4     1407 Upper Colorado-Dirty Devil
 4     1408 The San Juan River Basin
 4     1501 Lower Colorado-Lake Mead
 4     1502 The Little Colorado River Basin
 4     1503 Lower Colorado
 4     1504 The Gila River Basin
 4     1505 The Gila River Basin
 4     1506 The Salt River Basin
 4     1507 The Gila River Basin
 4     1508 Sonora