Britannica
Sources used in this answer
Which states belong to the upper basin under the Colorado River Compact?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
Colorado River
Colorado River, near San Luis, Mex.
Under the 1922 Colorado River Compact, the river is divided at Lees Ferry, Arizona, into two groups of states. The states that constitute the upper basin are:
- Wyoming
- Utah
- Colorado
- New Mexico1