| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Middle Fork Flathead River |  | 3,004,386,048 | Flathead river | 148,000 | 47.9963888889 | -113.5008333333 | Map | ||||
| South Fork Flathead River |  | 924,000,000 | Flathead river | 158,000 | 47.4455555556 | -113.1836111111 | Map | ||||
| North Fork Flathead River |  | 4,040,381,184 | Flathead river | 246,000 | 49.3322222222 | -114.8525000000 | Map |