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Region
- Colorado[remove]88
- United States32
- Utah5
- Wyoming4
- Nevada3
- Washington (State)3
- Chippewa-Cree Indians of the Rocky Boy's Reservation, Montana2
- Green River Formation2
- Montana2
- Animas River Watershed (Colo. and N.M.)1
- Arizona1
- Chimney Rock Region (Archuleta County, Colo.)1
- Colorado River Watershed (Colo.-Mexico)1
- ColoradoChimney Rock Region (Archuleta County)1
- ColoradoDenver1
- El Paso County (Colo.)1
- Gold King Mine (San Juan County, Colo.)1
- Kansas1
- Kansas River Watershed (Kan.)1
- KansasKansas River Watershed1