| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Birch Creek (Umatilla River tributary) |  | 753,686,528 | Umatilla River | 26,000 | 45.6553000000 | -118.8820000000 | Map | ||||
| Butter Creek (Oregon) | 1,204,344,448 | Umatilla River | 92,000 | 45.7947000000 | -119.3290000000 | Map | |||||
| North Fork Umatilla River |  | Umatilla River | 45.7255555600 | -118.1886111100 | Map | ||||||
| South Fork Umatilla River | Umatilla River | 45.7255555600 | -118.1883333300 | Map |