40
Recorded events
1
Direct deaths
0
Direct injuries
$4.3M
Property damage
Flash Flood in Okanogan County, Washington: 40 recorded events between 1996 and 2023. The strongest on record measured 0. That places the county #826 nationally and #2 statewide for this hazard.
Decade by decade
Flash Flood in Okanogan County, Washington: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for flash flood in Okanogan County is the 2010s, when 16 of the county's 40 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 Okanogan County archive, flash flood makes up 17.3% of all recorded severe weather across 10 hazard types. Nationally the county sits at #826 for this hazard and #2 within Washington, putting it in the 72.5 percentile of all U.S. counties.
Seasonality
Events by month
Jul is the peak month for flash flood in Okanogan County with 17 recorded events, while Jan 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 |
|---|---|---|---|---|---|
| Jul 13, 2001 | OROVILLE | 0 | 1 | 0 | $1.5M |
Most recent
Latest recorded events
| Date | Location | Magnitude | Damage |
|---|---|---|---|
| Jul 13, 2023 | WINTHROP | 0 | $5K |
| Aug 22, 2022 | MAZAMA ARPT | 0 | $1K |
| Jul 5, 2022 | MAZAMA | 0 | $50K |
| Jul 4, 2022 | CONCONULLY | 0 | $1.0M |
| Jun 5, 2022 | KOOTZVILLE | 0 | $10K |
| Jun 3, 2022 | OLD TORODA | 0 | $400K |
| Jul 22, 2016 | TWISP ARPT | 0 | $5K |
| Jul 22, 2016 | METHOW | 0 | $1K |
| Jul 22, 2016 | BREWSTER | 0 | $1K |
| Jul 22, 2016 | METHOW | 0 | $1K |
Other hazards here
More from Okanogan County
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
Evacuations ongoing along the north fork Salmon Creek road, with the bridge on north side of town overtopped with water. Several people are trapped in Kerr campground from flash flooding of the north fork of the Salmon river. North fork salmon creek road washed out in multiple locations from flash flooding. Sinlahekin road flooded and impassable. Road washed out near Salmon Meadows campground from flash flooding. |Reports of at least 25 residences inundated with water. A cabin under construction was destroyed from flood waters.
Heavy rain over the Walker Creek Burn Scar created a debris flow. The radar estimated precipitation rates of 2-3.5 inches were observed close to the location of flash flooding on Bonaparte Lake Road. Three homes and several vehicles were damaged. Power outage lasted around 4 hours.
Andrews creek flooded with water, mud, and debris covering west Chewuch road. people trapped near the Andrews creek trail area. Wolf creek road flooded with rocks, mud, and debris on the road. Goat creek road flooded with rocks and debris on the roadway. Doe creek out of its banks with flooding of roads reported. Reports of a horse trailer stuck in debris from flash flooding between Falls Creek and Chewuch campgrounds. Rock, mud, and debris on roads in the Twisp River Valley, including adjacent to the Little Bridge Creek and on Thompson road, from flash flooding. |Vehicle stuck in mud and flood waters near Eight Mile Creek on a forest service road. the road was impassable from flash flooding.
Quick answers
Frequently asked
How many flash flood events are on record in Okanogan County, Washington?
40 flash flood events are recorded in Okanogan County between 1996 and 2023, causing 1 direct deaths.
What is the strongest flash flood recorded in Okanogan County?
The strongest flash flood on record in Okanogan County measured 0.
Where does the flash flood data for Okanogan 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 Okanogan County, Washington.” Severe Weather History. severeweatherhistory.com/county/washington/okanogan-county/flash-flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.