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New Hampshire Department of Environmental Services
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New Hampshire Hydrography Dataset Program
NHHD flowlines displayed on a topographic map
The New Hampshire implementation of the National Hydrography Dataset (NHHD) is Geographic Information Systems data comprised of spatial features that represent natural and man-made surface waters such as lakes, reservoirs, ponds, rivers, streams and wetlands. These features are mapped as a combination of stream centerlines and “artificial paths” through water bodies at a scale of 1:24,000. more...

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

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