Region
Colorado
7
Pennsylvania
4
Coeur d'Alene River
2
Idaho
2
West (U.S.)
2
Animas River Watershed (Colo. and N.M.)
1
Bear Creek (Dauphin County)
1
Bear Creek (Dauphin County, Pa.)
1
Boulder River Watershed (Jefferson County)
1
Cambria County
1
Clear Creek (Clear Creek County)
1
Georgetown
1
Gold King Mine (San Juan County)
1
Gold King Mine (San Juan County, Colo.)
1
Humboldt River Watershed
1
Illinois
1
Johnson County
1
Kentucky
1
Lebanon County
1
Martin County
1
Missouri
1
Montana
1
Nevada
1
Pacific and Mountain States
1
Piceance Creek Region
1
Piceance Creek Watershed
1
Schuylkill County
1
Swatara State Park
1
United States
1
Viburnum Trend
1