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Flood in McLean County, Illinois
52 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 52 flood events in McLean County, Illinois, between 1950 and 2026, spread over 19 years.
June is the busiest month, with 18 of the recorded events. The last 20 years account for 44 events against 8 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 0.8% of the 6,507 flood events recorded in Illinois; its 4.4 per 100 square miles compares with 11.7 statewide.
Compared with Illinois
| Measure | McLean County | Illinois | US |
|---|---|---|---|
| Flood events since 1950 | 52 | 6,507 | 183,559 |
| Per 100 square miles | 4.4 | 11.7 | 5.2 |
| Per 10,000 residents | 3.0 | 5.1 | 5.5 |
| Deaths recorded | 0 | 61 | 2,961 |
| Busiest month | June | June | June |
By year
Seasonality
1Feb
1Mar
0Apr
2May
10Jun
18Jul
15Aug
3Sep
1Oct
0Nov
1Dec
0
Recorded events
All 52 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 |
|---|---|---|---|---|---|---|---|
| 17 Jun 2026 | Flash Flood | — | — | — | — | — | County |
| 17 Jun 2026 | Flash Flood | — | — | — | — | — | County |
| 17 Jun 2026 | Flash Flood | — | — | — | — | — | County |
| 17 Jun 2026 | Flash Flood | — | — | — | — | — | County |
| 11 Jun 2026 | Flood | — | — | — | — | — | County |
| 10 Jun 2026 | Flash Flood | — | — | — | — | — | County |
| 10 Jun 2026 | Flood | — | — | — | — | — | County |
| 8 Jul 2025 | Flash Flood | — | — | — | — | — | County |
| 8 Jul 2025 | Flash Flood | — | — | — | — | — | County |
| 7 May 2023 | Flash Flood | — | $5K | — | — | — | County |
| 7 May 2023 | Flash Flood | — | $1K | — | — | — | County |
| 23 Jul 2022 | Flash Flood | — | — | — | — | — | County |
| 25 Jun 2022 | Flash Flood | — | — | — | — | — | County |
| 12 Aug 2021 | Flash Flood | — | — | — | — | — | County |
| 8 Aug 2021 | Flash Flood | — | — | — | — | — | County |
| 16 Jul 2021 | Flood | — | — | — | — | — | County |
| 26 Jun 2021 | Flash Flood | — | $200K | — | — | — | County |
| 25 Jun 2021 | Flash Flood | — | $12M | — | — | — | County |
| 8 Jul 2020 | Flash Flood | — | — | — | — | — | County |
| 8 Jul 2020 | Flash Flood | — | — | — | — | — | County |
| 26 Apr 2020 | Flood | — | — | — | — | — | County |
| 3 Jul 2019 | Flash Flood | — | — | — | — | — | County |
| 1 May 2019 | Flood | — | — | — | — | — | County |
| 18 Nov 2017 | Flash Flood | — | — | — | — | — | County |
| 17 Jun 2017 | Flash Flood | — | — | — | — | — | County |
| 17 Jun 2017 | Flood | — | — | — | — | — | County |
| 9 Jul 2015 | Flood | — | — | — | — | — | County |
| 8 Jul 2015 | Flash Flood | — | $500K | — | — | — | County |
| 18 Jun 2015 | Flash Flood | — | — | — | — | — | County |
| 14 Jun 2015 | Flash Flood | — | — | — | — | — | County |
| 14 Jun 2015 | Flash Flood | — | — | — | — | — | County |
| 7 Jun 2015 | Flash Flood | — | — | — | — | — | County |
| 12 Jul 2014 | Flash Flood | — | — | — | — | — | County |
| 12 Jul 2014 | Flood | — | — | — | — | — | County |
| 12 Jul 2014 | Flood | — | — | — | — | — | County |
| 12 Jul 2014 | Flash Flood | — | — | — | — | — | County |
| 11 May 2014 | Flash Flood | — | — | — | — | — | County |
| 20 Feb 2014 | Flash Flood | — | — | — | — | — | County |
| 31 May 2013 | Flash Flood | — | — | — | — | — | County |
| 15 Jun 2010 | Flash Flood | — | — | — | — | — | County |
| 12 Jun 2010 | Flash Flood | — | — | — | — | — | County |
| 15 May 2009 | Flash Flood | — | — | — | — | — | County |
| 13 May 2009 | Flash Flood | — | — | — | — | — | County |
| 13 Sep 2008 | Flash Flood | — | $35K | — | — | — | County |
| 12 Jan 2005 | Flash Flood | — | — | — | — | — | County |
| 25 Aug 2004 | Flash Flood | — | — | — | — | — | County |
| 30 May 2004 | Flash Flood | — | — | — | — | — | County |
| 18 May 2004 | Flash Flood | — | — | — | — | — | County |
| 9 Jul 2003 | Flash Flood | — | — | — | — | — | County |
| 22 Jul 2002 | Flash Flood | — | — | — | — | — | County |
| 11 May 2002 | Flash Flood | — | — | — | — | — | County |
| 29 Apr 1998 | Flash Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has McLean County had?
52 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 McLean County?
17 Jun 2026 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in McLean County?
The flash flood of 25 Jun 2021, with property damage estimated by NCEI at $12M.
How does McLean County compare with Illinois for flood?
4.4 events per 100 square miles against 11.7 statewide; the county holds 52 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.