Mississippi River Pool Lock and Dam 26 at Alton, Illinois water temperature

Mississippi River Pool Lock and Dam 26 at Alton, Illinois · River

The current water temperature at Mississippi River Pool Lock and Dam 26 at Alton is 26.7 °C (as of August 26, 2026, source: USGS).

26.7 °C

Measured: August 26, 2026 · continuously updated

Nearby waters

Missouri River near Labadie, Missouri · 67.1 km away27.9 °C Illinois River at Florence, Illinois · 90.6 km away25.8 °C Sugar Creek near Chatham, Illinois · 97.0 km away24.6 °C Lick Creek near Woodside, Illinois · 101.0 km away22.3 °C Big River below Bonne Terre, Missouri · 108.0 km away28.6 °C

Frequently asked questions

Can you swim at Mississippi River Pool Lock and Dam 26 at Alton right now?
The current water temperature is 26.7 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Mississippi River Pool Lock and Dam 26 at Alton?
Currently 26.7 °C (updated continuously).