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Flood in Sangamon County, Illinois
83 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 83 flood events in Sangamon County, Illinois, between 1950 and 2026, spread over 26 years.
May is the busiest month, with 25 of the recorded events. The last 20 years account for 64 events against 19 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 1.3% of the 6,507 flood events recorded in Illinois; its 9.6 per 100 square miles compares with 11.7 statewide.
NCEI attributes 2 deaths in the county to floods and flash floods.
Compared with Illinois
| Measure | Sangamon County | Illinois | US |
|---|---|---|---|
| Flood events since 1950 | 83 | 6,507 | 183,559 |
| Per 100 square miles | 9.6 | 11.7 | 5.2 |
| Per 10,000 residents | 4.3 | 5.1 | 5.5 |
| Deaths recorded | 2 | 61 | 2,961 |
| Busiest month | May | June | June |
By year
Seasonality
1Feb
2Mar
0Apr
8May
25Jun
21Jul
5Aug
14Sep
7Oct
0Nov
0Dec
0
Recorded events
All 83 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 Jun 2026 | Flash Flood | — | — | — | — | — | County |
| 11 Jun 2026 | Flash Flood | — | — | — | — | — | County |
| 8 Jun 2026 | Flood | — | — | — | — | — | County |
| 20 May 2025 | Flash Flood | — | — | — | — | — | County |
| 2 Apr 2025 | Flash Flood | — | — | — | — | — | County |
| 30 Aug 2024 | Flash Flood | — | — | — | — | — | County |
| 30 Aug 2024 | Flash Flood | — | — | — | — | — | County |
| 24 May 2024 | Flood | — | — | — | — | — | County |
| 27 Apr 2024 | Flash Flood | — | — | — | — | — | County |
| 9 Aug 2023 | Flash Flood | — | — | — | — | — | County |
| 14 May 2023 | Flash Flood | — | $2K | — | — | — | County |
| 14 May 2023 | Flash Flood | — | $2K | — | — | — | County |
| 14 May 2023 | Flash Flood | — | $5K | — | — | — | County |
| 7 May 2023 | Flash Flood | — | $2K | $2K | — | — | County |
| 19 Sep 2022 | Flash Flood | — | — | — | — | — | County |
| 2 Aug 2022 | Flash Flood | — | — | — | — | — | County |
| 2 Aug 2022 | Flash Flood | — | — | — | — | — | County |
| 8 Jul 2022 | Flash Flood | — | — | — | — | — | County |
| 25 Jun 2022 | Flash Flood | — | — | — | — | — | County |
| 11 Jul 2021 | Flash Flood | — | — | — | — | — | County |
| 29 Jun 2021 | Flood | — | — | — | — | — | County |
| 17 May 2020 | Flood | — | — | — | — | — | County |
| 16 May 2020 | Flash Flood | — | — | — | — | — | County |
| 28 Apr 2020 | Flash Flood | — | — | — | — | — | County |
| 28 Apr 2020 | Flash Flood | — | — | — | — | — | County |
| 1 Sep 2019 | Flash Flood | — | — | — | — | — | County |
| 1 Sep 2019 | Flood | — | — | — | — | — | County |
| 11 Aug 2019 | Flash Flood | — | — | — | — | — | County |
| 22 Jun 2019 | Flash Flood | — | — | — | — | — | County |
| 1 May 2019 | Flood | — | — | — | — | — | County |
| 30 Apr 2019 | Flash Flood | — | — | — | — | — | County |
| 11 Jun 2018 | Flash Flood | — | — | — | — | — | County |
| 19 May 2017 | Flash Flood | — | — | — | — | — | County |
| 29 Apr 2017 | Flash Flood | — | — | — | — | — | County |
| 29 Apr 2017 | Flood | — | — | — | — | — | County |
| 28 Aug 2016 | Flash Flood | — | — | — | — | — | County |
| 12 Aug 2016 | Flash Flood | — | $2.2M | — | — | — | County |
| 12 Aug 2016 | Flood | — | — | — | — | — | County |
| 28 Jun 2015 | Flash Flood | — | — | — | — | — | County |
| 28 Aug 2014 | Flash Flood | — | — | — | — | — | County |
| 28 Aug 2014 | Flash Flood | — | $12M | — | — | — | County |
| 28 Aug 2014 | Flood | — | — | — | — | — | County |
| 4 Jun 2014 | Flash Flood | — | — | — | — | — | County |
| 20 Feb 2014 | Flash Flood | — | — | — | — | — | County |
| 1 Jun 2013 | Flash Flood | — | — | — | — | — | County |
| 1 Jun 2013 | Flood | — | — | — | — | — | County |
| 31 May 2013 | Flash Flood | — | — | — | — | — | County |
| 26 Jun 2011 | Flood | — | — | — | — | — | County |
| 25 Jun 2011 | Flash Flood | — | — | — | — | — | County |
| 18 Jun 2011 | Flood | — | — | — | 1 | — | County |
| 17 Jun 2011 | Flash Flood | — | $3.0M | $10M | — | — | County |
| 25 May 2011 | Flash Flood | — | — | — | — | — | County |
| 2 Sep 2010 | Flash Flood | — | — | — | — | — | County |
| 2 Sep 2010 | Flash Flood | — | — | — | — | — | County |
| 20 Aug 2010 | Flood | — | — | — | 1 | — | County |
| 15 Jun 2010 | Flash Flood | — | — | — | — | — | County |
| 26 May 2010 | Flash Flood | — | $9.8M | — | — | — | County |
| 25 May 2010 | Flash Flood | — | — | — | — | — | County |
| 6 Sep 2009 | Flash Flood | — | — | — | — | — | County |
| 6 Sep 2009 | Flash Flood | — | — | — | — | — | County |
| 28 Jul 2009 | Flash Flood | — | — | — | — | — | County |
| 13 May 2009 | Flash Flood | — | — | — | — | — | County |
| 12 Jul 2008 | Flash Flood | — | — | — | — | — | County |
| 4 Feb 2008 | Flash Flood | — | — | — | — | — | County |
| 31 May 2006 | Flash Flood | — | — | — | — | — | County |
| 12 Jan 2005 | Flash Flood | — | — | — | — | — | County |
| 25 Aug 2004 | Flash Flood | — | — | — | — | — | County |
| 11 Jun 2003 | Flash Flood | — | — | — | — | — | County |
| 10 May 2003 | Flash Flood | — | — | — | — | — | County |
| 27 Jul 2002 | Flash Flood | — | — | — | — | — | County |
| 13 Jun 2002 | Flash Flood | — | — | — | — | — | County |
| 11 Jun 2002 | Flash Flood | — | — | — | — | — | County |
| 28 May 2002 | Flash Flood | — | — | — | — | — | County |
| 27 May 2002 | Flash Flood | — | $400K | — | — | — | County |
| 13 May 2002 | Flood | — | — | — | — | — | Forecast zone |
| 12 May 2002 | Flash Flood | — | — | — | — | — | County |
| 12 May 2002 | Flood | — | — | — | — | — | Forecast zone |
| 7 May 2002 | Flash Flood | — | — | — | — | — | County |
| 6 May 2002 | Flash Flood | — | — | — | — | — | County |
| 27 Apr 2002 | Flash Flood | — | — | — | — | — | County |
| 6 Jun 2001 | Flash Flood | — | $500K | — | — | — | County |
| 26 Jun 2000 | Flood | — | — | — | — | — | County |
| 8 May 1996 | Flash Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has Sangamon County had?
83 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 Sangamon County?
11 Jun 2026 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Sangamon County?
The flash flood of 17 Jun 2011, with property damage estimated by NCEI at $3.0M and crop damage at $10M.
How does Sangamon County compare with Illinois for flood?
9.6 events per 100 square miles against 11.7 statewide; the county holds 83 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.