About this river
Clark Fork is a 40.9 mile river near Coeur d' Alene Adventures in Montana. Streamflow is measured at the USGS gauge Clark Fork near Plains MT (site 12389000). The National Hydrography Dataset places it at stream order 8. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1911 to 2026
Clark Fork typically runs highest in June, at a median 49,250 cfs, and lowest in September, at 8,900 cfs. The highest flow on record for any single day is 133,000 cfs, in 1948.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 12,200 | 8,270 to 15,400 | |
| February | 11,500 | 8,000 to 15,200 | |
| March | 11,000 | 7,860 to 14,800 | |
| April | 16,400 | 12,000 to 23,350 | |
| May | 40,200 | 29,300 to 54,300 | |
| June | 49,250 | 36,300 to 70,150 | |
| July | 21,200 | 15,100 to 29,500 | |
| August | 9,800 | 7,890 to 12,400 | |
| September | 8,900 | 7,065 to 11,050 | |
| October | 9,840 | 7,640 to 12,300 | |
| November | 11,050 | 8,310 to 14,200 | |
| December | 12,100 | 8,560 to 15,700 |
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 115 years of record. Statistics published by the US Geological Survey for Clark Fork near Plains MT (site 12389000). 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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