About this river
South Fork Flathead River is a 9.8 mile river near Wild River Adventures in Montana. Streamflow is measured at the USGS gauge S F Flathead River nr Columbia Falls MT (site 12362500). The National Hydrography Dataset places it at stream order 6. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1911 to 2025
South Fork Flathead River typically runs highest in May, at a median 4,690 cfs, and lowest in August, at 1,520 cfs. The highest flow on record for any single day is 40,800 cfs, in 1948.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 2,400 | 841 to 5,170 | |
| February | 2,410 | 719 to 4,840 | |
| March | 1,860 | 650 to 4,250 | |
| April | 4,160 | 967 to 8,235 | |
| May | 4,690 | 1,310 to 9,560 | |
| June | 4,490 | 1,825 to 9,030 | |
| July | 2,910 | 1,750 to 4,620 | |
| August | 1,520 | 812 to 2,890 | |
| September | 1,850 | 613 to 3,050 | |
| October | 1,790 | 650 to 2,640 | |
| November | 1,730 | 743 to 2,585 | |
| December | 2,210 | 1,040 to 3,730 |
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 S F Flathead River nr Columbia Falls MT (site 12362500). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show South Fork Flathead River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
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