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 |
|---|---|---|---|---|
| Purgatoire River | Arkansas River | 019 8,923km 2 3,445mi 2 | 013 8,601km 2 3,321mi 2 | A031 96.4% |
| Lodgepole Creek | South Platte River | 020 8,374km 2 3,233mi 2 | 069 496km 2 191mi 2 | A069 5.9% |
| Rio Chama | Rio Grande | 021 8,204km 2 3,168mi 2 | 071 238km 2 92mi 2 | A071 2.9% |
| San Luis Closed Basin | endorheic basin | 022 7,638km 2 2,949mi 2 | 014 7,638km 2 2,949mi 2 | A002 100% |
| Frenchman Creek | Republican River | 023 7,398km 2 2,856mi 2 | 036 2,539km 2 980mi 2 | A053 34.3% |
| South Fork Republican River | Republican River | 024 7,195km 2 2,778mi 2 | 017 5,454km 2 2,106mi 2 | A041 75.8% |