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Watershed Boundary Dataset (WBD): 12-digit Hydrologic Units

USDA "GeoSpatial Data Gateway" (For official NRCS work)

https://gdg.sc.egov.usda.gov/

USGS "The National Map Viewer" (WBD data is available under the “Hydrography (NHD)” layer)

http://viewer.nationalmap.gov/viewer/

USGS Landing Page for the WBD (On the left side menu, select “Get Data”)

http://nhd.usgs.gov/wbd.html