Mississippi River Pool Lock and Dam 26 water temperature
Mississippi River Pool Lock and Dam 26, Alton, Illinois · River
The current water temperature at Mississippi River Pool Lock and Dam 26 is 16.7 °C (as of November 5, 2026, source: USGS).
A river can change temperature within hours — snowmelt, rain or power-plant operations show up immediately. That is why the measured value counts here, not an estimate.
Measurement series & statistics
This measurement series includes 463 data points since September 7, 2026.
Lowest recorded value: 16.7 °C on November 5, 2026 · highest value: 29.3 °C on September 7, 2026.
In November, temperatures have ranged between 16.7 °C and 17.4 °C.
The current value is 0.4 °C below the November average of this series.
Nearby waters
Frequently asked questions
Can you swim at Mississippi River Pool Lock and Dam 26 right now?
The current water temperature is 16.7 °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?
Currently 16.7 °C (updated continuously).
How warm is at Mississippi River Pool Lock and Dam 26 in November?
In November, the water temperature recently averaged 17.1 °C.
When is the water warmest at Mississippi River Pool Lock and Dam 26?
Across the measurement record, September is on average the warmest month (25.2 °C).
