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New Hampshire Department of Environmental Services

Streams and Stream Crossings
streams nh

New Hampshire’s streams are home to fish and other aquatic animals that travel the flowing waters to obtain food, spawn, and reach high quality habitat. These flowing waters carry, nutrients, sediment, and organic materials to reaches downstream -- ultimately the Atlantic Ocean. Across the state, there are at least 17,000 road-stream crossings, some of which have created obstructions to the adequate passage of flow, sediment, and wildlife.

New Hampshire is undertaking a variety of efforts to address the impacts of inadequate crossings on river systems and habitat and public safety. In May 2010, NHDES adopted rules for the permitting of structures for stream crossings. This page will serve as a central location for providing guidance for the design of such crossings, and information about training for those designing, constructing, and maintaining such crossings. The goals of this program are to provide for aquatic life passage during high and low flow conditions and to maximize the passage of high flows, particularly floodwaters, so that losses to infrastructure and adjacent property and public safety are minimized.

green arrow Education/Outreach

green arrow Technical Assistance

green arrow Resources

Determining Watershed Boundaries

Estimation of Flood Flows

Floodplain Maps and Related Information

Fluvial Erosion Hazards

Stream Impairments

Fluvial Geomorphology

New Hampshire Studies

Stream Simulation

Aquatic Organism Passage

Stream Restoration (and Stream Crossings)

Resources from Other States




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NH Department of Environmental Services | 29 Hazen Drive | PO Box 95 | Concord, NH 03302-0095
(603) 271-3503 | TDD Access: Relay NH 1-800-735-2964 | Hours: M-F, 8am-4pm

copyright 2017. State of New Hampshire