Region
Colorado River (Colo.-Mexico)
37
Arizona
11
Colorado
10
Grand Canyon National Park
4
California
3
Grand Canyon
3
Colorado River Watershed (Colo.-Mexico)
2
Grand Canyon (Ariz.)
2
West (U.S.)
2
Colorado River Valley (Colo.-Mexico)
1
Glen Canyon Dam
1
Grand Canyon National Park Region
1
Gunnison River
1
Lava Falls Rapids (Ariz.)
1
Lees Ferry Region
1
Missouri River
1
Palisade
1
San Juan River (Colo.-Utah)
1
Southwest, New
1
United States
1
Utah
1
Wyoming
1