41
Recorded events
2
Direct deaths
0
Direct injuries
$472K
Property damage
Flash Flood in Harrison County, Ohio: 41 recorded events between 1996 and 2025. The strongest on record measured 0. That places the county #797 nationally and #28 statewide for this hazard.
Decade by decade
Flash Flood in Harrison County, Ohio: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for flash flood in Harrison County is the 2010s, when 14 of the county's 41 recorded events were logged. Comparing decades is useful for spotting active periods, but the earliest years are thin because systematic reporting for this hazard began later.
Within the Harrison County archive, flash flood makes up 15.2% of all recorded severe weather across 7 hazard types. Nationally the county sits at #797 for this hazard and #28 within Ohio, putting it in the 73.6 percentile of all U.S. counties.
Seasonality
Events by month
Apr is the peak month for flash flood in Harrison County with 11 recorded events, while Oct is the quietest. Seasonality here is a property of the archive as much as the climate: reports cluster where population and spotter networks are densest.
Significant events
Deadliest on record
| Date | Location | Scale | Deaths | Injuries | Damage |
|---|---|---|---|---|---|
| Mar 20, 2020 | UNIONVALE | 0 | 2 | 0 | $100K |
Most recent
Latest recorded events
| Date | Location | Magnitude | Damage |
|---|---|---|---|
| Jul 9, 2025 | BLAIRMONT | 0 | $0 |
| Jul 9, 2025 | EAST CADIZ | 0 | $0 |
| Apr 3, 2024 | BOWERSTON | 0 | $0 |
| Apr 3, 2024 | MOOREFIELD | 0 | $0 |
| Apr 3, 2024 | SMITHDALE | 0 | $0 |
| Apr 3, 2024 | FREEPORT | 0 | $0 |
| Mar 20, 2020 | UNIONVALE | 0 | $100K |
| Jul 11, 2019 | SMITHDALE | 0 | $1K |
| Jun 20, 2019 | CONOTTON | 0 | $0 |
| Jun 11, 2018 | CADIZ | 0 | $0 |
Other hazards here
More from Harrison County
- Thunderstorm Wind 169
- Hail 45
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
Another round of torrential rains over already saturated ground created flash flooding across the county on the evening of the 28th, continuing through the 30th. Most of the problems in the county were confined to water covering roadways, with the western portion of the county near Freeport and Tippecanoe having the most problems. Several buildings received damage from the flood waters, most of them mobile homes. The county also sustained significant agricultural losses from standing flood water in fields.
County roads flooded between Bowerstown and Deersville. Water began to recede after 9 PM EDT and was expected to return to normal by midnight. The flash flood damaged roads (such as routes 8 and 39), culverts, camp sites, and boat docks around Tappan Lake. A bridge was washed out on Route 8.
Quick answers
Frequently asked
How many flash flood events are on record in Harrison County, Ohio?
41 flash flood events are recorded in Harrison County between 1996 and 2025, causing 2 direct deaths.
What is the strongest flash flood recorded in Harrison County?
The strongest flash flood on record in Harrison County measured 0.
Where does the flash flood data for Harrison County come from?
All events come from the NOAA/NCEI Storm Events Database, the federal public-domain archive of severe weather reports. Dates are UTC, damage is as reported and not inflation-adjusted, and the most recent entries may still be revised.
Cite this page
“Flash Flood in Harrison County, Ohio.” Severe Weather History. severeweatherhistory.com/county/ohio/harrison-county/flash-flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.