Region
Arizona
12
Black Mesa (Navajo County and Apache County)
5
Oklahoma
4
Washington (State)
4
California
3
Nevada
3
Riverside County
3
Black Mesa Region (Navajo County and Apache County)
2
Columbia River
2
Montana
2
New Mexico
2
Osage Reservation
2
Pine Ridge Region
2
Salt River Indian Reservation
2
South Dakota
2
Stevens County
2
Uintah and Ouray Indian Reservation
2
Utah
2
Arikaree Formation
1
Black Mesa (Navajo County and Apache County, Ariz.)
1
Blue Creek (Stevens County)
1
Blue Creek (Stevens County, Wash.)
1
Caddo County
1
Cahuilla Reservation
1
Chuska Mountains (Ariz. and N.M.)
1
Colorado River (Colo.-Mexico)
1
Crow Indian Reservation
1
Gila River Watershed (N.M. and Ariz.)
1
Maine
1
Navajo Indian Reservation
1
Osage County
1
Penobscot River
1
Prickly Pear Creek Valley
1
San Juan County
1
San Juan River (Colo.-Utah)
1
San Simon Wash region
1
Stillwater National Wildlife Refuge (Nev.)
1
Tuba City
1