Flood Warning — Mason County, Illinois
Flooding is occurring or imminent along rivers, streams, or low-lying areas.
Current Status
🌊 Active: Flood Warning
Flood Warning issued August 15 at 10:11AM CDT by NWS Lincoln IL
...The National Weather Service in Lincoln IL has issued a Flood Warning for the following rivers in Illinois... Illinois River near Havana affecting Fulton, Cass and Mason Counties. .The following forecasts are based on observed precipitation, soil moisture conditions, and forecast precipitation. * WHAT...Moderate flooding is forecast. * WHERE...Illinois River near Havana. * WHEN...From late tonight until further notice. * ADDITIONAL DETAILS... - At 9:45 AM CDT Saturday the stage was 12.6 feet. - Forecast...The river is expected to rise above flood stage late tonight and continue rising to 17.3 feet Saturday, August 22. Additional rises are possible thereafter. - Flood stage is 14.0 feet. - http://www.weather.gov/safety/flood
Effective August 15, 2026 at 11:11 AM ET · Expires August 16, 2026 at 3:15 AM ET
Event Details
Event Type
Flood Warning
Severity
severe
Issued By
NWS Lincoln IL
Expires
August 16, 2026 at 3:15 AM ET
Last Checked
1 minute ago
What To Do
📋 Official NWS Guidance
Persons with interests along this river need to remain aware of the latest forecasts and associated flood risk for their area. Stay tuned for further updates on this flooding situation. Additional information is available at www.weather.gov.
Also In Effect For
This same Flood Warning also covers:
Other Active Alerts in Illinois
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Flood Warning
Flood Warning
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Hydrologic Outlook
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Frequently Asked Questions
What does a Flood Warning mean for Mason County, Illinois?
Flooding is occurring or imminent along rivers, streams, or low-lying areas.
Is this Flood Warning currently active?
Yes — this alert is active as of our last check (1 minute ago). It's set to expire August 16, 2026 at 3:15 AM ET.
How do I get notified about Flood Warning alerts for Mason County?
Download StormCast free on Google Play and set Mason County, Illinois as one of your monitored locations. StormCast checks the NWS feed continuously and pushes alerts like this directly to your phone — even with the screen off.
What other areas does this alert cover?
This same Flood Warning is also in effect for Cass County, Fulton County.