3,198
Recorded events
88
Counties affected
43
Direct deaths
$1.5B
Property damage
Ohio flash flood history: 3,198 recorded events across 88 counties between 1996 and 2026.
Decade by decade
Ohio flash flood history by decade
The 2010s are the busiest decade on record with 976 reported flash flood events across Ohio. Earlier decades are thinner because systematic reporting for this hazard expanded over time, not because the weather was calmer.
County ranking
Counties with the most flash flood events in Ohio
| Rank | County | Events | Deaths | Damage | Span |
|---|---|---|---|---|---|
| #1 | Hamilton County | 146 | 3 | $13.4M | 1996–2024 |
| #2 | Belmont County | 98 | 1 | $7.5M | 1996–2025 |
| #3 | Cuyahoga County | 97 | 0 | $98.0M | 1996–2025 |
| #4 | Clermont County | 88 | 0 | $2.4M | 1996–2025 |
| #5 | Scioto County | 74 | 1 | $5.1M | 1996–2025 |
| #6 | Coshocton County | 70 | 0 | $5.4M | 1996–2024 |
| #7 | Tuscarawas County | 68 | 0 | $20.2M | 1996–2025 |
| #8 | Franklin County | 67 | 1 | $1.6M | 1996–2025 |
| #9 | Warren County | 64 | 0 | $3.5M | 1996–2025 |
| #10 | Lorain County | 62 | 2 | $55.9M | 1996–2024 |
| #11 | Butler County | 61 | 1 | $3.5M | 1996–2026 |
| #12 | Adams County | 60 | 3 | $10.0M | 1996–2025 |
| #13 | Brown County | 58 | 4 | $6.2M | 1996–2025 |
| #14 | Noble County | 55 | 5 | $10.3M | 1996–2025 |
| #15 | Summit County | 54 | 4 | $170.0M | 1996–2024 |
| #16 | Muskingum County | 54 | 0 | $10.4M | 1996–2025 |
| #17 | Athens County | 53 | 1 | $5.5M | 1996–2025 |
| #18 | Stark County | 49 | 0 | $63.5M | 1996–2024 |
| #19 | Monroe County | 48 | 1 | $8.1M | 1996–2024 |
| #20 | Highland County | 48 | 0 | $603K | 1996–2025 |
| #21 | Montgomery County | 47 | 0 | $425K | 1996–2025 |
| #22 | Columbiana County | 47 | 0 | $5.0M | 1996–2023 |
| #23 | Lawrence County | 44 | 0 | $17.6M | 1996–2025 |
| #24 | Vinton County | 44 | 0 | $4.0M | 1996–2025 |
| #25 | Gallia County | 42 | 0 | $4.8M | 1996–2025 |
Significant events
Deadliest flash flood events in Ohio
| Date | County | Scale | Deaths | Injuries |
|---|---|---|---|---|
| Jun 28, 1998 | Noble County | — | 5 | 0 |
| Jul 18, 2001 | Hamilton County | — | 3 | 0 |
| Jul 19, 2015 | Brown County | — | 3 | 3 |
| Jul 21, 2003 | Summit County | — | 3 | 0 |
| Jan 22, 1999 | Fairfield County | — | 2 | 1 |
| Mar 20, 2020 | Harrison County | — | 2 | 0 |
| Mar 1, 1997 | Adams County | — | 2 | 0 |
| Jul 16, 2005 | Lorain County | — | 2 | 0 |
| Jul 10, 2013 | Summit County | — | 1 | 0 |
| May 4, 2024 | Adams County | — | 1 | 0 |