About this river
Swan River is a 5.9 mile river near Base Camp Bigfork in Montana. Streamflow is measured at the USGS gauge Swan River near Bigfork, MT (site 12370000). The National Hydrography Dataset places it at stream order 6. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1922 to 2025
Swan River typically runs highest in June, at a median 3,125 cfs, and lowest in February, at 432 cfs. The highest flow on record for any single day is 8,800 cfs, in 1974.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 449 | 381 to 556 | |
| February | 432 | 364 to 565 | |
| March | 517 | 413 to 703 | |
| April | 1,365 | 956 to 1,935 | |
| May | 2,590 | 1,870 to 3,320 | |
| June | 3,125 | 2,380 to 4,080 | |
| July | 1,480 | 970 to 1,990 | |
| August | 634 | 492 to 801 | |
| September | 476 | 399 to 583 | |
| October | 500 | 393 to 590 | |
| November | 540 | 437 to 678 | |
| December | 477 | 409 to 583 |
Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 103 years of record. Statistics published by the US Geological Survey for Swan River near Bigfork, MT (site 12370000). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Boat access nearby
One mapped launch sits in the mapped area of Swan River. Ramp data comes from the USGS national boat-ramp inventory.
- BigforkFlathead LakePublic
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