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 |
|---|---|---|---|---|
| Sand Arroyo Creek | North Fork Cimarron River | 062 1,938km 2 748mi 2 | 057 1,314km 2 507mi 2 | A045 67.8% |
| Chico Creek | Arkansas River | 063 1,934km 2 747mi 2 | 048 1,934km 2 747mi 2 | A022 100% |
| Kiowa Creek | South Platte River | 064 1,888km 2 729mi 2 | 049 1,888km 2 729mi 2 | A023 100% |
| Pawnee Creek | South Platte River | 065 1,875km 2 724mi 2 | 050 1,875km 2 724mi 2 | A024 100% |
| McElmo Creek | San Juan River | 066 1,842km 2 711mi 2 | 053 1,654km 2 639mi 2 | A035 89.8% |
| Blue River | upper Colorado River ( GrandRiver ) | 067 1,770km 2 683mi 2 | 051 1,770km 2 683mi 2 | A025 100% |