Swan River in Montana
Around here
Around Swan River
Before you go
Data Source: Recreation.gov · Public land: USGS PAD-US
About this river
Swan River is a 62.1 mile river. 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.
Show the numbers
| Month | Typical (cfs) | Usual range (cfs) |
|---|---|---|
| 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
8 mapped launches sit in the mapped area of Swan River. Ramp data comes from the USGS national boat-ramp inventory.
- Blue BayFlathead LakePublic
- Flathead Lake State Park-Yellow BayFlathead LakePublic
- Geri LaneSwan LakePublic
- Swan LakeSwan LakePublic
- Woods BayFlathead LakePublic
- Hidden Harbor MarinaFlathead LakeRestricted
- Horseshoe Lake/FerndaleHorseshoe LakePublic
- Loon Lake/FerndaleLoon LakePublic
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Swan River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
See every free widget you can put on your site, including live conditions and a 7 day forecast.
