Current through Register Vol. 63, No. 9, September 1, 2024
(1) Bio-Engineering. This activity includes
placement of woody vegetation, vegetated geogrids, biodegradable logs, straw
bales or straw logs used for bank protection, bank reshaping, terracing and
erosion control.
(2) Bank
Terracing. This activity includes bank terracing and sloping to facilitate
establishment of woody vegetation. The project must meet the following
criteria:
(a) The slope must not be steeper
than 3:1 (H/V) ratio;
(b) Bank
treatments must be replanted with native woody vegetation; and
(c) If fabric is necessary, no
petroleum-based fabric is allowed.
(3) Placement of Large Wood. Trees or root
wads may be used. The project must meet the following criteria:
(a) Trees must have a trunk diameter greater
than or equal to 12 inches;
(b) The
basal ends must be oriented upstream;
(c) If fastening is necessary, only smooth,
single-string wire, degradable rope or pinning may be used. Braided wire cable
is not allowed; and
(d) If
anchoring is necessary, only rock ballast, untreated wood posts, stabilizing
wood or key pieces of wood may be used as anchors.
(4) Engineered Log Jams. Log jams may be
placed in order to stabilize the bank for woody vegetation establishment. The
project must meet the following criteria:
(a)
The length of key pieces of wood with trimmed rootwads must be one and one-half
times the bankfull width or a minimum of 25 feet in length when bankfull width
exceeds 15 feet. The length of key pieces of wood with trimmed rootwads must be
the twice the bankfull width or a minimum of 30 feet in length when bankfull
width exceeds 15 feet;
(b) Large
wood must be intact, hard and undecayed to partially decayed hardwoods or
conifers;
(c) The log jam must not
occupy more than 20 percent of the bankfull width;
(d) If fastening is necessary, only smooth,
single-string wire, pinning or degradable rope may be used. Braided wire cable
is not allowed; and
(e) If
anchoring is necessary, only rock ballast, untreated posts, stabilizing wood or
key pieces of wood may be used as anchors.
(5) Log Toe Placement. The project must meet
the following criteria:
(a) Log toes must not
extend more than one foot above the elevation of the water at base flow;
and
(b) Logs must be large enough
to withstand the hydraulic energy in the stream and be anchored securely to the
bank by burial.
(6)
Porous Weir. This activity includes the construction of a self-sustaining, low
profile, structure including but not limited to cross vanes and artificial
riffles. A porous weir delays but does not store water. It is used to redirect
flow toward the center of the channel, provide energy dissipation and promote
increased sedimentation along banks while allowing fish passage through a
porous design. The project must meet the following criteria:
(a) Porous weirs must be placed so scour
pools occur in areas where pools would naturally form in a pool and riffle
complex;
(b) Porous weirs must not
result in culvert inlet or outlet scour;
(c) Porous weirs must be sized appropriately
for the system so as not to require annual maintenance;
(d) Porous weirs must be constructed of
materials that mimic natural substrate found within the system;
(e) The structure must not exceed 100 cubic
yards and 40% of the channel cross-section width; and
(f) The activity is limited to 100 cubic
yards for every one-half mile of waterway, unless otherwise approved by the
Department.
Statutory/Other Authority: ORS 196.600 - 196.692 &
196.795 - 196.990
Statutes/Other Implemented: ORS 196.600 - 196.692 &
196.795 - 196.990
