What is the current flow on Sun River?

Sun River was running 762 cubic feet per second as of Aug 1, 2026, 6:00 PM UTC, measured at USGS gauge 06089000. 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 Sun River?

73.4°F (23°C) as of Aug 1, 2026, 6:30 PM UTC, at USGS gauge 06085800. Sun 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.

Sun River

Montana. Streamflow and water-temperature readings from USGS gauges. Running 762 cfs as of Aug 1, 2026, 6:00 PM UTC.

Latest Reading

762

cubic feet / second

73.4°F

water temperature (23°C)

USGS gauges

Flow measured Aug 1, 2026, 6:00 PM UTC at gauge 06089000. Temperature measured Aug 1, 2026, 6:30 PM UTC at gauge 06085800. These are build-time snapshots, not a live feed — check the USGS gauge before relying on them.

USGS Gauges on Sun River

Gauge	Station	Water temp?
06080900	Sun River bl Diversion Dam nr Augusta MT	—
06082200	Sun River bl Willow Cr nr Augusta MT	—
06085800	Sun River at Simms MT	Yes
06089000	Sun River near Vaughn MT	—

Fly fishing rivers →Montana trout water →Montana lakes →

Conditions: USGS NWIS (public domain).