Watershed Boundaries, 8 unit (NRCS)

This layer shows the 8-digit Hydrologic Unit Code (HUC-8) boundaries for Maryland, representing subbasin-level drainage areas. These boundaries define the surface water drainage to a specific point, based on topography and water flow.

The data is sourced from the U.S. Geological Survey (USGS) and the USDA’s Natural Resources Conservation Service (NRCS), created through detailed hydrologic mapping and analysis.

• Source: United States Department of Agriculture (USDA) Natural Resources Conservation Service (NRCS)
• Original Download: https://datagateway.nrcs.usda.gov/GDGOrder.aspx?order=QuickState#
• Additional Information: https://gdg.sc.egov.usda.gov/Catalog/ProductDescription/WBD.html