This data layer was produced from the Hydrologic Unit Code (HUC) boundaries developed by USGS at a scale of 1:2,000,000. The National HUC dataset was intersected with the boundary file for the 11 western states. (HUC) boundaries are a subdivision of the United States made by the USGS, to show major and minor river basins .

Any comments should be directed to R. Douglas Ramsey. These data are provided free of charge.

Citation Information: R. Douglas Ramsey, Remote Sensing and GIS Laboratory, Department of Geography and Earth Resources, Utah State University, 84322-5240. Derived from the USGS 1:2,000,000 HUC data layer.

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