| South Fork Republican River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Colorado, Kansas, Nebraska |
| Length: | 171miles |
| Discharge1 Location: | USGS 06827500 near Benkelman, NE[1] |
| Discharge1 Min: | 0cuft/s |
| Discharge1 Avg: | 35.1cuft/s |
| Discharge1 Max: | 6220cuft/s |
| Source1 Location: | Lincoln County, Colorado |
| Source1 Coordinates: | 39.2147°N -103.3372°W |
| Source1 Elevation: | 5384feet |
| Mouth: | Republican River |
| Mouth Location: | Benkelman, Nebraska |
| Mouth Coordinates: | 40.0417°N -101.5214°W |
| Mouth Elevation: | 2969feet |
| Basin Size: | 2778sqmi |
| Custom Label: | Watersheds |
| Custom Data: | South Fork Republican- Republican-Kansas-Missouri- Mississippi |
The South Fork Republican River is a river that arises in Lincoln County, Colorado, United States, and flows east-northeastward for about [2] through Kit Carson and Yuma Counties, Colorado, and Cheyenne County, Kansas, to a confluence with the Republican River in Dundy County, Nebraska. Bonny Reservoir is located on the South Fork Republican River in Yuma County, Colorado.
The South Fork Republican River drains an area of, including, or 75.8%, in eastern Colorado,, or 24.0%, in northwestern Kansas, and, or 0.2%, in southwestern Nebraska.[3]
Use of water from the South Fork Republican River is governed by the Republican River Compact, a water agreement among the U.S. states of Colorado, Kansas Nebraska signed on 12-31-1942