202
Recorded events
21
Counties affected
2
Direct deaths
$20.2M
Property damage
Washington flash flood history: 202 recorded events across 21 counties between 1996 and 2026.
Decade by decade
Washington flash flood history by decade
The 2010s are the busiest decade on record with 86 reported flash flood events across Washington. 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 Washington
| Rank | County | Events | Deaths | Damage | Span |
|---|---|---|---|---|---|
| #1 | Chelan County | 48 | 0 | $2.3M | 1997–2024 |
| #2 | Okanogan County | 40 | 1 | $4.3M | 1996–2023 |
| #3 | Spokane County | 15 | 0 | $1.6M | 1998–2022 |
| #4 | Yakima County | 14 | 0 | $7K | 2004–2015 |
| #5 | Whitman County | 13 | 0 | $2.3M | 1998–2026 |
| #6 | Stevens County | 8 | 0 | $525K | 1996–2022 |
| #7 | Grant County | 8 | 0 | $166K | 1998–2023 |
| #8 | Asotin County | 8 | 0 | $1.7M | 1998–2023 |
| #9 | Douglas County | 8 | 0 | $1.1M | 2010–2023 |
| #10 | Lincoln County | 7 | 0 | $65K | 1998–2014 |
| #11 | Ferry County | 6 | 0 | $3.5M | 1998–2019 |
| #12 | Pend Oreille County | 5 | 0 | $256K | 1998–2023 |
| #13 | Kittitas County | 5 | 0 | $92K | 1998–2014 |
| #14 | Skagit County | 5 | 0 | $307K | 2004–2024 |
| #15 | Walla Walla County | 3 | 0 | $1.3M | 2005–2012 |
| #16 | Garfield County | 2 | 0 | $0 | 2008–2022 |
| #17 | Columbia County | 2 | 0 | $0 | 2013–2022 |
| #18 | Benton County | 2 | 0 | $0 | 2017–2019 |
| #19 | Adams County | 1 | 0 | $0 | 2005–2005 |
| #20 | Snohomish County | 1 | 0 | $0 | 2017–2017 |
| #21 | King County | 1 | 1 | $750K | 2006–2006 |
Significant events
Deadliest flash flood events in Washington
| Date | County | Scale | Deaths | Injuries |
|---|---|---|---|---|
| Dec 15, 2006 | King County | — | 1 | 0 |
| Jul 13, 2001 | Okanogan County | — | 1 | 0 |