49     1401 The Colorado River Basin
49     1403 Upper Colorado-Dolores
49     1404 Great Divide-Upper Green
49     1405 The White and Yampa River Basins
49     1406 The Green River Basin
49     1407 Upper Colorado-Dirty Devil
49     1408 The San Juan River Basin
49     1501 Lower Colorado-Lake Mead
49     1601 The Bear River Basin
49     1602 The Great Salt Lake Basin
49     1603 The Escalante Desert and The Sevier Lake Clo
49     1704 The Snake River Basin