State of NebraskaThe hydrologic unit code is an eight-digit number that identifies each hydrologic unit. The code uniquely identifies each of the four levels-regional, subregional, accounting, and cataloging-of hydrologic classification within four two-digit fields . https://pubs.usgs.gov/gip/hydrologic_units/pdf/hydrologic_units.pdfArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/99a3b82ee06844d1804df0742112cad0_1engNebraskaMapPublicHUC 10 [Nebraska]Web servicesNebraskaLast Modified: 2025-05-18