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 904.03 - Tier 1 Stream Crossings

Universal Citation: NH Admin Rules Env-Wt 904.03

Current through Register No. 13, March 27, 2025

(a) A tier 1 stream crossing shall be a crossing located on a watercourse where the contributing watershed is less than or equal to 200 acres.

(b) Tier 1 stream crossings shall:

(1) Meet the general design considerations specified in Env-Wt 904.01;

(2) Be sized so as to accommodate the greater of:
a. The 50-year design storm; or

b. Applicable federal, state, or local requirements; and

(3) Be a span structure, pipe arch, open-bottom culvert, or closed-bottom culvert, with or without being embedded with stream simulation.

(c) An applicant may propose a design that does not meet the criteria of (b)(1) or (b)(2)a., above, by submitting a request for approval of an alternate design as specified in Env-Wt 904.10. In accordance with Env-Wt 903.01(f)(1)a., a project that includes a request to approve an alternative design for a tier 1 stream crossing shall be a minor impact project.

(d) An existing legal crossing that would be classified as tier 1 under (a), above, may be repaired or replaced in-kind as specified in Env-Wt 904.08 pursuant to:

(1) A routine roadway maintenance SPN as specified in Env-Wt 308.04 or registration as specified in Env-Wt 309.03; or

(2) If the crossing is part of a trail, a trail SPN as described in Env-Wt 308.04.

(e) Compensatory mitigation shall not be required for any tier 1 minimum impact project.

#9714, eff 5-12-10

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