What is the current flow on South Fork Flathead River?

South Fork Flathead River was running 3,480 cubic feet per second as of Aug 1, 2026, 5:45 PM UTC, measured at USGS gauge 12362500. 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 South Fork Flathead River?

62.6°F (17°C) as of Aug 1, 2026, 5:45 PM UTC, at USGS gauge 12359800. South Fork 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.

South Fork Flathead River

Montana. Streamflow and water-temperature readings from USGS gauges. Running 3,480 cfs as of Aug 1, 2026, 5:45 PM UTC.

Latest Reading

3,480

cubic feet / second

62.6°F

water temperature (17°C)

USGS gauges

Flow measured Aug 1, 2026, 5:45 PM UTC at gauge 12362500. Temperature measured Aug 1, 2026, 5:45 PM UTC at gauge 12359800. These are build-time snapshots, not a live feed — check the USGS gauge before relying on them.

USGS Gauges on South Fork Flathead River

Gauge	Station	Water temp?
12359800	S F Flathead R ab Twin C nr Hungry Horse MT	Yes
12362500	S F Flathead River nr Columbia Falls MT	Yes

Fly fishing rivers →Montana trout water →Montana lakes →

Conditions: USGS NWIS (public domain).