Description: This file contains Hydrologic Unit boundaries and codes for Arizona. The data is a seamless representation of Hydrologic Unit Code (HUC) boundaries at HUC06 level compiled from U.S. Geological Survey (USGS) National Hydrography Dataset (NHD) and U.S. Department of Agricultural (USDA) National Resources Conservation Services (NRCS) Watershed Boundary Dataset (WBD) sources.
Copyright Text: Original data from the USGS Water Resources Division (WRD), NHD, and the USDA NRCS Watershed Boundary Dataset (WBD) . Other updates contributed by U.S. Environmental Protection Agency (EPA), U.S. Forest Service and USGS NHD program data compilers as well as various State, Regional and Local agencies.