| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Arikaree River |  | 4,514,349,056 | Republican River | 251,000 | 40.0203000000 | -101.9380000000 | Map | ||||
| North Fork Republican River |  | 13,172,678,656 | Republican River | 89,000 | 40.0197000000 | -101.9380000000 | Map | ||||
| Red Willow Creek | 2,027,960,576 | Republican River | 40.2225000000 | -100.4870000000 | Map | ||||||
| South Fork Republican River |  | 7,194,986,496 | Republican River | 275,000 | 40.0483000000 | -101.5180000000 | Map | ||||
| Frenchman Creek (Republican River tributary) |  | Republican River | 267,000 | 40.2247000000 | -100.8270000000 | Map |