There are 2150 Cataloging Units in the Nation. This map is part of The National Atlas of the United States of America series. Its stock number is TUS5681. Paper maps may be ordered from USGS Information Services Digital Spatial Data Sets View of huc2m coverage. This is a sophisticated coverage with extensive documentation.
Attribute tables show hydrologic unit names and flow direction among cataloging units.
Unofficial offshore extensions of cataloging units are shown. The coverage was developed for work on the National Water Summary . The coverage is available on line, at no charge, via links from the metadata file. It may be retrieved as a single file for the entire U.S., or by Water Resources Region. The coverage is available on line, at no charge, via links from the metadata file.