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Flood in Alexander County, Illinois
242 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 242 flood events in Alexander County, Illinois, between 1950 and 2026, spread over 30 years.
May is the busiest month, with 45 of the recorded events. The last 20 years account for 163 events against 79 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 3.7% of the 6,507 flood events recorded in Illinois; its 102.8 per 100 square miles compares with 11.7 statewide.
Compared with Illinois
| Measure | Alexander County | Illinois | US |
|---|---|---|---|
| Flood events since 1950 | 242 | 6,507 | 183,559 |
| Per 100 square miles | 102.8 | 11.7 | 5.2 |
| Per 10,000 residents | 481.1 | 5.1 | 5.5 |
| Deaths recorded | 0 | 61 | 2,961 |
| Busiest month | May | June | June |
By year
Seasonality
24Feb
26Mar
34Apr
38May
45Jun
29Jul
19Aug
6Sep
1Oct
3Nov
3Dec
14
Recorded events
The 150 events kept for this page are the 120 most recent plus the 80 with the most damage, deaths or injuries out of 242. Magnitude is hail size, tornado rating or wind speed as recorded.
| Date | Event type | Magnitude | Property damage | Crop damage | Deaths | Injuries | Geography |
|---|---|---|---|---|---|---|---|
| 30 Apr 2026 | Flood | — | — | — | — | — | County |
| 1 Mar 2025 | Flood | — | — | — | — | — | County |
| 16 Feb 2025 | Flood | — | — | — | — | — | County |
| 18 Jul 2024 | Flood | — | — | — | — | — | County |
| 6 Jul 2024 | Flood | — | — | — | — | — | County |
| 5 Jul 2024 | Flood | — | — | — | — | — | County |
| 10 May 2024 | Flood | — | — | — | — | — | County |
| 9 May 2024 | Flood | — | — | — | — | — | County |
| 3 May 2024 | Flood | — | — | — | — | — | County |
| 1 May 2024 | Flood | — | — | — | — | — | County |
| 14 Aug 2023 | Flash Flood | — | $25K | — | — | — | County |
| 19 Jul 2023 | Flash Flood | — | $150K | — | — | — | County |
| 1 Apr 2023 | Flood | — | — | — | — | — | County |
| 28 Mar 2023 | Flood | — | — | — | — | — | County |
| 5 Mar 2023 | Flood | — | — | — | — | — | County |
| 7 May 2022 | Flood | — | — | — | — | — | County |
| 1 Mar 2022 | Flood | — | — | — | — | — | County |
| 22 Feb 2022 | Flood | — | — | — | — | — | County |
| 1 Apr 2021 | Flood | — | $4K | — | — | — | County |
| 19 Mar 2021 | Flood | — | — | — | — | — | County |
| 2 Mar 2021 | Flood | — | — | — | — | — | County |
| 1 Jun 2020 | Flood | — | — | $10K | — | — | County |
| 1 Jun 2020 | Flood | — | — | $10K | — | — | County |
| 26 May 2020 | Flood | — | — | $20K | — | — | County |
| 21 May 2020 | Flood | — | — | $20K | — | — | County |
| 1 May 2020 | Flood | — | — | $20K | — | — | County |
| 1 May 2020 | Flood | — | — | $20K | — | — | County |
| 28 Apr 2020 | Flood | — | — | $10K | — | — | County |
| 1 Apr 2020 | Flood | — | — | — | — | — | County |
| 1 Apr 2020 | Flood | — | — | — | — | — | County |
| 20 Mar 2020 | Flood | — | — | — | — | — | County |
| 1 Mar 2020 | Flood | — | $10K | $10K | — | — | County |
| 7 Feb 2020 | Flood | — | — | — | — | — | County |
| 1 Feb 2020 | Flood | — | — | — | — | — | County |
| 12 Jan 2020 | Flood | — | — | — | — | — | County |
| 2 Jan 2020 | Flood | — | — | — | — | — | County |
| 3 Dec 2019 | Flood | — | — | — | — | — | County |
| 9 Oct 2019 | Flood | — | — | — | — | — | County |
| 16 Jul 2019 | Flash Flood | — | $5K | — | — | — | County |
| 1 Jul 2019 | Flood | — | $3.0M | $7.0M | — | — | County |
| 1 Jul 2019 | Flood | — | $40K | $500K | — | — | County |
| 1 Jun 2019 | Flood | — | $50K | $50K | — | — | County |
| 1 Jun 2019 | Flood | — | $2.0M | $200K | — | — | County |
| 29 May 2019 | Flash Flood | — | — | — | — | — | County |
| 1 May 2019 | Flood | — | $50K | $50K | — | — | County |
| 1 May 2019 | Flood | — | $50K | $50K | — | — | County |
| 1 Apr 2019 | Flood | — | $50K | — | — | — | County |
| 1 Apr 2019 | Flood | — | $20K | — | — | — | County |
| 13 Mar 2019 | Flood | — | — | — | — | — | County |
| 1 Mar 2019 | Flood | — | $100K | — | — | — | County |
| 1 Mar 2019 | Flood | — | — | — | — | — | County |
| 27 Feb 2019 | Flood | — | — | — | — | — | County |
| 8 Feb 2019 | Flood | — | $50K | — | — | — | County |
| 1 Feb 2019 | Flood | — | — | — | — | — | County |
| 22 Jan 2019 | Flood | — | — | — | — | — | County |
| 3 Jan 2019 | Flood | — | — | — | — | — | County |
| 1 Jan 2019 | Flood | — | $5K | — | — | — | County |
| 28 Dec 2018 | Flood | — | — | — | — | — | County |
| 5 Dec 2018 | Flood | — | — | — | — | — | County |
| 13 Oct 2018 | Flood | — | — | — | — | — | County |
| 25 Jun 2018 | Flash Flood | — | — | — | — | — | County |
| 1 May 2018 | Flood | — | — | — | — | — | County |
| 1 Apr 2018 | Flood | — | $5K | — | — | — | County |
| 31 Mar 2018 | Flood | — | — | — | — | — | County |
| 1 Mar 2018 | Flood | — | $350K | — | — | — | County |
| 19 Feb 2018 | Flood | — | — | — | — | — | County |
| 1 Jun 2017 | Flood | — | — | — | — | — | County |
| 1 Jun 2017 | Flood | — | — | — | — | — | County |
| 1 May 2017 | Flood | — | $10K | $50K | — | — | County |
| 1 May 2017 | Flood | — | $100K | $50K | — | — | County |
| 29 Apr 2017 | Flood | — | — | — | — | — | County |
| 27 Apr 2017 | Flood | — | — | — | — | — | County |
| 10 Apr 2017 | Flood | — | — | — | — | — | County |
| 9 Apr 2017 | Flood | — | — | — | — | — | County |
| 17 Aug 2016 | Flood | — | — | — | — | — | County |
| 5 Aug 2016 | Flash Flood | — | — | — | — | — | County |
| 1 Mar 2016 | Flood | — | $1K | — | — | — | County |
| 25 Feb 2016 | Flood | — | — | — | — | — | County |
| 7 Feb 2016 | Flood | — | — | — | — | — | County |
| 1 Jan 2016 | Flood | — | $4.5M | — | — | — | County |
| 1 Jan 2016 | Flood | — | $400K | — | — | — | County |
| 25 Dec 2015 | Flood | — | — | — | — | — | County |
| 19 Dec 2015 | Flood | — | — | — | — | — | County |
| 4 Dec 2015 | Flood | — | — | — | — | — | County |
| 8 Jul 2015 | Flash Flood | — | — | — | — | — | County |
| 1 Jul 2015 | Flood | — | $5K | $30K | — | — | County |
| 1 Jul 2015 | Flood | — | $20K | $400K | — | — | County |
| 20 Jun 2015 | Flood | — | $1K | $4K | — | — | County |
| 17 Jun 2015 | Flood | — | $5K | $100K | — | — | County |
| 10 Apr 2015 | Flood | — | — | — | — | — | County |
| 11 Mar 2015 | Flood | — | — | — | — | — | County |
| 12 Jul 2014 | Flood | — | — | — | — | — | County |
| 6 Apr 2014 | Flood | — | — | $20K | — | — | County |
| 7 Jul 2013 | Flood | — | — | — | — | — | County |
| 4 Jun 2013 | Flood | — | — | $50K | — | — | County |
| 1 Jun 2013 | Flood | — | $40K | $150K | — | — | County |
| 1 May 2013 | Flood | — | $20K | — | — | — | County |
| 1 May 2013 | Flood | — | $10K | — | — | — | County |
| 19 Apr 2013 | Flood | — | $2K | — | — | — | County |
| 19 Apr 2013 | Flood | — | $2K | — | — | — | County |
| 14 Mar 2013 | Flood | — | — | — | — | — | County |
| 22 Jan 2013 | Flood | — | — | — | — | — | County |
| 1 Feb 2012 | Flood | — | — | — | — | — | County |
| 30 Jan 2012 | Flood | — | — | — | — | — | County |
| 2 Dec 2011 | Flood | — | $1K | — | — | — | County |
| 1 Jul 2011 | Flood | — | — | — | — | — | County |
| 1 Jul 2011 | Flood | — | — | — | — | — | County |
| 23 Jun 2011 | Flood | — | — | — | — | — | County |
| 1 Jun 2011 | Flood | — | — | — | — | — | County |
| 1 Jun 2011 | Flood | — | $100K | $50K | — | — | County |
| 2 May 2011 | Flash Flood | — | $50K | — | — | — | County |
| 1 May 2011 | Flood | — | $1.0M | — | — | — | County |
| 1 May 2011 | Flood | — | $30K | — | — | — | County |
| 1 May 2011 | Flood | — | $1.5M | — | — | — | County |
| 24 Apr 2011 | Flood | — | — | — | — | — | County |
| 21 Apr 2011 | Flood | — | $50K | — | — | — | County |
| 10 Apr 2011 | Flood | — | $40K | — | — | — | County |
| 2 Mar 2011 | Flood | — | — | — | — | — | County |
| 1 Mar 2011 | Flood | — | $100K | — | — | — | County |
| 27 Feb 2011 | Flood | — | — | — | — | — | County |
| 1 Aug 2010 | Flood | — | — | $1K | — | — | County |
| 1 Jul 2010 | Flood | — | — | $4K | — | — | County |
| 18 Jun 2010 | Flood | — | — | $5K | — | — | County |
| 16 May 2010 | Flood | — | — | $20K | — | — | County |
| 3 May 2010 | Flood | — | — | $20K | — | — | County |
| 1 May 2010 | Flood | — | — | $5K | — | — | County |
| 20 Jun 2009 | Flood | — | — | $10K | — | — | County |
| 4 May 2009 | Flood | — | — | $30K | — | — | County |
| 2 May 2009 | Flood | — | — | $30K | — | — | County |
| 1 Jul 2008 | Flood | — | — | $100K | — | — | County |
| 10 Jun 2008 | Flood | — | — | $10K | — | — | County |
| 8 Jun 2008 | Flood | — | — | $100K | — | — | County |
| 18 Mar 2008 | Flood | — | $800K | — | — | — | County |
| 5 Jan 2005 | Flood | — | $150K | — | — | — | Forecast zone |
| 25 Apr 2003 | Flash Flood | — | $2K | — | — | — | County |
| 13 May 2002 | Flash Flood | — | $300K | — | — | — | County |
| 8 May 2002 | Flood | — | $1.5M | — | — | — | Forecast zone |
| 1 May 2002 | Flood | — | $700K | — | — | — | Forecast zone |
| 1 May 1999 | Flood | — | $4K | — | — | — | Forecast zone |
| 1 Feb 1999 | Flood | — | $5K | — | — | — | Forecast zone |
| 21 Jan 1999 | Flash Flood | — | $30K | — | — | — | County |
| 1 Mar 1997 | Flash Flood | — | $400K | — | — | — | County |
| 4 Dec 1996 | Flood | — | — | — | — | — | Forecast zone |
| 1 Jun 1996 | Flood | — | — | — | — | — | Forecast zone |
| 1 Jun 1996 | Flood | — | — | — | — | — | Forecast zone |
| 1 May 1996 | Flood | — | — | — | — | — | Forecast zone |
| 1 May 1996 | Flood | — | — | — | — | — | Forecast zone |
| 26 Apr 1996 | Flood | — | $20K | $20K | — | — | Forecast zone |
| 5 Feb 1996 | Flood | — | — | — | — | — | Forecast zone |
| 1 Feb 1996 | Flood | — | — | — | — | — | Forecast zone |
Questions and answers
How many flood events has Alexander County had?
242 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 Alexander County?
30 Apr 2026 (Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Alexander County?
The flood of 1 Jul 2019, with property damage estimated by NCEI at $3.0M and crop damage at $7.0M.
How does Alexander County compare with Illinois for flood?
102.8 events per 100 square miles against 11.7 statewide; the county holds 242 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.