Flood Warning Issued for Louisa County, Iowa and Mercer County, Illinois
This alert is no longer in effect.
NOAA issued it on April 16, 2026, 4 months ago. Warnings of this kind stay in effect for hours to a few days, so this page is a historical record of what was issued, not a current warning. For conditions where you are right now, check weather.gov (US), weather.gc.ca (Canada), the Met Office (UK), or the Bureau of Meteorology (Australia).
Areazine synthesizes this NWS weather alert directly from NOAA's official public data feed. See our methodology for full source attribution and refresh cadence.
A Flood Warning is in effect for Louisa County in Iowa and Mercer County in Illinois, with minor flooding expected along the Mississippi River starting Saturday afternoon.
Read this weather record in 30 seconds
- Record type
- Flood Warning
- Affected area
- Southeastern Iowa and Western Illinois
- Issued
- April 16, 2026
- Issuing authority
- NWS Quad Cities IAIL
Flood notices turn on location and timing. Treat the named area as this record's scope; do not assume nearby counties, parishes, or waterways were included.
Record status: historical. It was issued 4 months ago; use the issuing agency's live warning service for current conditions in Southeastern Iowa and Western Illinois.
Alert Details
The National Weather Service (NWS) Quad Cities IA IL has issued a Flood Warning. This alert is effective from April 16, 2026, at 11:30 AM CDT, with onset on April 18, 2026, at 1:00 PM CDT.
Affected Areas
The warning affects Louisa County in Iowa and Mercer County in Illinois. It also involves the Mississippi River at New Boston LD17, impacting areas including Des Moines, Henderson, Hancock, Clark, Rock Island, and Muscatine Counties as described.
What You Should Do
Turn around, don't drown when encountering flooded roads. Do not attempt to drive around barricades or through flooded areas. Exercise caution when walking near riverbanks.
Expected Conditions
Minor flooding is forecast. The river stage at New Boston LD17 was 14.3 feet at 11:10 AM CDT on April 16, 2026, with flood stage at 15.0 feet. The river is expected to rise above flood stage early Saturday afternoon on April 18, 2026, and reach 16.0 feet by April 23, 2026.
Timeline
The alert is effective from April 16, 2026, at 11:30 AM CDT, with onset on April 18, 2026, at 1:00 PM CDT, and will continue until further notice.
Original source: NOAA Official Notice ↗
Related Weather Alerts
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Two Areazine-derived peer sets for this NWS weather alert: nearest notices by body length and by same severity near the same agency date. Peers come from other categories so they are not the same-feed Related list above.
Similar body length
Nearest notices by article body length (1,125 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to April 16, 2026.
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