Sun River near Vaughn MT

Steady over 24 hours (−1.8% discharge). Rising or falling means a change of more than 10% in discharge (or 0.2 ft of gauge height) over 24 hours; our rule of thumb, not a USGS class.

• Below NWS action stage. The National Weather Service reports this gauge below its action stage. That is not a statement that wading is safe.

  Flood categories: action stage, minor, moderate and major flooding (National Weather Service)

• Flow far above normal. Above the 90th percentile of daily mean flow for this date (USGS class “much above normal”), from 92 years of record. Expect higher, faster water than usual for the season.

  hyswap: flow categories (WDFN_stats schema) (U.S. Geological Survey) Statistics documentation (percentiles of daily mean discharge) (U.S. Geological Survey)

• Turn Around Don't Drown. “A mere 6 inches of fast-moving flood water can knock over an adult.” No flow number makes a crossing safe; if in doubt, stay out.

  Turn Around Don't Drown (National Weather Service)

Guidance from the readings above and the published thresholds named with each line; not a fishing forecast, a safety guarantee or a statement about access. Local rules and closures come first.

This gauge is on Sun River: regulations, guides and shops

USGS gauge page USGS statistics NWS gauge VAUM8

Checked Nov 5, 8:15 PM MST; readings refresh at most every 15 minutes and statistics daily. Provisional USGS data can be revised. Conditions change: re-check before you go. This is general guidance, not a fishing forecast, a safety guarantee or a statement about access.