44
Recorded events
0
Direct deaths
0
Direct injuries
$10.1M
Property damage
Flash Flood in St. Clair County, Illinois: 44 recorded events between 1996 and 2025. The strongest on record measured 0. That places the county #723 nationally and #15 statewide for this hazard.
Decade by decade
Flash Flood in St. Clair County, Illinois: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for flash flood in St. Clair County is the 2000s, when 16 of the county's 44 recorded events were logged. Comparing decades is useful for spotting active periods, but the earliest years are thin because systematic reporting for this hazard began later.
Within the St. Clair County archive, flash flood makes up 4.9% of all recorded severe weather across 8 hazard types. Nationally the county sits at #723 for this hazard and #15 within Illinois, putting it in the 76.0 percentile of all U.S. counties.
Seasonality
Events by month
Jun is the peak month for flash flood in St. Clair County with 14 recorded events, while Jan is the quietest. Seasonality here is a property of the archive as much as the climate: reports cluster where population and spotter networks are densest.
Most recent
Latest recorded events
| Date | Location | Magnitude | Damage |
|---|---|---|---|
| Jul 17, 2025 | SUMMERFIELD | 0 | $25K |
| Jul 6, 2025 | SUMMERFIELD | 0 | $25K |
| Jul 6, 2025 | LEBANON | 0 | $10K |
| Apr 5, 2025 | DARMSTADT | 0 | $30K |
| Jul 15, 2023 | OAK HILLS | 0 | $0 |
| Jul 28, 2022 | VENICE | 0 | $0 |
| Jul 26, 2022 | EAST CARONDELET | 0 | $10.0M |
| Jul 25, 2021 | LEMENTON | 0 | $0 |
| Aug 12, 2020 | MILLSTADT | 0 | $0 |
| Aug 12, 2020 | WOODLAND GRANGE | 0 | $0 |
Other hazards here
More from St. Clair County
- Thunderstorm Wind 457
- Hail 319
- Tornado 56
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
Up to 9 inches of rain fell in a 6 to 10 hour period causing widespread flash flooding. The heaviest rain axis extended from East St. Louis southeastward towards Mascoutah. Numerous roads were flooded, including northbound I-55 at I-64, ramps from I-64 to I-255, U.S. Highway 50 between O'Fallon and Lebanon, and Illinois Route 15 near intersection with Frank Scott Parkway. Several water rescues were performed including on Illinois Route 15 at Karch Road, east of Freeburg and on West F Street near North 3rd Street in Belleville. An estimated 600 St. Clair County households were damaged by flash flooding. The St. Clair County Animal Shelter was flooded in Belleville so several dozen dogs and some cats had to be evacuated and placed in other shelters or homes temporarily. Overall, no injuries were reported in St. Clair County.
Heavy rain caused flash flooding at several locations in the central part of St. Clair County. Roads were reported closed in Belleville, Freeburg, and Smithton. Some basements were reported flooded with up to two feet of water.
A video submitted recorded extensive standing water and flooding along Madison Street including the parking lot of Ace Hardware Store. Water was reportedly several inches deep in the backyard of a home nearby, and flood water seeped into their basement. A total of 5.04 inches of rain fell in Lebanon within a 2.5 hour span. Nearby Summerfield also received 5 inches of rain, but flash flooding was not reported here.
Quick answers
Frequently asked
How many flash flood events are on record in St. Clair County, Illinois?
44 flash flood events are recorded in St. Clair County between 1996 and 2025, causing 0 direct deaths.
What is the strongest flash flood recorded in St. Clair County?
The strongest flash flood on record in St. Clair County measured 0.
Where does the flash flood data for St. Clair County come from?
All events come from the NOAA/NCEI Storm Events Database, the federal public-domain archive of severe weather reports. Dates are UTC, damage is as reported and not inflation-adjusted, and the most recent entries may still be revised.
Cite this page
“Flash Flood in St. Clair County, Illinois.” Severe Weather History. severeweatherhistory.com/county/illinois/st-clair-county/flash-flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.