| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Tumtum River | 49,468,772 | Marys River | 14,000 | 44.5883000000 | -123.5120000000 | Map | |||||
| Oak Creek (Marys River tributary) |  | 33,669,844 | Marys River | 6,000 | 44.5547222200 | -123.2780555600 | Map |