Illinois, Missouri Flood Warning | Effective 04/20/2026 19:30

Headline: 
Flood Warning issued April 20 at 9:30PM CDT by NWS St Louis MO
Event: 
Flood Warning
Urgency: 
Immediate
Effective: 
April 20, 2026 - 7:30pm
Expires: 
April 22, 2026 - 7:30am
Description: 
...The Flood Warning is extended for the following rivers in Illinois...Missouri... Mississippi River at Chester. ...The Flood Warning continues for the following rivers in Illinois...Missouri... Mississippi River at Grafton. Mississippi River at Canton. Mississippi River at Saverton. Mississippi River at Winfield. Mississippi River at Hannibal. Mississippi River at Clarksville. Mississippi River at Louisiana. ...The Flood Warning is cancelled for the following rivers in Illinois...Missouri... Mississippi River at Lock & Dam 21. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Clarksville. * WHEN...Until further notice. * IMPACTS...At 29.0 feet, Water enters the parking lot entrance at the Clarksville Riverfront Park. * ADDITIONAL DETAILS... - At 9:00 PM CDT Monday the stage was 28.4 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 9:00 PM CDT Monday was 28.4 feet. - Forecast...The river is expected to fall to 27.0 feet Monday, April 27. - Flood stage is 25.0 feet.
Instruction: 
Motorists should not attempt to drive around barricades or drive cars through flooded areas. This product, along with additional weather and stream information, is available at https://water.noaa.gov/wfo/lsx
Area Description: 
Calhoun, IL; Pike, MO
Forcast Office: 
NWS St Louis MO