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What is the National Hydrography Dataset?

The National Hydrography Dataset (NHD) is the culmination of cooperative efforts of the U.S. Environmental Protection Agency (EPA) and U.S. Geological Survey (USGS). It combines the best of the EPA Reach File Version 3.0 (RF3) and USGS Digital Line Graph (DLG) hydrography files: hydrologic ordering, hydrologic navigation for modeling applications, and a unique identifier (reach code) for surface water features from RF3; and the spatial accuracy and comprehensiveness of DLG hydrography.

The NHD is now a USGS Web site that provides access to the data, as well as user guides and considerable additional information.

 

 

Tags: Maps, Rivers, Water, Geospatial, Streams, Data, Hydrography