Colorado drainage basins Table of major drainage basins Major Drainage Basins of the State of Colorado

| Basin | Outlet | Total_Area | In_State_Area | _In_State |
|---|---|---|---|---|
| Gunnison River | upper Colorado River ( GrandRiver ) | 013 20,851km 2 8,051mi 2 | 006 20,851km 2 8,051mi 2 | A001 100% |
| North Fork Republican River | Republican River | 014 13,172km 2 5,086mi 2 | 010 11,522km 2 4,449mi 2 | A037 87.5% |
| White River | Green River | 015 12,989km 2 5,015mi 2 | 012 9,796km 2 3,782mi 2 | A042 75.4% |
| Dolores River | upper Colorado River ( GrandRiver ) | 016 11,998km 2 4,633mi 2 | 011 10,619km 2 4,100mi 2 | A036 88.5% |
| Laramie River | North Platte River | 017 11,961km 2 4,618mi 2 | 061 989km 2 382mi 2 | A067 8.3% |
| Little Snake River | Yampa River | 018 10,629km 2 4,104mi 2 | 022 4,412km 2 1,704mi 2 | A052 41.5% |