Region
Alaska
1
Allegheny National Wild and Scenic River (Pa.)
1
Arizona
54
Big Thompson River (Colo.)
1
Boulder City
2
Boulder City (Nev.)
2
California
20
California, Southern
2
Colorado
7
Colorado Plateau
1
Colorado River
21
Colorado River (Colo.-Mexico)
177
Colorado River (Tex.)
1
Colorado River Delta (Mexico)
3
Colorado River Region (Colo.-Mexico)
1
Colorado River Valley
1
Colorado River Valley (Colo.-Mexico)
8
Colorado River Watershed
1
Colorado River Watershed (Colo.-Mexico)
12
Columbia River Watershed
1
Dinosaur National Monument (Colo. and Utah)
1
Echo Park Dam (Colo.)
1
Four Corners Region
3
Glen Canyon
1
Glen Canyon (Utah and Ariz.)
4
Glen Canyon Dam
4
Glen Canyon Dam (Ariz.)
12
Grand Canyon
15
Grand Canyon (Ariz.)
23
Grand Canyon National Park
5
Grand Canyon National Park (Ariz.)
1
Grand Junction
1
Grand canyon (Ariz.)
1
Great Basin
2
Green River (Wyo.-Utah)
2
Green River Watershed (Wyo.-Utah)
1
Gunnison River
1
Hoover Dam (Ariz. and Nev.)
19
Marble Canyon (Coconino County : Canyon)
2
Marble Canyon (Coconino County, Ariz. : Canyon)
1
Mexican-American Border Region
1
Mexico
4
Mexico, North
1
Nevada
5
North America
23
Pacific Coast (U.S.)
1
Page (Ariz.)
1
Powell, Lake (Utah and Ariz.)
1
Rio Grande (Colo.-Mexico and Tex.)
7
Salton Sea
1
more ...