What is the current flow on Illinois River?

Illinois River was running 13,500 cubic feet per second as of Aug 1, 2026, 5:45 PM UTC, measured at USGS gauge 05568500. 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 Illinois River?

76.8°F (24.9°C) as of Aug 1, 2026, 5:45 PM UTC, at USGS gauge 05558300. Illinois 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.

Illinois River

Illinois. Streamflow and water-temperature readings from USGS gauges. Running 13,500 cfs as of Aug 1, 2026, 5:45 PM UTC.

Latest Reading

13,500

cubic feet / second

76.8°F

water temperature (24.9°C)

USGS gauges

Flow measured Aug 1, 2026, 5:45 PM UTC at gauge 05568500. Temperature measured Aug 1, 2026, 5:45 PM UTC at gauge 05558300. These are build-time snapshots, not a live feed — check the USGS gauge before relying on them.

USGS Gauges on Illinois River

Gauge	Station	Water temp?
05542500	ILLINOIS RIVER AT MORRIS, IL	—
05543500	ILLINOIS RIVER AT MARSEILLES, IL	—
05558300	ILLINOIS RIVER AT HENRY, IL	Yes
05568500	ILLINOIS RIVER AT KINGSTON MINES, IL	—
05585500	ILLINOIS RIVER AT MEREDOSIA, IL	—
05586100	ILLINOIS RIVER AT VALLEY CITY, IL	—

Fly fishing rivers →Illinois lakes →

Conditions: USGS NWIS (public domain).