States › Illinois › Carroll County › Flood
Flood in Carroll County, Illinois
50 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.
Carroll County, Illinois, has 50 flood events in the NCEI record since 1950, with at least one in 22 different years.
June is the busiest month, with 16 of the recorded events. The last 20 years account for 36 events against 14 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 11.2 per 100 square miles compares with 11.7 statewide.
Compared with Illinois
| Measure | Carroll County | Illinois | US |
|---|---|---|---|
| Flood events since 1950 | 50 | 6,507 | 183,559 |
| Per 100 square miles | 11.2 | 11.7 | 5.2 |
| Per 10,000 residents | 31.9 | 5.1 | 5.5 |
| Deaths recorded | 0 | 61 | 2,961 |
| Busiest month | June | June | June |
By year
Seasonality
0Feb
2Mar
0Apr
9May
7Jun
16Jul
12Aug
2Sep
1Oct
1Nov
0Dec
0
Recorded events
All 50 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 |
|---|---|---|---|---|---|---|---|
| 15 Apr 2026 | Flash Flood | — | — | — | — | — | County |
| 7 Jul 2024 | Flood | — | — | — | — | — | County |
| 22 Jun 2024 | Flash Flood | — | — | — | — | — | County |
| 25 Apr 2023 | Flood | — | — | — | — | — | County |
| 19 Aug 2022 | Flash Flood | — | — | — | — | — | County |
| 28 May 2020 | Flash Flood | — | — | — | — | — | County |
| 2 Oct 2019 | Flood | — | — | — | — | — | County |
| 5 Jun 2019 | Flash Flood | — | — | — | — | — | County |
| 1 May 2019 | Flood | — | — | — | — | — | County |
| 27 Apr 2019 | Flood | — | — | — | — | — | County |
| 4 Apr 2019 | Flood | — | — | — | — | — | County |
| 26 Jul 2017 | Flash Flood | — | $5K | — | — | — | County |
| 22 Jul 2017 | Flash Flood | — | $5K | — | — | — | County |
| 21 Jul 2017 | Flash Flood | — | $1K | — | — | — | County |
| 15 Jun 2016 | Flash Flood | — | — | — | — | — | County |
| 15 Jun 2016 | Flood | — | — | — | — | — | County |
| 17 Sep 2015 | Flash Flood | — | — | — | — | — | County |
| 18 Aug 2015 | Flash Flood | — | — | — | — | — | County |
| 19 Jun 2014 | Flash Flood | — | — | — | — | — | County |
| 17 Apr 2013 | Flash Flood | — | $250K | — | — | — | County |
| 28 Jul 2011 | Flash Flood | — | $250K | — | — | — | County |
| 27 Jul 2011 | Flash Flood | — | $250K | — | — | — | County |
| 18 Apr 2011 | Flood | — | $250K | — | — | — | County |
| 24 Jul 2010 | Flash Flood | — | $10M | — | — | — | County |
| 24 Jul 2010 | Flood | — | — | — | — | — | County |
| 23 Jul 2010 | Flash Flood | — | $1.0M | — | — | — | County |
| 27 Jul 2009 | Flash Flood | — | — | — | — | — | County |
| 19 Jun 2009 | Flash Flood | — | — | — | — | — | County |
| 13 May 2009 | Flash Flood | — | $5K | — | — | — | County |
| 13 May 2009 | Flash Flood | — | — | — | — | — | County |
| 13 May 2009 | Flash Flood | — | — | — | — | — | County |
| 13 May 2009 | Flash Flood | — | — | — | — | — | County |
| 1 Jun 2008 | Flood | — | — | — | — | — | County |
| 1 Apr 2008 | Flood | — | — | — | — | — | County |
| 18 Jul 2007 | Flash Flood | — | — | — | — | — | County |
| 9 Jul 2007 | Flash Flood | — | $500 | — | — | — | County |
| 25 Jun 2006 | Flash Flood | — | $2K | — | — | — | County |
| 25 Jun 2006 | Flash Flood | — | $3K | — | — | — | County |
| 25 Jun 2006 | Flash Flood | — | $3K | — | — | — | County |
| 18 Jun 2004 | Flood | — | — | — | — | — | Forecast zone |
| 4 Jun 2002 | Flash Flood | — | — | — | — | — | County |
| 4 Jun 2002 | Flash Flood | — | — | — | — | — | County |
| 1 May 2001 | Flood | — | — | — | — | — | Forecast zone |
| 14 Apr 2001 | Flood | — | — | — | — | — | Forecast zone |
| 24 Feb 2001 | Flood | — | — | — | — | — | County |
| 13 Jun 2000 | Flood | — | — | — | — | — | County |
| 13 Jun 2000 | Flood | — | — | — | — | — | County |
| 2 Jun 2000 | Flood | — | — | — | — | — | Forecast zone |
| 8 Apr 1997 | Flood | — | — | — | — | — | Forecast zone |
| 20 Feb 1997 | Flash Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has Carroll County had?
50 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 Carroll County?
15 Apr 2026 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Carroll County?
The flash flood of 24 Jul 2010, with property damage estimated by NCEI at $10M.
How does Carroll County compare with Illinois for flood?
11.2 events per 100 square miles against 11.7 statewide; the county holds 50 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.