It forms southwest of Alpine and flows southwest then northwest to meet the White River west of Fort Apache .
The Black River is a 114 - mile - long ( 183 km ) river in the White Mountains of the U.S. state of Arizona .
Black River forms southwest of Alpine and flows southwest then northwest to meet the White River west of Fort Apache .
The Black River is a 114 - mile - long ( 183 km ) river in the White Mountains of the U.S. state of Arizona .