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Elev 689 ft, 41.63 °N, 88.68 °W

Somonauk, IL Severe Weather Alertstar_ratehome

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Personal Weather Station
Location: Somonauk, IL
Elevation: 689ft
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River Flood Warning
Issued: 3:31 PM Apr. 23, 2026 – National Weather Service
...FLOOD WARNING NOW IN EFFECT UNTIL FRIDAY AFTERNOON...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Illinois River from Starved Rock Lock and Dam downstream
to confluence with Big Bureau Creek, including the La Salle gauge.

* WHEN...Until Friday afternoon.

* IMPACTS...At 20.0 feet, Agricultural areas in La Salle, Spring
Valley, and Peru are inundated.

* ADDITIONAL DETAILS...
- At 9:45 AM CDT Thursday the stage was 20.1 feet.
- Forecast...The river is expected to fluctuate around flood
stage of 20.0 feet through tonight, then slowly fall below
flood stage on Friday.
- Flood stage is 20.0 feet.
- http://www.weather.gov/safety/flood

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