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. 

Quick Facts
Description Value (approximate)
Irrigated Acres (2010) 1                       199,230

             Irrigated Lands Graph

Decreed Points of Diversion 1 12,880
Decreed Wells 1 5,050
Major Reservoirs 2
  • Granby Reservoir
  • Dillon Reservoir
  • Green Mountain Reservoir
Normal Storage (acre-feet)
  • 539,800
  • 254,036
  • 154,600
Major Imports into Basin 2

None
Major Exports from Basin 2
  • Adams Tunnel
  • Roberts Tunnel
  • Moffat Tunnel
Average Annual Diversion (acre-feet)
  • 218,142
  • 53,676
  • 52,155

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


Compact Facts
  • Colorado River Compact of 1922:  The Colorado River Compact allocates 7.5 million acre-feet (AF) of consumptive use annually to:
    1. the Upper Colorado River Basin (those parts of Arizona, Colorado, New Mexico, Utah, and Wyoming above Lee Ferry, Arizona), and
    2. 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%


        Colorado River Basin

Basin Updates
  • No updates at this time


 Additional Information