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Flathead River
| States | Montana |
| Length | 157.6 miles |
| Watershed Length* | 1,721 miles |
| Mouth | Clark Fork ⤏ Eastern Pacific Ocean |
| GNIS | 783518 |
Tributaries
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| Name | Distance from Mouth (miles) | Length (miles) | Watershed Length (miles) |
|---|---|---|---|
| Ashley Creek | 120 | 51 | 51 |
| Camas Creek | 11 | 17 | 17 |
| Crow Creek | 42 | 17 | 54 |
| Flathead River - Middle Fork | 158 | 88 | 235 |
| Flathead River - North Fork | 158 | 58 | 289 |
| Flathead River - South Fork | 148 | 100 | 296 |
| Jocko River | 26 | 34 | 80 |
| Little Bitterroot River | 46 | 79 | 99 |
| Mission Creek | 29 | 28 | 53 |
| Stillwater River | 127 | 78 | 223 |
| Swan River | 106 | 94 | 129 |
| White Earth Creek | 65 | 14 | 14 |
| Whitefish River | 127 | 25 | 25 |
* Note: Watershed is mostly rivers/streams 15+ miles in length.
Data from United States Geological Survey