Region
Colorado
13
Nevada
12
Utah
8
Wyoming
8
Idaho
6
Arizona
5
New Mexico
4
Uncompahgre River Watershed
4
Montana
3
California
2
El Malpais National Monument (N.M.)
2
United States
2
West (U.S.)
2
Beaverhead County
1
Centennial Mountains (Idaho and Mont.)
1
Clark County
1
Esmeralda County
1
Grand Junction region
1
Grand Wash Cliffs Wilderness
1
Grand Wash Cliffs Wilderness (Ariz.)
1
Madison County
1
Mohave County
1
Nye County
1
Oregon
1
Upper Sonoran Region
1
Washington County
1
Yuma Region
1