Bitterroot River

Last Updated: May 3, 2026

Total streamflow across the Bitterroot River was last observed at 7,810 cfs, and is expected to yield approximately 15,491 acre-ft of water today; about 75% of normal. Average streamflow for this time of year is 10,405 cfs, with recent peaks last observed on 2018-05-11 when daily discharge volume was observed at 42,770 cfs.

Maximum discharge along the river is currently at the Bitterroot River Near Missoula Mt reporting a streamflow rate of 3,630 cfs. However, the streamgauge with the highest stage along the river is the Bitterroot River At Bell Crossing Nr Victor Mt with a gauge stage of 7.11 ft. This river is monitored from 3 different streamgauging stations along the Bitterroot River, the highest being situated at an altitude of 3,955 ft, the Bitterroot River Near Darby Mt.

The Bitterroot River is a 84-mile-long river in western Montana, USA.


15-Day Long Term Forecast


River Details

Last Updated 2026-05-03
Discharge Volume 15,491 ACRE-FT
Streamflow 7,810.0 cfs
Past 24 Hours: +570.0 cfs (+7.87%)
Percent of Normal 75.06%
Maximum 42,770.0 cfs
2018-05-11
Seasonal Avg 10,405 cfs
       
River Streamflow Levels
Streamgauge Streamflow Gauge Stage 24hr Change (%) % Normal Minimum (cfs) Maximum (cfs) Air Temp Elevation
Bitterroot River Near Darby Mt
USGS 12344000
1690 cfs 3.86 ft 9.74
Bitterroot River At Bell Crossing Nr Victor Mt
USGS 12350250
2490 cfs 7.11 ft 9.21
Bitterroot River Near Missoula Mt
USGS 12352500
3630 cfs 5.57 ft 6.14
Seasonal Discharge Comparison
Maximum Streamflow Discharge
Streamflow Elevation Profile

The Bitterroot River is a northward flowing 84-mile (135 km) river running through the Bitterroot Valley, from the confluence of its West and East forks near Conner in southern Ravalli County to its confluence with the Clark Fork River near Missoula in Missoula County, in western Montana. The Clark Fork River is tributary to the Columbia River and ultimately, the Pacific Ocean. The Bitterroot River is a Blue Ribbon trout fishery with a healthy population of native westslope cutthroat trout and bull trout. It is the third most fly fished river in Montana behind the Madison and Big Horn Rivers.