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 |
|---|---|---|---|---|
| upper Colorado River ( GrandRiver ) | Colorado River | 007 67,993km 2 26,252mi 2 | 003 57,680km 2 22,270mi 2 | A038 84.8% |
| San Juan River | Colorado River | 008 64,560km 2 24,927mi 2 | 008 15,175km 2 5,859mi 2 | A060 23.5% |
| South Platte River | Platte River | 009 62,738km 2 24,223mi 2 | 004 48,948km 2 18,899mi 2 | A040 78.0% |
| Smoky Hill River | Kansas River | 010 51,783km 2 19,994mi 2 | 040 2,493km 2 963mi 2 | A070 4.8% |
| Cimarron River | Arkansas River | 011 44,890km 2 17,332mi 2 | 016 5,481km 2 2,116mi 2 | A066 12.2% |
| Yampa River | Green River | 012 21,506km 2 8,304mi 2 | 007 15,289km 2 5,903mi 2 | A043 71.1% |