The Upper Colorado water resource region is one of 21 major geographic areas, or regions, in the first level of classification used by the United States Geological Survey to divide and sub-divide the United States into successively smaller hydrologic units. These geographic areas contain either the drainage area of a major river, or the combined drainage areas of a series of rivers.
The Upper Colorado region, which is listed with a 2-digit hydrologic unit code (HUC) of 14, has an approximate size of , and consists of 8 subregions, which are listed with the 4-digit HUCs 1401 through 1408.
This region includes the drainage of: (a) the Colorado River Basin above the Lee Ferry compact point which is one mile below the mouth of the Paria River; and (b) the Great Divide closed basin. Includes parts of Arizona, Colorado, New Mexico, Utah, and Wyoming.
List of water resource subregions Subregion HUC Subregion Name Subregion Description Subregion Location Subregion Size Subregion Map 1401 Colorado headwaters subregion The Colorado River Basin to but excluding the Bitter Creek Basin, and excluding the Gunnison River Basin. Colorado and Utah. 1402 Gunnison subregion The Gunnison River Basin. Colorado 1403 Upper Colorado–Dolores subregion The Colorado River Basin from and including the Bitter Creek Basin to the confluence with the Green River Basin. Colorado and Utah. 1404 Great Divide – Upper Green subregion The Green River Basin above the confluence with the Yampa River Basin; and the Great Divide closed basin. Utah and Wyoming. 1405 White–Yampa subregion The White and Yampa River Basins. Colorado, Utah, and Wyoming. 1406 Lower Green subregion The Green River Basin below the confluence with the Yampa River Basin, but excluding the Yampa and White River Basins. Colorado and Utah. 1407 Upper Colorado–Dirty Devil subregion The Colorado River Basin below the confluence with the Green River Basin to the Lee Ferry compact point, but excluding the San Juan River Basin. Arizona and Utah. 1408 San Juan subregion The San Juan River Basin. Arizona, Colorado, New Mexico, and Utah.
See also List of rivers in the United States
References