| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Five Rivers (Oregon) |  | 308,208,576 | Alsea River | 44.3583333300 | -123.8269444400 | Map | |||||
| Red River (Oregon) | Alsea River | 44.4281000000 | -124.0660000000 | Map | |||||||
| North Fork Alsea River |  | Alsea River | 26,000 | 44.3761111100 | -123.6027777800 | Map | |||||
| South Fork Alsea River | Alsea River | 44.3761111100 | -123.6025000000 | Map | |||||||
| Southworth Creek | Alsea River | 5,000 | 44.4125000000 | -123.9875000000 | Map |