Region
Colorado River (Colo.-Mexico)
2
Hoover Dam (Ariz. and Nev.)
2
Arizona
1
Boulder City
1
Boulder City (Nev.)
1
Colorado
1
Colorado River Watershed (Colo.-Mexico)
1
Glen Canyon Dam (Ariz.)
1
Glen Canyon Region (Utah and Ariz.)
1
Green River (Utah)
1
Nevada
1
United States
1
Utah
1
West (U.S.)
1
Wyoming
1