About this river
Bitterroot River is a 19.9 mile river near Love Boat Paddle Co. in Montana. Streamflow is measured at the USGS gauge Bitterroot River near Missoula MT (site 12352500). The National Hydrography Dataset places it at stream order 7. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1898 to 2026
Bitterroot River typically runs highest in June, at a median 6,850 cfs, and lowest in September, at 766 cfs. The highest flow on record for any single day is 37,400 cfs, in 1899.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 788 | 670 to 1,040 | |
| February | 822 | 686 to 1,020 | |
| March | 1,050 | 843 to 1,480 | |
| April | 2,470 | 1,615 to 3,585 | |
| May | 6,490 | 4,600 to 9,860 | |
| June | 6,850 | 4,740 to 9,175 | |
| July | 1,710 | 960 to 2,870 | |
| August | 768 | 594 to 983 | |
| September | 766 | 617 to 960 | |
| October | 850 | 690 to 1,100 | |
| November | 1,010 | 844 to 1,290 | |
| December | 900 | 718 to 1,090 |
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 42 years of record. Statistics published by the US Geological Survey for Bitterroot River near Missoula MT (site 12352500). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
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