About this river
Clark Fork is a 38.2 mile river near World Class Kayak Academy in Montana. Streamflow is measured at the USGS gauge Clark Fork at St. Regis MT (site 12354500). The National Hydrography Dataset places it at stream order 8. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1930 to 2026
Clark Fork typically runs highest in June, at a median 19,400 cfs, and lowest in January, at 2,740 cfs. The highest flow on record for any single day is 68,500 cfs, in 1997.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 2,740 | 2,300 to 3,510 | |
| February | 2,970 | 2,450 to 3,670 | |
| March | 3,650 | 2,980 to 4,510 | |
| April | 7,680 | 5,550 to 11,700 | |
| May | 16,700 | 13,100 to 26,100 | |
| June | 19,400 | 12,950 to 26,800 | |
| July | 6,170 | 4,040 to 8,770 | |
| August | 2,810 | 2,170 to 3,520 | |
| September | 2,755 | 2,155 to 3,410 | |
| October | 3,160 | 2,620 to 3,720 | |
| November | 3,280 | 2,840 to 3,975 | |
| December | 2,980 | 2,520 to 3,620 |
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 96 years of record. Statistics published by the US Geological Survey for Clark Fork at St. Regis MT (site 12354500). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
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Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Clark Fork'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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