| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Flathead River |  | 22,778,943,488 | 951 | Clark Fork River | 386,000 | 48.4672222222 | -114.0694444444 | Map | |||
| Thompson River (Montana) | Clark Fork River | 70,000 | 47.5769000000 | -115.2400000000 | Map | ||||||
| Bitterroot River |  | 7,288,226,304 | Clark Fork River | 75,000 | 45.9400000000 | -114.1272222222 | Map | ||||
| Little Blackfoot River |  | 1,069,665,024 | Clark Fork River | 77,000 | 46.3627777800 | -112.4919444400 | Map | ||||
| Blackfoot River (Montana) |  | Clark Fork River | 120,000 | 46.8714000000 | -113.8880000000 | Map |