Rivermatics

3 USGS Streamgages · Columbia River system

Bitterroot River flows and levels

Bitterroot River is gauged at 3 USGS streamgages in Montana, each tracked by Rivermatics. The mainstem runs about 126 miles (203 km) from headwaters to outlet. It drains into the Columbia River system. Drainage area at the gauges ranges from 1,050 square miles at Bitterroot River near Darby, MT up to 2,824 at Bitterroot River near Missoula, MT. The gauged reach falls about 831 feet, from 3,951 feet down to 3,120. Rivermatics issues a daily machine-learned 14-day flow outlook for every one of them.

Gauges on this river, upstream to downstream

Ordered by drainage area, which is how far down the river each gauge sits. April and July figures are long-term median daily flows for that month from the USGS record — historical normals, not a forecast and not today's reading.

USGS streamgages on this river, ordered upstream to downstream
Gauge State Drainage sq mi Elevation ft April p50 cfs July p50 cfs Forecast
Bitterroot River near Darby, MT MT 1,050 3,951 866.1 867.2 14-day
Bitterroot River at Bell Crossing near Victor, MT MT 1,944 3,327 1,686.8 934.5 14-day
Bitterroot River near Missoula, MT MT 2,824 3,120 2,494 2,094.4 14-day

Typical flow by month at Bitterroot River near Missoula, MT

The furthest-downstream gauge on this river, so the fullest flow it carries here. Long-term daily discharge percentiles from the USGS record (up to 127 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

Historical monthly discharge percentiles in cubic feet per second
Month Low p10 Typical p50 High p90 Range
January 564.4 781.1 1,315.2
February 578.3 822.4 1,677.6
March 734.3 1,112.5 2,237.4
April 1,176.2 2,494 4,804.3
May 3,234.5 6,165.2 12,578.1
June 3,632.3 7,268 13,771.3
July 874.9 2,094.4 4,712.6
August 527.8 785.8 1,292.3
September 525 773.2 1,186
October 611.6 878.9 1,450.3
November 699.9 1,014.1 1,681.7
December 579.5 878.8 1,425.5

All values in cubic feet per second (cfs).

Common questions

When does the Bitterroot River run highest?
June, on the long-term record at Bitterroot River near Missoula, MT — the furthest-downstream gauge Rivermatics tracks on this river. Median daily flow there is about 7,268 cfs that month, against 773.2 cfs in September, the lowest. Upstream gauges peak on their own schedule; the table on this page gives April and July for each.
How many gauges are on the Bitterroot River?
Rivermatics tracks 3 USGS streamgages on the Bitterroot River, across Montana. Each has its own page with the site's full flow record and monthly normals. The river may carry other gauges that publish neither daily values nor discharge statistics; those are not tracked here.
Is there a flow forecast for the Bitterroot River?
Yes, at 3 of the 3 gauges. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on each basin's observed flows, weather and snowpack, and issues a daily outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. Every forecast is scored against days the model never trained on, and that track record is published on each gauge's live screen.
What river system is the Bitterroot River part of?
The Bitterroot River drains into the Columbia River system — it is a tributary somewhere in that chain, following the flowpath down to its terminal river. Rivermatics builds this from the USGS/geoconnex reference-mainstem network rather than from names.
Can I use Bitterroot River data for flood or safety decisions?
No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.

Other rivers in the Columbia River system

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