Region
Colorado
72
United States
57
California
10
Texas
10
Washington (State)
6
Middle West
5
Ohio
5
Oklahoma
5
Pennsylvania
5
Great Lakes (North America)
4
Louisiana
4
Michigan
4
New Jersey
4
Alaska
3
Clear Creek Watershed (Clear Creek County, Colo.)
3
Colorado River (Colo.-Mexico)
3
Colorado River Watershed (Colo.-Mexico)
3
Crested Butte
3
East (U.S.)
3
Florida
3
Fort Worth
3
Gunnison County
3
Idaho
3
Indiana
3
Massachusetts
3
Nevada
3
New York (State)
3
South Dakota
3
Southern States
3
Standley Lake (Colo.)
3
Utah
3
West (U.S.)
3
Wisconsin
3
Animas River Watershed (Colo. and N.M.)
2
Big Sioux River (S.D. and Iowa)
2
Brandywine Creek Watershed (Pa. and Del.)
2
Chesapeake Bay (Md. and Va.)
2
Chesapeake Bay Watershed
2
Chester County
2
Denver Metropolitan Area
2
Fort Polk
2
Ganges River (India and Bangladesh)
2
Great Plains
2
Hancock County
2
Hawaii
2
Humboldt River Watershed
2
Iowa
2
Johnson County
2
Kansas
2
Maryland
2
more ...