What is the current flow on Flathead River?

Flathead River was running 7,630 cubic feet per second as of Aug 1, 2026, 5:30 PM UTC, measured at USGS gauge 12388700. This is a build-time snapshot rather than a live reading — check the USGS gauge directly before relying on it.

What is the water temperature on Flathead River?

75.7°F (24.3°C) as of Aug 1, 2026, 5:45 PM UTC, at USGS gauge 12372000. Flathead River carries no state trout classification, so the trout-stress thresholds do not apply to it — this is a water temperature measurement, not a fishery judgement.

Flathead River

Montana. Streamflow and water-temperature readings from USGS gauges. Running 7,630 cfs as of Aug 1, 2026, 5:30 PM UTC.

Latest Reading

7,630

cubic feet / second

75.7°F

water temperature (24.3°C)

USGS gauges

Flow measured Aug 1, 2026, 5:30 PM UTC at gauge 12388700. Temperature measured Aug 1, 2026, 5:45 PM UTC at gauge 12372000. These are build-time snapshots, not a live feed — check the USGS gauge before relying on them.

USGS Gauges on Flathead River

Gauge	Station	Water temp?
12363000	Flathead River at Columbia Falls MT	Yes
12372000	Flathead River near Polson MT	Yes
12388700	Flathead River at Perma MT	Yes

Fly fishing rivers →Montana trout water →Montana lakes →

Conditions: USGS NWIS (public domain).