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Flood in Macon County, Illinois
46 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 46 flood events in Macon County, Illinois, between 1950 and 2026, spread over 21 years.
May is the busiest month, with 11 of the recorded events. The last 20 years account for 29 events against 17 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 0.7% of the 6,507 flood events recorded in Illinois; its 7.9 per 100 square miles compares with 11.7 statewide.
Compared with Illinois
| Measure | Macon County | Illinois | US |
|---|---|---|---|
| Flood events since 1950 | 46 | 6,507 | 183,559 |
| Per 100 square miles | 7.9 | 11.7 | 5.2 |
| Per 10,000 residents | 4.5 | 5.1 | 5.5 |
| Deaths recorded | 0 | 61 | 2,961 |
| Busiest month | May | June | June |
By year
Seasonality
2Feb
1Mar
2Apr
1May
11Jun
11Jul
4Aug
9Sep
3Oct
0Nov
0Dec
2
Recorded events
All 46 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 |
|---|---|---|---|---|---|---|---|
| 11 Mar 2026 | Flash Flood | — | — | — | — | — | County |
| 12 Aug 2025 | Flash Flood | — | — | — | — | — | County |
| 12 Aug 2025 | Flash Flood | — | — | — | — | — | County |
| 19 Jul 2025 | Flash Flood | — | — | — | — | — | County |
| 19 May 2024 | Flash Flood | — | — | — | — | — | County |
| 4 Sep 2022 | Flash Flood | — | — | — | — | — | County |
| 3 Sep 2022 | Flash Flood | — | — | — | — | — | County |
| 3 Aug 2022 | Flood | — | — | — | — | — | County |
| 3 Aug 2022 | Flash Flood | — | — | — | — | — | County |
| 2 Aug 2022 | Flash Flood | — | — | — | — | — | County |
| 22 Jun 2020 | Flash Flood | — | — | — | — | — | County |
| 22 Jun 2020 | Flash Flood | — | — | — | — | — | County |
| 19 May 2017 | Flash Flood | — | — | — | — | — | County |
| 27 Dec 2015 | Flood | — | $400K | — | — | — | County |
| 26 Dec 2015 | Flash Flood | — | — | — | — | — | County |
| 26 Aug 2014 | Flash Flood | — | $20M | — | — | — | County |
| 4 Jun 2014 | Flash Flood | — | — | — | — | — | County |
| 20 Feb 2014 | Flash Flood | — | — | — | — | — | County |
| 10 Jul 2013 | Flash Flood | — | — | — | — | — | County |
| 22 Jun 2013 | Flash Flood | — | — | — | — | — | County |
| 1 Jun 2013 | Flash Flood | — | — | — | — | — | County |
| 31 May 2013 | Flash Flood | — | — | — | — | — | County |
| 24 Jul 2010 | Flash Flood | — | $75K | — | — | — | County |
| 22 Jun 2010 | Flash Flood | — | — | — | — | — | County |
| 12 Jun 2010 | Flash Flood | — | — | — | — | — | County |
| 6 Sep 2009 | Flash Flood | — | — | — | — | — | County |
| 15 May 2009 | Flash Flood | — | — | — | — | — | County |
| 14 May 2009 | Flash Flood | — | — | — | — | — | County |
| 28 Mar 2007 | Flash Flood | — | — | — | — | — | County |
| 26 Jul 2006 | Flash Flood | — | — | — | — | — | County |
| 6 Apr 2006 | Flash Flood | — | — | — | — | — | County |
| 14 Jun 2005 | Flash Flood | — | — | — | — | — | County |
| 11 May 2005 | Flash Flood | — | — | — | — | — | County |
| 13 Jan 2005 | Flash Flood | — | — | — | — | — | County |
| 11 Jan 2005 | Flash Flood | — | — | — | — | — | County |
| 25 Aug 2004 | Flash Flood | — | — | — | — | — | County |
| 15 Jun 2004 | Flash Flood | — | — | — | — | — | County |
| 10 May 2003 | Flash Flood | — | — | — | — | — | County |
| 12 May 2002 | Flash Flood | — | — | — | — | — | County |
| 12 May 2002 | Flood | — | — | — | — | — | Forecast zone |
| 7 May 2002 | Flash Flood | — | — | — | — | — | County |
| 30 Aug 2001 | Flash Flood | — | — | — | — | — | County |
| 6 Jun 2001 | Flash Flood | — | — | — | — | — | County |
| 13 Aug 1999 | Flash Flood | — | — | — | — | — | County |
| 30 Jun 1997 | Flash Flood | — | — | — | — | — | County |
| 8 May 1996 | Flash Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has Macon County had?
46 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 Macon County?
11 Mar 2026 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Macon County?
The flash flood of 26 Aug 2014, with property damage estimated by NCEI at $20M.
How does Macon County compare with Illinois for flood?
7.9 events per 100 square miles against 11.7 statewide; the county holds 46 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.