41
Recorded events
0
Direct deaths
0
Direct injuries
$1.7M
Property damage
Flash Flood in Sioux County, Iowa: 41 recorded events between 1999 and 2025. The strongest on record measured 0. That places the county #797 nationally and #11 statewide for this hazard.
Decade by decade
Flash Flood in Sioux County, Iowa: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for flash flood in Sioux County is the 2010s, when 18 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 Sioux County archive, flash flood makes up 5.9% of all recorded severe weather across 8 hazard types. Nationally the county sits at #797 for this hazard and #11 within Iowa, putting it in the 73.6 percentile of all U.S. counties.
Seasonality
Events by month
Jun is the peak month for flash flood in Sioux County with 15 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.
Most recent
Latest recorded events
| Date | Location | Magnitude | Damage |
|---|---|---|---|
| Jul 30, 2025 | MAURICE | 0 | $0 |
| Jul 30, 2025 | ALTON | 0 | $0 |
| Jul 30, 2025 | CARNES | 0 | $0 |
| Jun 2, 2025 | HULL | 0 | $0 |
| Jun 22, 2024 | HULL | 0 | $0 |
| Jun 22, 2024 | SIOUX CENTER | 0 | $0 |
| Jun 21, 2024 | MATLOCK | 0 | $0 |
| Jun 21, 2024 | HULL | 0 | $0 |
| Aug 5, 2023 | BOYDEN | 0 | $0 |
| Aug 5, 2023 | BOYDEN | 0 | $0 |
Other hazards here
More from Sioux County
- Hail 256
- Thunderstorm Wind 223
- Flood 116
- Tornado 47
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
Water ponding in the area of Central Park overflowed roadways and entered the Sioux Center Fire Department building. Two homes suffered the collapse of basement walls from the high water. Water also inundated a transformer which cut off power to seven homes in the northwest part of town. Seven trailers were evacuated due to high water in Westbrook Village on the northwest edge of town. More than two dozen vehicles were stranded in high water. Damage costs are rough estimates.
A no travel advised order was put out with numerous roads under significant flowing water up to mid-vehicle depth, including 2nd Avenue SE near New Age Church and 4th Avenue SE near Children's Park. Property damage costs are rough estimates.
Another 3 to 5 inches of rainfall on top of a similar amount from the earlier afternoon resulted in water flowing across U.S. Highway 75 north of the junction of U.S. Highway 18. For a more comprehensive description of flood damage, please see other entries for areal and river flooding for Sioux County.
Quick answers
Frequently asked
How many flash flood events are on record in Sioux County, Iowa?
41 flash flood events are recorded in Sioux County between 1999 and 2025, causing 0 direct deaths.
What is the strongest flash flood recorded in Sioux County?
The strongest flash flood on record in Sioux County measured 0.
Where does the flash flood data for Sioux 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 Sioux County, Iowa.” Severe Weather History. severeweatherhistory.com/county/iowa/sioux-county/flash-flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.