Region
Arizona
3
Black Mesa (Navajo County and Apache County)
3
United States
3
Maryland
2
North Carolina
2
California
1
Chesapeake Bay Watershed
1
Chincoteague Watershed
1
Delaware River Watershed (N.Y.-Del. and N.J.)
1
Durham County
1
Florida
1
Fort Gordon
1
Fort Gordon (Ga.)
1
Georgia
1
Idaho
1
Kansas
1
Koocanusa, Lake (B.C. and Mont.)
1
Kootenai River
1
Little Arkansas River
1
Loch Vale Watershed (Colo.)
1
Maine
1
Miami-Dade County
1
Northeast Creek
1
Northeastern States
1
Powell, Lake (Utah and Ariz.)
1
Research Triangle
1
San Joaquin Valley
1
Virginia
1
Washington (D.C.)
1
Washington (State)
1
Wisconsin
1