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United States Environmental Protection Agency
EPA Office of Water (OW): NHDPlus v21+AK Beta WBD Hydrologic Units - Twelve-Digit Subwatersheds
This dataset contains twelve-digit hydrologic subwatershed units from the Watershed Boundary Dataset derived from NHDPlus v2.1 for the contiguous United States, Hawaii, Puerto Rico, the US Virgin Islands, Guam, American Samoa and the Northern Mariana Islands. Alaskan regions are derived from the USGS Watershed Boundary Dataset (Nov 2017) used in the creation of the NHDPlus Beta for Alaska. Taken together this dataset provides a national watershed dataset for use with EPA Office of Water applications and analysis.
Time Period of Content
West Bounding Longitude:
East Bounding Longitude:
North Bounding Latitude:
South Bounding Latitude:
Although these data have been processed successfully on a computer system at the Environmental Protection Agency, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. It is strongly recommended that careful attention be paid to the contents of the metadata file associated with these data to evaluate data set limitations, restrictions or intended use. The U.S. Environmental Protection Agency shall not be held liable for improper or incorrect use of the data described and/or contained herein.
None. Please check sources, scale, accuracy, correctness and other available information. Please confirm that you are using the most recent copy of both data and metadata.
Environment and Conservation, Administrative and Political Boundaries, Geological and Geophysical, Inland Water Resources
U.S. Environmental Protection Agency
Metadata Reference Information
Metadata Date Stamp:
Metadata Standard Name:
FGDC Content Standard for Digital Geospatial Metadata
Metadata Standard Version: