPA. We
published a notice outlining our reasons for this determination in the
Federal Register on October 25, 1983 (48 FR 49244). This includes
listing, delisting, and reclassification rules, as well as critical
habitat designations and species-specific protective regulations
promulgated concurrently with a decision to list or reclassify a
species as threatened. The courts have upheld this position (e.g.,
Douglas County v. Babbitt, 48 F.3d 1495 (9th Cir. 1995) (critical
habitat); Center for Biological Diversity v. U.S. Fish and Wildlife
Service., 2005 WL 2000928 (N.D. Cal. Aug. 19, 2005) (concurrent 4(d)
rule)).
Government-to-Government Relationship With Tribes
In accordance with the President's memorandum of April 29, 1994
(Government-to-Government Relations with Native American Tribal
Governments; 59 FR 22951), Executive Order 13175 (Consultation and
Coordination with Indian Tribal Governments), and the Department of the
Interior's manual at 512 DM 2, we readily acknowledge our
responsibility to communicate meaningfully with recognized federally
recognized Tribes on a government-to-government basis. In accordance
with Secretarial Order 3206 of June 5, 1997 (American Indian Tribal
Rights, Federal-Tribal Trust Responsibilities, and the Endangered
Species Act), we readily acknowledge our responsibilities to work
directly with Tribes in developing programs for healthy ecosystems, to
acknowledge that Tribal lands are not subject to the same controls as
Federal public lands, to remain sensitive to Indian culture, and to
make information available to Tribes. We have determined that no Tribal
lands fall within the boundaries of the final critical habitat for the
longsolid and round hickorynut, so no Tribal lands would be affected by
the designations.
References Cited
A complete list of references cited in this rulemaking is available
on the internet at https://www.regulations.gov and upon request from
the Asheville Ecological Services Field Office (see FOR FURTHER
INFORMATION CONTACT).
Authors
The primary authors of this final rule are the staff members of the
U.S. Fish and Wildlife Service's Species Assessment Team and the
Service's Asheville Ecological Services Field Office.
List of Subjects in 50 CFR Part 17
Endangered and threatened species, Exports, Imports, Reporting and
recordkeeping requirements, Transportation, Wildlife.
Regulation Promulgation
Accordingly, we amend part 17, subchapter B of chapter I, title 50
of the Code of Federal Regulations, as set forth below:
PART 17--ENDANGERED AND THREATENED WILDLIFE AND PLANTS
0
1. The authority citation for part 17 continues to read as follows:
Authority: 16 U.S.C. 1361-1407; 1531-1544; and 4201-4245, unless
otherwise noted.
0
2. Amend Sec. 17.11(h) by adding entries for ``Hickorynut, round'' and
``Longsolid'' to the List of Endangered and Threatened Wildlife in
alphabetical order under CLAMS to read as follows:
Sec. 17.11 Endangered and threatened wildlife.
* * * * *
(h) * * *
----------------------------------------------------------------------------------------------------------------
Listing citations and
Common name Scientific name Where listed Status applicable rules
----------------------------------------------------------------------------------------------------------------
* * * * * * *
Clams
* * * * * * *
Hickorynut, round............... Obovaria subrotunda Wherever found..... T 88 FR [Insert Federal
Register page where
the document begins],
March 9, 2023; 50 CFR
17.45(d); \4d\ 50 CFR
17.95(f).\CH\
[[Page 14839]]
* * * * * * *
Longsolid....................... Fusconaia Wherever found..... T 88 FR [Insert Federal
subrotunda. Register page where
the document begins],
March 9, 2023; 50 CFR
17.45(d); \4d\ 50 CFR
17.95(f).\CH\
* * * * * * *
----------------------------------------------------------------------------------------------------------------
0
3. Amend Sec. 17.45 by adding paragraphs (c) and (d) to read as set
forth below:
Sec. 17.45 Special rules--snails and clams.
* * * * *
(c) [Reserved]
(d) Longsolid (Fusconaia subrotunda) and round hickorynut (Obovaria
subrotunda).
(1) Prohibitions. The following prohibitions that apply to
endangered wildlife also apply to the longsolid and round hickorynut.
Except as provided under paragraph (d)(2) of this section and
Sec. Sec. 17.4 and 17.5, it is unlawful for any person subject to the
jurisdiction of the United States to commit, to attempt to commit, to
solicit another to commit, or cause to be committed, any of the
following acts in regard to these species:
(i) Import or export, as set forth at Sec. 17.21(b) for endangered
wildlife.
(ii) Take, as set forth at Sec. 17.21(c)(1) for endangered
wildlife.
(iii) Possession and other acts with unlawfully taken specimens, as
set forth at Sec. 17.21(d)(1) for endangered wildlife.
(iv) Interstate or foreign commerce in the course of commercial
activity, as set forth at Sec. 17.21(e) for endangered wildlife.
(v) Sale or offer for sale, as set forth at Sec. 17.21(f) for
endangered wildlife.
(2) Exceptions from prohibitions. In regard to these species, you
may:
(i) Conduct activities as authorized by a permit under Sec. 17.32.
(ii) Take, as set forth at Sec. 17.21(c)(2) through (c)(4) for
endangered wildlife.
(iii) Take, as set forth at Sec. 17.31(b).
(iv) Take incidental to an otherwise lawful activity caused by:
(A) Conservation and restoration efforts for listed species
conducted by State wildlife agencies, including, but not limited to,
population monitoring, relocation, and collection of broodstock; tissue
collection for genetic analysis; captive propagation; and subsequent
stocking into currently occupied and unoccupied areas within the
historical range of the species.
(B) Channel and bank restoration projects that create natural,
physically stable, ecologically functioning streams (or stream and
wetland systems) that are reconnected with their groundwater aquifers.
These projects can be accomplished using a variety of methods, but the
desired outcome is a natural channel with low shear stress (force of
water moving against the channel); bank heights that enable
reconnection to the floodplain; a reconnection of surface and
groundwater systems, resulting in perennial flows in the channel;
riffles and pools composed of existing soil, rock, and wood instead of
large imported materials; low compaction of soils within adjacent
riparian areas; and inclusion of riparian wetlands.
(C) Bank stabilization projects that use bioengineering methods to
replace pre-existing, bare, eroding stream banks with vegetated, stable
stream banks, thereby reducing bank erosion and instream sedimentation
and improving habitat conditions for the species. Following these
bioengineering methods, stream banks may be stabilized using native
species live stakes (live, vegetative cuttings inserted or tamped into
the ground in a manner that allows the stake to take root and grow),
native species live fascines (live branch cuttings, usually willows,
bound together into long, cigar-shaped bundles), or native species
brush layering (cuttings or branches of easily rooted tree species
layered between successive lifts of soil fill). Native species
vegetation includes woody and herbaceous species appropriate for the
region and habitat conditions. These methods will not include the sole
use of quarried rock (rip-rap) or the use of rock baskets or gabion
structures. Prior to channel restoration and bank stabilization
actions, surveys conducted in coordination with the appropriate Service
field office to determine presence of longsolid and round hickorynut
must be performed, and if located, relocation prior to project
implementation may be necessary, with post-implementation monitoring.
To qualify under this exemption, channel restoration and bank
stabilization actions must satisfy all Federal, State, and local
permitting requirements.
(D) Forest management activities that implement State-approved best
management practices.
(v) Possess and engage in other acts with unlawfully taken
wildlife, as set forth at Sec. 17.21(d)(2) for endangered wildlife.
0
4. Amend Sec. 17.95(f) by adding, immediately following the entry for
``Carolina Heelsplitter (Lasmigona decorata),'' entries for ``Round
Hickorynut (Obovaria subrotunda)'' and ``Longsolid (Fusconaia
subrotunda)'' to read as follows:
Sec. 17.95 Critical habitat--fish and wildlife.
* * * * *
(f) Clams and Snails.
* * * * *
Round Hickorynut (Obovaria subrotunda)
(1) Critical habitat units for the round hickorynut are depicted on
the maps in this entry for Jackson, Madison, and Marshall Counties,
Alabama; Fulton, Marshall, Pulaski, and Starke Counties, Indiana; Bath,
Butler, Campbell, Edmonson, Fleming, Green, Harrison, Hart, Kenton,
Laurel, Morgan, Nicholas, Pendleton, Pulaski, Rockcastle, Robertson,
Rowan, and Warren Counties, Kentucky; Montgomery County, Mississippi;
Bedford, Marshall, and Maury Counties, Tennessee; Ashtabula, Lake, and
Trumbull Counties, Ohio; Crawford and Mercer Counties, Pennsylvania;
and Braxton, Calhoun, Clay, Doddridge, Fayette, Gilmer, Kanawha,
Pleasants, Ritchie, Tyler, and Wood Counties, West Virginia.
(2) Within these areas, the physical or biological features
essential to the conservation of the round hickorynut consist of the
following components:
(i) Adequate flows, or a hydrologic flow regime (magnitude, timing,
frequency, duration, rate of change, and overall seasonality of
discharge over time), necessary to maintain benthic habitats where the
species is found and to maintain stream connectivity, specifically
providing for the exchange of nutrients and sediment for maintenance of
the mussel's and fish host's habitat and food availability, maintenance
of spawning habitat for native fishes, and the ability for newly
transformed juveniles to settle and become established in their
habitats. Adequate flows ensure delivery of oxygen, enable
reproduction, deliver food to filter-feeding mussels, and
[[Page 14840]]
reduce contaminants and fine sediments from interstitial spaces. Stream
velocity is not static over time, and variations may be attributed to
seasonal changes (with higher flows in winter/spring and lower flows in
summer/fall), extreme weather events (e.g., drought or floods), or
anthropogenic influence (e.g., flow regulation via impoundments).
(ii) Suitable substrates and connected instream habitats,
characterized by geomorphically stable stream channels and banks (i.e.,
channels that maintain lateral dimensions, longitudinal profiles, and
sinuosity patterns over time without an aggrading or degrading bed
elevation) with habitats that support a diversity of freshwater mussel
and native fish (such as, stable riffle-run-pool habitats that provide
flow refuges consisting of predominantly silt-free, stable sand,
gravel, and cobble substrates).
(iii) Water and sediment quality necessary to sustain natural
physiological processes for normal behavior, growth, and viability of
all life stages, including (but not limited to): Dissolved oxygen
(generally above 2 to 3 parts per million (ppm)), salinity (generally
below 2 to 4 ppm), and temperature (generally below 86 [deg]F ([deg]F)
(30 [deg]Celsius ([deg]C)). Additionally, water and sediment should be
low in ammonia (generally below 0.5 ppm total ammonia-nitrogen) and
heavy metal concentrations, and lack excessive total suspended solids
and other pollutants.
(iv) The presence and abundance of fish hosts necessary for
recruitment of the round hickorynut (i.e., eastern sand darter
(Ammocrypta pellucida), emerald darter (Etheostoma baileyi), greenside
darter (E. blennioides), Iowa darter (E. exile), fantail darter (E.
flabellare), Cumberland darter (E. susanae), spangled darter (E.
obama), variegate darter (E. variatum), blackside darter (Percina
maculata), frecklebelly darter (P. stictogaster), and banded sculpin
(Cottus carolinae)).
(3) Critical habitat does not include manmade structures (such as
buildings, aqueducts, runways, roads, and other paved areas) and the
land on which they are located existing within the legal boundaries on
April 10, 2023.
(4) Data layers defining map units were created by overlaying
Natural Heritage Element Occurrence data and U.S. Geological Survey
hydrologic data for stream reaches. The hydrologic data used in the
critical habitat maps were extracted from the U.S. Geological Survey
1:1M scale nationwide hydrologic layer (https://www.usgs.gov/core-science-systems/ngp/national-hydrography) with a projection of
EPSG:4269--NAD83 Geographic. Natural Heritage program and State mussel
database species presence data from Pennsylvania, Ohio, Indiana, West
Virginia, Kentucky, Tennessee, Alabama, and Mississippi were used to
select specific river and stream segments for inclusion in the critical
habitat layer. The maps in this entry, as modified by any accompanying
regulatory text, establish the boundaries of the critical habitat
designation. The coordinates or plot points or both on which each map
is based are available to the public at the Service's internet site at
https://www.regulations.gov at Docket No. FWS-R4-ES-2020-0010, and at
the field office responsible for this designation. You may obtain field
office location information by contacting one of the Service regional
offices, the addresses of which are listed at 50 CFR 2.2.
(5) Index map for the round hickorynut follows:
Figure 1 to Round Hickorynut (Obovaria subrotunda) paragraph (5)
BILLING CODE 4333-15-P
[[Page 14841]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.017
(6) Unit RH 1: Shenango River; Crawford and Mercer Counties,
Pennsylvania.
(i) Unit RH 1 consists of 22 river miles (mi) (35.5 kilometers
(km)) of the Shenango River in Crawford County, Pennsylvania, from
Pymatuning Dam downstream to the point of inundation by Shenango River
Lake near Big Bend, Mercer County, Pennsylvania. Approximately 15 river
mi (24.3 km; 68 percent) of riparian lands that border the unit are
private ownership, and 7 river mi (11.1 km; 32 percent) are public
(Federal or State) ownership. This unit is immediately downstream from
Pymatuning Dam, which is owned by the State of Pennsylvania.
(ii) Map of Unit RH 1 follows:
Figure 2 to Round Hickorynut (Obovaria subrotunda) paragraph (6)(ii)
[[Page 14842]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.018
(7) Unit RH 2: Grand River; Ashtabula, Lake, and Trumbull Counties,
Ohio.
(i) Unit RH 2 consists of 92 river mi (148.2 km) of the Grand River
in Ashtabula, Lake, and Trumbull Counties, Ohio. Approximately 59 river
mi (95.2 km; 64 percent) of riparian lands that border the unit are
private ownership, and 33 river mi (53 km; 36 percent) are public
(State or local) ownership. The Grand River is a State Wild and Scenic
River. The Wild River designation includes approximately 23 river mi
(37 km) from the Harpersfield Covered Bridge downstream to the Norfolk
and Western Railroad Trestle in Lake County, and approximately 33 mi
(53 km) from the U.S. Route 322 Bridge in Ashtabula County downstream
to the Harpersfield Covered Bridge. Harpersfield Dam within this unit
is operated by the U.S. Army Corps of Engineers.
(ii) Map of Unit RH 2 follows:
Figure 3 to Round Hickorynut (Obovaria subrotunda) paragraph (7)(ii)
[[Page 14843]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.019
(8) Unit RH 3: Tippecanoe River; Fulton, Marshall, Pulaski, and
Starke Counties, Indiana.
(i) Unit RH 3 consists of 75 river mi (120.8 km) of the Tippecanoe
River in Fulton, Marshall, Pulaski, and Starke Counties, Indiana.
Approximately 66 river mi (105.6 km; 89 percent) of riparian lands that
border the unit are private ownership, and 9 river mi (14.5 km; 11
percent) are public (State or easement) ownership.
(ii) Map of Unit RH 3 follows:
Figure 4 to Round Hickorynut (Obovaria subrotunda) paragraph (8)(ii)
[[Page 14844]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.020
(9) Unit RH 4: Middle Island Creek; Doddridge, Pleasants, and Tyler
Counties, West Virginia.
(i) Unit RH 4 consists of 75 stream mi (120.8 km) of Middle Island
Creek in Doddridge, Pleasants, and Tyler Counties, West Virginia.
Approximately 74.8 stream mi (120.4 km; 99 percent) of riparian lands
that border the unit are private ownership, and 0.2 stream mi (0.4 km;
less than 1 percent) is public ownership.
(ii) Map of Unit RH 4 follows:
Figure 5 to Round Hickorynut (Obovaria subrotunda) paragraph (9)(ii)
[[Page 14845]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.021
(10) Unit RH 5: Little Kanawha River; Calhoun, Gilmer, Ritchie, and
Wood Counties, West Virginia.
(i) Unit RH 5 consists of 110 stream mi (176.6 km) of the Little
Kanawha River in Calhoun, Gilmer, Ritchie, and Wood Counties, West
Virginia. Approximately 109 river mi (175.4 km; 99 percent) of riparian
lands that border the unit are private ownership, and 0.7 river mi (1.2
km; 1 percent) are public (Federal, State, or local) ownership. This
unit is directly below Burnsville Dam, which is operated by the U.S.
Army Corps of Engineers.
(ii) Map of Unit RH 5 follows:
Figure 6 to Round Hickorynut (Obovaria subrotunda) paragraph (10)(ii)
[[Page 14846]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.022
(11) Unit RH 6: Elk River; Braxton, Clay, and Kanawha Counties,
West Virginia.
(i) Unit RH 6 consists of 101 river mi (163 km) of the Elk River in
Braxton, Clay, and Kanawha Counties, West Virginia. Approximately 93
river mi (150.3 km; 92 percent) of riparian lands that border the unit
are private ownership, and 7 river mi (12.7 km; 8 percent) are public
(Federal, State, or local) ownership. This unit is immediately below
Sutton Dam, which is operated by the U.S. Army Corps of Engineers.
(ii) Map of Unit RH 6 follows:
Figure 7 to Round Hickorynut (Obovaria subrotunda) paragraph (11)(ii)
[[Page 14847]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.023
(12) Unit RH 7: Kanawha River; Fayette and Kanawha Counties, West
Virginia.
(i) Unit RH 7 consists of 37.5 river mi (60.4 km) of the Kanawha
River in Fayette and Kanawha Counties, West Virginia. Approximately 33
river mi (53.2 km; 90 percent) of riparian lands that border the unit
are private ownership, and 4 river mi (7.2 km; 10 percent) are public
(Federal, State, or local) ownership. London and Marmet locks and dams
within this unit are operated by the U.S. Army Corps of Engineers.
(ii) Map of Unit RH 7 follows:
Figure 8 to Round Hickorynut (Obovaria subrotunda) paragraph (12)(ii)
[[Page 14848]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.024
(13) Unit RH 8: Licking River; Bath, Campbell, Fleming, Harrison,
Kenton, Morgan, Nicholas, Pendleton, Robertson, and Rowan Counties,
Kentucky.
(i) Unit RH 8 consists of 150 river mi (241.9 km) of the Licking
River in Bath, Campbell, Fleming, Harrison, Kenton, Morgan, Nicholas,
Pendleton, Robertson, and Rowan Counties, Kentucky. Approximately 131
river mi (211.8 km; 87 percent) of riparian lands that border the unit
are private ownership, and 18 river mi (30 km; 13 percent) are public
(Federal, State, or local) ownership. This unit is directly below Cave
Run Dam, which is operated by the U.S. Army Corps of Engineers.
(ii) Map of Unit RH 8 follows:
Figure 9 to Round Hickorynut (Obovaria subrotunda) paragraph (13)(ii)
[[Page 14849]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.025
(14) Unit RH 9: Rockcastle River; Laurel, Pulaski, and Rockcastle
Counties, Kentucky.
(i) Unit RH 9 consists of 15.3 river mi (24.6 km) of the Rockcastle
River in Laurel, Pulaski, and Rockcastle Counties, Kentucky.
Approximately 0.3 river mi (0.4 km; 1 percent) of riparian lands that
border the unit is private ownership, and 15 river mi (24.2 km; 99
percent) are public (Federal; Daniel Boone National Forest) ownership.
(ii) Map of Unit RH 9 follows:
Figure 10 to Round Hickorynut (Obovaria subrotunda) paragraph (14)(ii)
[[Page 14850]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.026
(15) Unit RH 10: Buck Creek; Pulaski County, Kentucky.
(i) Unit RH 10 consists of 36 stream mi (58.1 km) of Buck Creek in
Pulaski County, Kentucky. Approximately 33 stream mi (52.6 km; 92
percent) of riparian lands that border the unit are private ownership,
and 3 stream mi (5.5 km; 8 percent) are public (State or local)
ownership.
(ii) Map of Unit RH 10 follows:
Figure 11 to Round Hickorynut (Obovaria subrotunda) paragraph (15)(ii)
[[Page 14851]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.027
(16) Unit RH 11: Green River; Hart, Edmonson, Green, Butler, and
Warren Counties, Kentucky.
(i) Unit RH 11 consists of 98 river mi (157.7 km) of the Green
River in Butler, Edmonson, Green, Hart, and Warren Counties, Kentucky.
Approximately 61 river mi (98.4 km; 62 percent) of riparian lands that
border the unit are private ownership, and 37 river mi (59.4 km; 38
percent) are public (Federal or State) ownership, including portions of
Mammoth Cave National Park. This unit is located directly below Green
River Lake Dam, which is operated by the U.S. Army Corps of Engineers.
(ii) Map of Unit RH 11 follows:
Figure 12 to Round Hickorynut (Obovaria subrotunda) paragraph (16)(ii)
[[Page 14852]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.028
(17) Unit RH 12: Paint Rock River; Jackson, Madison, and Marshall
Counties, Alabama.
(i) Unit RH 12 consists of 48 river mi (77.5 km) of the Paint Rock
River in Jackson, Madison, and Marshall Counties, Alabama.
Approximately 2 river mi (4.1 km; 2 percent) of riparian lands that
border the unit are private ownership, and 46 river mi (73.4 km; 98
percent) are public (Federal or State) ownership.
(ii) Map of Unit RH 12 follows:
Figure 13 to Round Hickorynut (Obovaria subrotunda) paragraph (17)(ii)
[[Page 14853]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.029
(18) Unit RH 13: Duck River; Bedford, Marshall, and Maury Counties,
Tennessee.
(i) Unit RH 13 consists of 59 river mi (94.8 km) of the Duck River
in Bedford, Marshall, and Maury Counties, Tennessee. Approximately 27
river mi (43.7 km; 47 percent) of riparian lands that border the unit
are private ownership, and 32 river mi (51.1 km; 53 percent) are public
(State or local) ownership.
(ii) Map of Unit RH 13 follows:
Figure 14 to Round Hickorynut (Obovaria subrotunda) paragraph (18)(ii)
[[Page 14854]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.030
(19) Unit RH 14: Big Black River; Montgomery County, Mississippi.
(i) Unit RH 14 consists of 4 river mi (7 km) of the Big Black River
in Montgomery County, Mississippi. All of riparian lands that border
the unit are private ownership.
(ii) Map of Unit RH 14 follows:
Figure 15 to Round Hickorynut (Obovaria subrotunda) paragraph (19)(ii)
[[Page 14855]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.031
Longsolid (Fusconaia subrotunda)
(1) Critical habitat units for the longsolid are depicted on the
maps in this entry for Jackson, Madison, and Marshall Counties,
Alabama; Bath, Butler, Campbell, Edmonson, Fleming, Green, Harrison,
Hart, Kenton, Morgan, Nicholas, Pendleton, Robertson, Rowan, Taylor,
and Warren Counties, Kentucky; Clarion, Crawford, Erie, Forest, Mercer,
Venango, and Warren Counties, Pennsylvania; Claiborne, Hancock,
Hawkins, Smith, Trousdale, and Wilson Counties, Tennessee; Russell,
Scott, Tazewell, and Wise Counties, Virginia; and Braxton, Calhoun,
Clay, Doddridge, Fayette, Gilmer, Kanawha, Ritchie, Tyler, and Wood
Counties, West Virginia.
(2) Within these areas, the physical or biological features
essential to the conservation of the longsolid consist of the following
components:
(i) Adequate flows, or a hydrologic flow regime (magnitude, timing,
frequency, duration, rate of change, and overall seasonality of
discharge over time), necessary to maintain benthic habitats where the
species is found and
[[Page 14856]]
to maintain stream connectivity, specifically providing for the
exchange of nutrients and sediment for maintenance of the mussel's and
fish host's habitat and food availability, maintenance of spawning
habitat for native fishes, and the ability for newly transformed
juveniles to settle and become established in their habitats. Adequate
flows ensure delivery of oxygen, enable reproduction, deliver food to
filter-feeding mussels, and reduce contaminants and fine sediments from
interstitial spaces. Stream velocity is not static over time, and
variations may be attributed to seasonal changes (with higher flows in
winter/spring and lower flows in summer/fall), extreme weather events
(e.g., drought or floods), or anthropogenic influence (e.g., flow
regulation via impoundments).
(ii) Suitable substrates and connected instream habitats,
characterized by geomorphically stable stream channels and banks (i.e.,
channels that maintain lateral dimensions, longitudinal profiles, and
sinuosity patterns over time without an aggrading or degrading bed
elevation) with habitats that support a diversity of freshwater mussel
and native fish (such as, stable riffle-run-pool habitats that provide
flow refuges consisting of predominantly silt-free, stable sand,
gravel, and cobble substrates).
(iii) Water and sediment quality necessary to sustain natural
physiological processes for normal behavior, growth, and viability of
all life stages, including (but not limited to): Dissolved oxygen
(generally above 2 to 3 parts per million (ppm)), salinity (generally
below 2 to 4 ppm), and temperature (generally below 86 [deg]Fahrenheit
([deg]F) (30 [deg]Celsius ([deg]C)). Additionally, water and sediment
should be low in ammonia (generally below 0.5 ppm total ammonia-
nitrogen) and heavy metal concentrations, and lack excessive total
suspended solids and other pollutants.
(iv) The presence and abundance of fish hosts necessary for
recruitment of the longsolid (currently unknown, likely includes the
minnows of the family Cyprinidae and banded sculpin (Cottus
carolinae)).
(3) Critical habitat does not include manmade structures (such as
buildings, aqueducts, runways, roads, and other paved areas) and the
land on which they are located existing within the legal boundaries on
April 10, 2023.
(4) Data layers defining map units were created by overlaying
Natural Heritage Element Occurrence data and U.S. Geological Survey
hydrologic data for stream reaches. The hydrologic data used in the
critical habitat maps were extracted from the U.S. Geological Survey
1:1M scale nationwide hydrologic layer (https://www.usgs.gov/core-science-systems/ngp/national-hydrography) with a projection of
EPSG:4269--NAD83 Geographic. Natural Heritage program and State mussel
database species presence data from Pennsylvania, West Virginia,
Virginia, Kentucky, Tennessee, and Alabama were used to select specific
river and stream segments for inclusion in the critical habitat layer.
The maps in this entry, as modified by any accompanying regulatory
text, establish the boundaries of the critical habitat designation. The
coordinates or plot points or both on which each map is based are
available to the public at the Service's internet site at https://www.regulations.gov at Docket No. FWS-R4-ES-2020-0010, and at the field
office responsible for this designation. You may obtain field office
location information by contacting one of the Service regional offices,
the addresses of which are listed at 50 CFR 2.2.
(5) Index map for the longsolid follows:
Figure 1 to Longsolid (Fusconaia subrotunda) paragraph (5)
[[Page 14857]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.032
(6) Unit LS 1: French Creek; Crawford, Erie, Mercer, and Venango
Counties, Pennsylvania.
(i) Unit LS 1 consists of 120 stream mi (191.5 km) of French Creek
in Crawford, Erie, Mercer, and Venango Counties, Pennsylvania.
Approximately 106 stream mi (170.6 km; 76 percent) of riparian lands
that border the unit are private ownership, and 14 stream mi (22.1 km;
24 percent) are public (Federal or State) ownership. This unit begins
immediately downstream of the Union City Dam, which is operated by the
U.S. Army Corps of Engineers.
(ii) Map of Unit LS 1 follows:
Figure 2 to Longsolid (Fusconaia subrotunda) paragraph (6)(ii)
[[Page 14858]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.033
(7) Unit LS 2: Allegheny River; Clarion, Crawford, Forest, Venango,
and Warren Counties, Pennsylvania.
(i) Unit LS 2 consists of 99 river mi (159.3 km) of the Allegheny
River in Clarion, Crawford, Forest, Venango, and Warren Counties,
Pennsylvania. Approximately 15 river mi (24.1 km; 14 percent) of
riparian lands that border the unit are private ownership, and 84 river
mi (135.8 km; 86 percent) are public (Federal or State; primarily
Allegheny National Forest) ownership. This unit is immediately
downstream of Kinzua Dam, which is operated by the U.S. Army Corps of
Engineers.
(ii) Map of Unit LS 2 follows:
Figure 3 to Longsolid (Fusconaia subrotunda) paragraph (7)(ii)
[[Page 14859]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.034
(8) Unit LS 3: Shenango River; Crawford and Mercer Counties,
Pennsylvania.
(i) Unit LS 3 consists of 22 river miles (mi) (35.5 kilometers
(km)) of the Shenango River in Crawford County, Pennsylvania, from
Pymatuning Dam downstream to the point of inundation by Shenango River
Lake near Big Bend, Mercer County, Pennsylvania. Approximately 15 river
mi (24.3 km; 68 percent) of riparian lands that border the unit are
private ownership, and 7 river mi (11.3 km; 32 percent) are public
(Federal or State) ownership. This unit is immediately downstream from
the Pymatuning Dam, which is owned by the State of Pennsylvania.
(ii) Map of Unit LS 3 follows:
Figure 4 to Longsolid (Fusconaia subrotunda) paragraph (8)(ii)
[[Page 14860]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.035
(9) Unit LS 4: Middle Island Creek; Doddridge and Tyler Counties,
West Virginia.
(i) Unit LS 4 consists of 14 stream mi (23.7 km) of Middle Island
Creek in Doddridge and Tyler Counties, West Virginia. Approximately 14
stream mi (23.5 km; 99 percent) of riparian lands that border the unit
are private ownership, and 0.1 stream mi (0.2 km; less than 1 percent)
are public (local) ownership.
(ii) Map of Unit LS 4 follows:
Figure 5 to Longsolid (Fusconaia subrotunda) paragraph (9)(ii)
[[Page 14861]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.036
(10) Unit LS 5: Little Kanawha River; Calhoun, Gilmer, Ritchie, and
Wood Counties, West Virginia.
(i) Unit LS 5 consists of 123 river mi (198 km) of the Little
Kanawha River in Calhoun, Gilmer, Ritchie, and Wood Counties, West
Virginia. Approximately 122 river mi (197.2 km; 99 percent) are private
ownership, and 0.53 river mi (0.9 km; 1 percent) are public (Federal or
State) ownership. This unit is directly below the Burnsville Dam, which
is operated by the U.S. Army Corps of Engineers.
(ii) Map of Unit LS 5 follows:
Figure 6 to Longsolid (Fusconaia subrotunda) paragraph (10)(ii)
[[Page 14862]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.037
(11) Unit LS 6: Elk River; Braxton, Clay, and Kanawha Counties,
West Virginia.
(i) Unit LS 6 consists of 101 river mi (163 km) of the Elk River in
Braxton, Clay, and Kanawha Counties, West Virginia. Approximately 93
river mi (150.3 km; 92 percent) of riparian lands that border the unit
are private ownership, and 7 river mi (12.7 km; 8 percent) are public
(Federal, State, or local) ownership. This unit is directly below
Sutton Dam, which is operated by the U.S. Army Corps of Engineers.
(ii) Map of Unit LS 6 follows:
Figure 7 to Longsolid (Fusconaia subrotunda) paragraph (11)(ii)
[[Page 14863]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.038
(12) Unit LS 7: Kanawha River; Fayette and Kanawha Counties, West
Virginia.
(i) Unit LS 7 consists of 21 river mi (33.9 km) of the Kanawha
River in Fayette and Kanawha Counties, West Virginia. Approximately 18
river mi (29.3 km; 90 percent) of riparian lands that border the unit
are private ownership, and 2 river mi (4.6 km; 10 percent) are public
(Federal, State, or local) ownership. London and Marmet locks and dams
within this unit are operated by the U.S. Army Corps of Engineers.
(ii) Map of Unit LS 7 follows:
Figure 8 to Longsolid (Fusconaia subrotunda) paragraph (12)(ii)
[[Page 14864]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.039
(13) Unit LS 8: Licking River; Bath, Campbell, Fleming, Harrison,
Kenton, Morgan, Nicholas, Pendleton, Robertson, and Rowan Counties,
Kentucky.
(i) Unit LS 8 consists of 181 river mi (291.5 km) of the Licking
River in Bath, Campbell, Fleming, Harrison, Kenton, Morgan, Nicholas,
Pendleton, Robertson, and Rowan Counties, Kentucky. Approximately 161
river mi (259.7 km; 90 percent) of riparian lands that border the unit
are private ownership, and 19 river mi (31.7 km; 10 percent) are public
(Federal, State, or local) ownership. This unit is directly below Cave
Run Dam, which is operated by the U.S. Army Corps of Engineers.
(ii) Map of Unit LS 8 follows:
Figure 9 to Longsolid (Fusconaia subrotunda) paragraph (13)(ii)
[[Page 14865]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.040
(14) Unit LS 9: Green River; Butler, Edmonson, Green, Hart, Taylor,
and Warren Counties, Kentucky.
(i) Unit LS 9 consists of 156 river mi (251.6 km) of the Green
River in Butler, Edmonson, Green, Hart, Taylor, and Warren Counties,
Kentucky. Approximately 105 river mi (169.2 km; 67 percent) of riparian
lands that border the unit are private ownership, and 51 river mi (82.4
km; 33 percent) are public (Federal, State, or local) ownership,
including Mammoth Cave National Park. This unit is directly below Green
River Dam, which is operated by the U.S. Army Corps of Engineers.
(ii) Map of Unit LS 9 follows:
Figure 10 to Longsolid (Fusconaia subrotunda) paragraph (14)(ii)
[[Page 14866]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.041
(15) Unit LS 10: Cumberland River; Smith, Trousdale, and Wilson
Counties, Tennessee.
(i) Unit LS 10 consists of 48 river mi (77.5 km) of the Cumberland
River in Smith, Trousdale, and Wilson Counties, Tennessee. All riparian
lands that border the river are owned by the U.S. Army Corps of
Engineers (Federal; 48 river mi (77.5 km)). This unit also falls within
the Tennessee Wildlife Resources Agency's Rome Landing Sanctuary.
Cordell Hull and Old Hickory Dams, upstream and downstream of this
unit, respectively, are operated by the U.S. Army Corps of Engineers.
(ii) Map of Unit LS 10 follows:
Figure 11 to Longsolid (Fusconaia subrotunda) paragraph (15)(ii)
[[Page 14867]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.042
(16) Unit LS 11: Clinch River; Russell, Scott, Tazewell, and Wise
Counties, Virginia; Claiborne, Hancock, and Hawkins Counties,
Tennessee.
(i) Unit LS 11 consists of 177 river mi (286.1 km) of the Clinch
River in Russell, Scott, Tazewell, and Wise Counties, Virginia, and
Claiborne, Hancock, and Hawkins Counties, Tennessee. Approximately 160
river mi (258.8 km; 90 percent) of riparian lands that border the unit
are private ownership, and 17 river mi (27.3 km; 10 percent) are public
(Federal or State) ownership. The Tennessee portion of this unit is
encompassed by the Tennessee Wildlife Resources Agency's Clinch River
Sanctuary.
(ii) Map of Unit LS 11 follows:
Figure 12 to Longsolid (Fusconaia subrotunda) paragraph (16)(ii)
[[Page 14868]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.043
(17) Unit LS 12: Paint Rock River; Jackson, Madison, and Marshall
Counties, Alabama.
(i) Unit LS 12 consists of 58 river mi (94.5 km) of the Paint Rock
River in Jackson, Madison, and Marshall Counties, Alabama.
Approximately 2 river mi (4.1 km; 3 percent) of riparian lands that
border the unit are private ownership, and 56 river mi (90.4 km; 97
percent) are public (Federal or State) ownership.
(ii) Map of Unit LS 12 follows:
Figure 13 to Longsolid (Fusconaia subrotunda) paragraph (17)(ii)
[[Page 14869]]
[GRAPHIC] [TIFF OMITTED] TR09MR23.044
* * * * *
Martha Williams,
Director, U.S. Fish and Wildlife Service.
[FR Doc. 2023-03998 Filed 3-8-23; 8:45 am]
BILLING CODE 4333-15-C