Region
California
3
Colorado
2
Colorado Springs
2
Idaho
2
Alaska
1
Arizona
1
Cajon Pass
1
Colorado River Watershed (Colo.-Mexico)
1
Livermore Valley
1
Michigan Basin (Mich. and Ont.)
1
Powder River Basin (Wyo. and Mont.)
1
Santa Clara County
1
Santa Cruz County
1
South Carolina
1
Taylor Mountains
1
Taylor Mountains (Alaska)
1