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Flood in Marion County, Illinois
37 floods and flash floods events in the NCEI Storm Events record, 1950 to 2026. Event types counted: Flood, Flash Flood, Coastal Flood, Lakeshore Flood.
NCEI notes that Storm Data is compiled from a variety of sources including the National Weather Service, other federal, state and local agencies, the media and the public; that property and crop damage figures are estimates; and that some events are recorded by NWS forecast zone rather than by county. FEMA notes that NFIP claim records are redacted and aggregated to protect the privacy of policyholders. Storm records through 30 Jun 2026.
NCEI records 37 flood events in Marion County, Illinois, between 1950 and 2026, spread over 18 years.
June is the busiest month, with 11 of the recorded events. The last 20 years account for 28 events against 9 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 0.6% of the 6,507 flood events recorded in Illinois; its 6.5 per 100 square miles compares with 11.7 statewide.
NCEI attributes 5 deaths in the county to floods and flash floods.
Compared with Illinois
| Measure | Marion County | Illinois | US |
|---|---|---|---|
| Flood events since 1950 | 37 | 6,507 | 183,559 |
| Per 100 square miles | 6.5 | 11.7 | 5.2 |
| Per 10,000 residents | 9.9 | 5.1 | 5.5 |
| Deaths recorded | 5 | 61 | 2,961 |
| Busiest month | June | June | June |
By year
Seasonality
0Feb
0Mar
4Apr
5May
4Jun
11Jul
5Aug
7Sep
0Oct
0Nov
0Dec
1
Recorded events
All 37 events, most recent first. Magnitude is hail size, tornado rating or wind speed as recorded.
| Date | Event type | Magnitude | Property damage | Crop damage | Deaths | Injuries | Geography |
|---|---|---|---|---|---|---|---|
| 27 Jun 2026 | Flash Flood | — | $10K | — | — | — | County |
| 8 Jun 2026 | Flood | — | — | — | — | — | County |
| 18 May 2026 | Flash Flood | — | $100K | — | — | — | County |
| 29 Apr 2025 | Flood | — | — | — | — | — | County |
| 4 Apr 2025 | Flash Flood | — | $100K | — | — | — | County |
| 3 Aug 2023 | Flash Flood | — | — | — | — | — | County |
| 17 Jul 2022 | Flash Flood | — | — | — | — | — | County |
| 21 Aug 2021 | Flash Flood | — | — | — | — | — | County |
| 21 Aug 2019 | Flash Flood | — | — | — | — | — | County |
| 13 Aug 2019 | Flash Flood | — | — | — | — | — | County |
| 12 Aug 2019 | Flash Flood | — | — | — | — | — | County |
| 5 Jun 2019 | Flash Flood | — | — | — | — | — | County |
| 11 Jun 2018 | Flash Flood | — | — | — | — | — | County |
| 26 Dec 2015 | Flash Flood | — | — | — | 5 | — | County |
| 3 Apr 2014 | Flash Flood | — | — | — | — | — | County |
| 23 Jun 2013 | Flash Flood | — | — | — | — | — | County |
| 17 Jun 2013 | Flash Flood | — | — | — | — | — | County |
| 30 Jul 2011 | Flash Flood | — | — | — | — | — | County |
| 12 Jul 2011 | Flash Flood | — | — | — | — | — | County |
| 7 Jul 2011 | Flash Flood | — | — | — | — | — | County |
| 18 Jun 2011 | Flash Flood | — | — | — | — | — | County |
| 25 Apr 2011 | Flash Flood | — | — | — | — | — | County |
| 7 Apr 2010 | Flash Flood | — | — | — | — | — | County |
| 13 Jun 2008 | Flash Flood | — | $1K | — | — | — | County |
| 6 Jun 2008 | Flash Flood | — | $1K | — | — | — | County |
| 31 Mar 2008 | Flash Flood | — | — | — | — | — | County |
| 27 Mar 2008 | Flash Flood | — | — | — | — | — | County |
| 18 Mar 2008 | Flash Flood | — | $25K | — | — | — | County |
| 26 Aug 2004 | Flash Flood | — | — | — | — | — | County |
| 27 May 2004 | Flash Flood | — | — | — | — | — | County |
| 26 Mar 2004 | Flash Flood | — | — | — | — | — | County |
| 12 May 2002 | Flash Flood | — | — | — | — | — | County |
| 1 May 2002 | Flood | — | — | — | — | — | Forecast zone |
| 24 Jun 2000 | Flash Flood | — | — | — | — | — | County |
| 1 Jul 1999 | Flood | — | — | — | — | — | County |
| 13 Jun 1999 | Flash Flood | — | — | — | — | — | County |
| 3 Aug 1998 | Flash Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has Marion County had?
37 events in the NCEI Storm Events record between 1950 and 2026. Reporting of floods and flash floods became far more complete after 1996, so early decades undercount.
When was the last recorded flood event in Marion County?
27 Jun 2026 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Marion County?
The flash flood of 4 Apr 2025, with property damage estimated by NCEI at $100K.
How does Marion County compare with Illinois for flood?
6.5 events per 100 square miles against 11.7 statewide; the county holds 37 of the state's 6,507 recorded events.
Provenance
NOAA NCEI Storm Events Database, yearly details files through 30 Jun 2026, public domain. County-recorded events plus zone-recorded events whose forecast zone is named for the county (marked "Forecast zone"). Population and area from the US Census Bureau (2021). Built 1 Oct 2026. See the methodology, the Flood hub and the county page.