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 |
|---|---|---|---|---|
| Horse Creek | Arkansas River | 037 3,680km 2 1,421mi 2 | 026 3,680km 2 1,421mi 2 | A008 100% |
| Ladder Creek | Smoky Hill River | 038 3,645km 2 1,407mi 2 | 067 663km 2 256mi 2 | A062 18.2% |
| Bijou Creek | South Platte River | 039 3,612km 2 1,395mi 2 | 027 3,612km 2 1,395mi 2 | A009 100% |
| White Woman Basin | endorheic basin | 040 3,577km 2 1,381mi 2 | 065 908km 2 351mi 2 | A057 25.4% |
| Rush Creek | Arkansas River | 041 3,570km 2 1,378mi 2 | 028 3,570km 2 1,378mi 2 | A010 100% |
| Animas River | San Juan River | 042 3,562km 2 1,375mi 2 | 030 2,971km 2 1,147mi 2 | A039 83.4% |