Description: This data set represents the updated hydrologic accounting surface along the lower Colorado River from Lake Mead to the Yuma area. This data set was compiled by combining two original data sets, the hydrologic accounting surface created for WRIR 00-4085 showing the hydrologic accounting surface from Lake Mead to Laguna Dam, and the accounting surface created for WRIR 94-4005 showing the hydrologic accounting surface in the Yuma area. The resultant data set was then updated in the Yuma area to conform to Bureau of Reclamation requirements.
Description: This map layer portrays the State boundaries of the United States, and the boundaries of Puerto Rico and the U.S. Virgin Islands. The map layer was created by extracting the State boundary polygons from the individual 1:2,000,000-scale State boundary Digital Line Graph (DLG) files produced by the U.S. Geological Survey. These files were then merged into a single coverage. This is an updated version of the June 2002 map layer; the date when each State was admitted to the United States was added.