New Hampshire Code of Administrative Rules
Env - Department of Environmental Services
Subtitle Env-Wt - Wetlands Programs
Chapter Env-Wt 900 - STREAM CROSSINGS; CERTIFIED CULVERT MAINTAINER PROGRAM
Part Env-Wt 904 - DESIGN AND CONSTRUCTION OF STREAM CROSSINGS
Section Env-Wt 904.06 - Tier 4 Stream Crossings

Universal Citation: NH Admin Rules Env-Wt 904.06

Current through Register No. 13, March 27, 2025

(a) A tier 4 stream crossing shall be a crossing located on a tidal watercourse.

(b) A tier 4 stream crossing shall be a span structure or a culvert specifically designed for the geomorphic and habitat conditions of the tidal environment.

(c) The applicant may propose an alternative design by submitting a request as specified in Env-Wt 904.10.

(d) Compensatory mitigation shall be required for any new tier 4 stream crossing unless the crossing:

(1) Meets the general design criteria in Env-Wt 904.01 and the tier-specific criteria in Env-Wt 904.07;

(2) Is self-mitigating;

(3) Improves aquatic organism passage, connectivity, and hydraulics; and

(4) Is not an alternative design or any design for which a waiver is needed.

(e) In addition to meeting Env-Wt 903.07(c) and (d), plans for a tier 4 stream crossing shall be dated and bear the signature and seal of the professional engineer who prepared or had responsibility for and approved them, as required by RSA 310-A:18.

#9714, eff 5-12-10

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