Colorado River Basin
The Colorado Basin encompasses approximately 9,830 square miles (9.4 percent of the area of Colorado) in the northwest portion of the state. Major tributaries include Fraser River, Blue River, and Roaring Fork River.
1 Source: CDSS, total values derived from GIS Data for Colorado Basin
2 Source: Statewide Water Supply Initiative Fact Sheet for Colorado Basin,CWCB, 2006
- Colorado River Compact of 1922: The Colorado River Compact allocates 7.5 million acre-feet (AF) of consumptive use annually to:
- the Upper Colorado River Basin (those parts of Arizona, Colorado, New Mexico, Utah, and Wyoming above Lee Ferry, Arizona), and
- the Lower Colorado River Basin (those parts of Arizona, California and Nevada below Lee Ferry, Arizona).
- Upper Colorado River Basin Compact of 1948: The Upper Colorado River Basin Compact allocates the 7.5 million AF apportionment of consumptive uses available to the Upper Basin as follows:
- Arizona – 50,000 AF/year
- Colorado – 51.75%
- Utah – 23%
- Wyoming – 14% New
- Mexico – 11.25%