Region
Arizona
8
California
6
Gila River (N.M. and Ariz.)
6
Southern States
6
Potomac River
5
Colorado
4
Nevada
4
Middle West
3
Missouri
3
Alabama
2
Atlantic States
2
Bangor
2
Big Lost River Watershed
2
Big Thompson River Watershed
2
Black Hills (S.D. and Wyo.)
2
Cache la Poudre River Watershed
2
California, Southern
2
Cascade Lake Dam (Colo.)
2
Georgia
2
Gila River Watershed (N.M. and Ariz.)
2
Grand Canyon
2
Idaho
2
Kansas City Metropolitan Area
2
Lawn Lake Dam (Colo.)
2
Maine
2
Mississippi
2
Mississippi River
2
Montana
2
Ophir Creek Valley (Washoe County)
2
Pennsylvania
2
Potomac River Valley
2
Rapid City
2
Rapid City (S.D.)
2
Roaring River
2
Roaring River Valley
2
Rubicon River
2
South Dakota
2
Texas
2
Wyoming
2
Appalachian Region
1
Bangor (Me.)
1
Big Thompson River Watershed (Colo.)
1
Coffee Creek
1
Colorado River (Colo.-Mexico)
1
Eldorado Canyon
1
Johnstown (Cambria County)
1
Johnstown Region
1
Johnstown Region (Pa.)
1
Kansas
1
Lees Ferry Region
1
more ...