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Flood in Knox County, Ohio
31 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 31 flood events in Knox County, Ohio, between 1950 and 2026, spread over 16 years.
June is the busiest month, with 10 of the recorded events. The last 20 years account for 12 events against 19 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 0.5% of the 6,794 flood events recorded in Ohio; its 5.9 per 100 square miles compares with 16.6 statewide.
Compared with Ohio
| Measure | Knox County | Ohio | US |
|---|---|---|---|
| Flood events since 1950 | 31 | 6,794 | 183,559 |
| Per 100 square miles | 5.9 | 16.6 | 5.2 |
| Per 10,000 residents | 4.9 | 5.8 | 5.5 |
| Deaths recorded | 0 | 74 | 2,961 |
| Busiest month | June | June | June |
By year
Seasonality
1Feb
2Mar
1Apr
5May
3Jun
10Jul
7Aug
1Sep
0Oct
0Nov
1Dec
0
Recorded events
All 31 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 |
|---|---|---|---|---|---|---|---|
| 5 Jun 2024 | Flash Flood | — | — | — | — | — | County |
| 18 May 2020 | Flood | — | — | — | — | — | County |
| 28 Mar 2020 | Flood | — | — | — | — | — | County |
| 3 Jul 2019 | Flash Flood | — | $2K | — | — | — | County |
| 3 Apr 2018 | Flood | — | $4K | — | — | — | County |
| 15 Feb 2018 | Flood | — | $25K | — | — | — | County |
| 18 Nov 2017 | Flood | — | $50K | — | — | — | County |
| 13 Jun 2017 | Flash Flood | — | — | — | — | — | County |
| 9 Jul 2013 | Flood | — | — | — | — | — | County |
| 8 Jul 2013 | Flood | — | $200K | — | — | — | County |
| 28 Feb 2011 | Flood | — | $400K | — | — | — | County |
| 21 Aug 2007 | Flood | — | $25K | — | — | — | County |
| 22 Jul 2006 | Flash Flood | — | $200K | — | — | — | County |
| 14 Jul 2006 | Flash Flood | — | — | — | — | — | County |
| 10 Jul 2006 | Flash Flood | — | $3.5M | — | — | — | County |
| 10 Jun 2005 | Flash Flood | — | $250K | — | — | — | County |
| 1 Jan 2005 | Flood | — | $750K | — | — | — | Forecast zone |
| 17 Jun 2004 | Flood | — | — | — | — | — | Forecast zone |
| 21 May 2004 | Flash Flood | — | $600K | — | — | — | County |
| 19 Apr 2002 | Flash Flood | — | — | — | — | — | County |
| 19 Apr 2002 | Flash Flood | — | — | — | — | — | County |
| 8 Apr 2000 | Flash Flood | — | — | — | — | — | County |
| 28 Jun 1998 | Flash Flood | — | $150K | — | — | — | County |
| 27 Jun 1998 | Flash Flood | — | $50K | — | — | — | County |
| 27 Jun 1998 | Flash Flood | — | $3.0M | $1.0M | — | — | County |
| 27 Jun 1998 | Flash Flood | — | $3.0M | $500K | — | — | County |
| 26 Jul 1997 | Flash Flood | — | $5K | — | — | — | County |
| 1 Jun 1997 | Flash Flood | — | $25K | $15K | — | — | County |
| 1 Jun 1997 | Flash Flood | — | $40K | $15K | — | — | County |
| 11 May 1996 | Flash Flood | — | — | — | — | — | County |
| 29 Apr 1996 | Flash Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has Knox County had?
31 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 Knox County?
5 Jun 2024 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Knox County?
The flash flood of 27 Jun 1998, with property damage estimated by NCEI at $3.0M and crop damage at $1.0M.
How does Knox County compare with Ohio for flood?
5.9 events per 100 square miles against 16.6 statewide; the county holds 31 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.