Region
Arizona
21
Black Mesa (Navajo County and Apache County)
5
Mohave County
2
Avra Valley
1
Beaver Dam Wash (Utah-Ariz.)
1
Black Mesa (Navajo County and Apache County, Ariz.)
1
Black Mesa Region (Navajo County and Apache County)
1
El Niño Current
1
Maricopa County
1
Oro, Cañada del (Ariz.)
1
Pima County
1
Salt River Valley (Gila County and Maricopa County)
1
San Carlos Indian Reservation
1
San Pedro River Watershed (Mexico and Ariz.)
1
San Simon Wash region
1
Tucson
1
Yavapai County
1
Yuma County
1