About this river
Clark Fork is a 19.0 mile river near Blackfoot River Outfitters in Montana. Streamflow is measured at the USGS gauge Clark Fork above Missoula MT (site 12340500). The National Hydrography Dataset places it at stream order 8. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1929 to 2025
Clark Fork typically runs highest in June, at a median 7,250 cfs, and lowest in January, at 1,250 cfs. The highest flow on record for any single day is 31,500 cfs, in 2018.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 1,250 | 1,000 to 1,540 | |
| February | 1,340 | 1,120 to 1,560 | |
| March | 1,580 | 1,360 to 2,040 | |
| April | 2,930 | 2,250 to 4,760 | |
| May | 6,900 | 5,050 to 10,600 | |
| June | 7,250 | 4,960 to 10,500 | |
| July | 2,560 | 1,780 to 3,790 | |
| August | 1,340 | 981 to 1,710 | |
| September | 1,335 | 1,030 to 1,670 | |
| October | 1,480 | 1,270 to 1,770 | |
| November | 1,510 | 1,320 to 1,760 | |
| December | 1,310 | 1,100 to 1,620 |
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 above Missoula MT (site 12340500). 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 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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