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Flood in Delaware County, Ohio
72 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.
Delaware County, Ohio, has 72 flood events in the NCEI record since 1950, with at least one in 20 different years.
June is the busiest month, with 23 of the recorded events. The last 20 years account for 47 events against 25 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 1.1% of the 6,794 flood events recorded in Ohio; its 16.2 per 100 square miles compares with 16.6 statewide.
Compared with Ohio
| Measure | Delaware County | Ohio | US |
|---|---|---|---|
| Flood events since 1950 | 72 | 6,794 | 183,559 |
| Per 100 square miles | 16.2 | 16.6 | 5.2 |
| Per 10,000 residents | 3.3 | 5.8 | 5.5 |
| Deaths recorded | 0 | 74 | 2,961 |
| Busiest month | June | June | June |
By year
Seasonality
7Feb
1Mar
4Apr
1May
12Jun
23Jul
10Aug
2Sep
5Oct
0Nov
6Dec
1
Recorded events
All 72 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 |
|---|---|---|---|---|---|---|---|
| 23 May 2026 | Flood | — | — | — | — | — | County |
| 23 May 2026 | Flood | — | — | — | — | — | County |
| 31 Aug 2021 | Flood | — | — | — | — | — | County |
| 11 Jul 2021 | Flood | — | — | — | — | — | County |
| 1 Jul 2021 | Flood | — | — | — | — | — | County |
| 7 Sep 2020 | Flood | — | — | — | — | — | County |
| 19 May 2020 | Flood | — | — | — | — | — | County |
| 19 May 2020 | Flood | — | — | — | — | — | County |
| 19 May 2020 | Flash Flood | — | $5K | — | — | — | County |
| 19 May 2020 | Flood | — | — | — | — | — | County |
| 19 May 2020 | Flood | — | — | — | — | — | County |
| 28 Mar 2020 | Flash Flood | — | — | — | — | — | County |
| 3 Jul 2019 | Flood | — | — | — | — | — | County |
| 3 Jul 2019 | Flood | — | — | — | — | — | County |
| 3 Jul 2019 | Flood | — | — | — | — | — | County |
| 3 Jul 2019 | Flood | — | — | — | — | — | County |
| 19 Jun 2019 | Flood | — | — | — | — | — | County |
| 7 Feb 2019 | Flood | — | — | — | — | — | County |
| 1 Sep 2018 | Flood | — | — | — | — | — | County |
| 22 Jun 2018 | Flood | — | — | — | — | — | County |
| 22 Jun 2018 | Flood | — | — | — | — | — | County |
| 22 Jun 2018 | Flood | — | — | — | — | — | County |
| 22 Jun 2018 | Flood | — | — | — | — | — | County |
| 22 Jun 2018 | Flood | — | — | — | — | — | County |
| 22 Jun 2018 | Flood | — | — | — | — | — | County |
| 21 May 2018 | Flood | — | — | — | — | — | County |
| 19 Nov 2017 | Flood | — | — | — | — | — | County |
| 18 Nov 2017 | Flash Flood | — | — | — | — | — | County |
| 18 Nov 2017 | Flash Flood | — | — | — | — | — | County |
| 18 Nov 2017 | Flash Flood | — | — | — | — | — | County |
| 18 Nov 2017 | Flood | — | — | — | — | — | County |
| 18 Jul 2016 | Flood | — | — | — | — | — | County |
| 23 Jun 2016 | Flash Flood | — | — | — | — | — | County |
| 23 Jun 2016 | Flash Flood | — | $5K | — | — | — | County |
| 15 Jun 2016 | Flash Flood | — | $500 | — | — | — | County |
| 17 Jun 2015 | Flood | — | — | — | — | — | County |
| 17 Jun 2015 | Flood | — | — | — | — | — | County |
| 17 Jun 2015 | Flood | — | — | — | — | — | County |
| 17 Jun 2015 | Flood | — | — | — | — | — | County |
| 25 Jun 2014 | Flash Flood | — | $1K | — | — | — | County |
| 22 Dec 2013 | Flood | — | — | — | — | — | County |
| 22 Jul 2013 | Flood | — | — | — | — | — | County |
| 23 Jun 2013 | Flood | — | $1K | — | — | — | County |
| 24 Jul 2011 | Flash Flood | — | $20K | — | — | — | County |
| 19 Mar 2008 | Flood | — | $3K | — | — | — | County |
| 4 Mar 2008 | Flood | — | $2K | — | — | — | County |
| 1 Mar 2007 | Flood | — | $3K | — | — | — | County |
| 9 Nov 2005 | Flood | — | — | — | — | — | Forecast zone |
| 13 Jan 2005 | Flood | — | — | — | — | — | Forecast zone |
| 11 Jan 2005 | Flood | — | $15K | — | — | — | Forecast zone |
| 5 Jan 2005 | Flood | — | $20K | — | — | — | Forecast zone |
| 15 Jun 2004 | Flood | — | — | — | — | — | Forecast zone |
| 15 Jun 2004 | Flood | — | — | — | — | — | Forecast zone |
| 15 Jun 2004 | Flash Flood | — | $250K | — | — | — | County |
| 13 Jun 2004 | Flood | — | — | — | — | — | Forecast zone |
| 21 May 2004 | Flood | — | — | — | — | — | Forecast zone |
| 4 Jan 2004 | Flood | — | — | — | — | — | Forecast zone |
| 4 Jan 2004 | Flood | — | — | — | — | — | Forecast zone |
| 27 Sep 2003 | Flood | — | — | — | — | — | Forecast zone |
| 1 Sep 2003 | Flood | — | $2K | — | — | — | Forecast zone |
| 12 Aug 2003 | Flood | — | — | — | — | — | Forecast zone |
| 23 Jul 2003 | Flood | — | — | — | — | — | Forecast zone |
| 15 May 2003 | Flood | — | — | — | — | — | Forecast zone |
| 9 May 2003 | Flood | — | — | — | — | — | Forecast zone |
| 23 Jun 2001 | Flash Flood | — | $3K | — | — | — | County |
| 23 Sep 2000 | Flash Flood | — | $10K | — | — | — | County |
| 8 Apr 2000 | Flash Flood | — | $3K | — | — | — | County |
| 3 Jan 2000 | Flash Flood | — | $3K | — | — | — | County |
| 16 Jun 1997 | Flash Flood | — | $5K | — | — | — | County |
| 1 Jun 1997 | Flash Flood | — | $100K | — | — | — | County |
| 11 May 1996 | Flash Flood | — | $3K | — | — | — | County |
| 17 Jan 1996 | Flood | — | $5K | — | — | — | Forecast zone |
Questions and answers
How many flood events has Delaware County had?
72 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 Delaware County?
23 May 2026 (Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Delaware County?
The flash flood of 15 Jun 2004, with property damage estimated by NCEI at $250K.
How does Delaware County compare with Ohio for flood?
16.2 events per 100 square miles against 16.6 statewide; the county holds 72 of the state's 6,794 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.