20240116 15122000 1.0 TRUE Watersheds (HUC8) This data set is a complete digital hydrologic unit boundary layer to Catalog Unit (8-digit) for the entire US. <br/> <a href='https://edg.epa.gov/metadata/rest/document?id={4BDFFA3C-710B-4A27-B8F5-A82C0F32FEE8}&xsl=metadata_to_html_full' target='_blank'>Metadata</a> Hydrologic Catalog Units