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Federal
Watershed Boundary Dataset (WBD) - USGS National Map Downloadable Data Collection NGDA 39 recent views
Department of the Interior —
The Watershed Boundary Dataset (WBD) is a comprehensive aggregated collection of hydrologic unit data consistent with the national criteria for delineation and... -
Federal
Drainage Basins Used for Assessing Trends in Concentration of Pesticides in Streams of the United States, 1992-2010
Department of the Interior —
This dataset consists of drainage basin boundaries for 212 U.S. Geological Survey (USGS) stream sites sampled in the National Water-Quality Assessment (NAWQA)... -
Federal
National Stream Quality Accounting Network and National Monitoring Network Basin Boundary Geospatial Dataset, 2008-13
Department of the Interior —
This dataset and the accompanying Data Series report was created to assist in analysis and interpretation of water-quality data provided by the U.S. Geological...