79
Recorded events
3
Direct deaths
0
Direct injuries
$43.1M
Property damage
Flash Flood in Grand County, Utah: 79 recorded events between 1997 and 2025. The strongest on record measured 0. That places the county #276 nationally and #5 statewide for this hazard.
Decade by decade
Flash Flood in Grand County, Utah: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for flash flood in Grand County is the 2010s, when 39 of the county's 79 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 Grand County archive, flash flood makes up 33.5% of all recorded severe weather across 10 hazard types. Nationally the county sits at #276 for this hazard and #5 within Utah, putting it in the 91.1 percentile of all U.S. counties.
Seasonality
Events by month
Aug is the peak month for flash flood in Grand County with 29 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 |
|---|---|---|---|---|---|
| Jun 21, 2024 | MOAB | 0 | 2 | 0 | $0 |
| Sep 28, 2014 | HARLEY DOME | 0 | 1 | 0 | $20K |
Most recent
Latest recorded events
| Date | Location | Magnitude | Damage |
|---|---|---|---|
| Sep 12, 2025 | CASTLE VALLEY | 0 | $30K |
| Sep 12, 2025 | MOAB | 0 | $3K |
| Aug 23, 2024 | MOAB | 0 | $0 |
| Jun 27, 2024 | MOAB | 0 | $0 |
| Jun 21, 2024 | MOAB | 0 | $0 |
| Aug 25, 2023 | CASTLE VALLEY | 0 | $0 |
| Oct 2, 2022 | MOAB | 0 | $5K |
| Oct 2, 2022 | POTASH | 0 | $26.0M |
| Aug 21, 2022 | MOAB | 0 | $250K |
| Aug 21, 2022 | MOAB | 0 | $9.5M |
Other hazards here
More from Grand County
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
Major flooding in Moab and Castle Valley from strong thunderstorm that produced very heavy rain across town, Mill Creek, North Mill Creek, Kane Creek and a drainage above Castle Valley. 1 inch of rain fell in 15 minutes for a rainrate of 4 inches per hour. 2 reported missing in Moab area with an abandoned vehicle discovered in Mill Creek drainage after flash flooding, 1 was found deceased and other assumed fatality but not found.
Flash flood waters at least four feet deep flowed down the normally dry Bittercreek Wash and swept away a jeep which had been driven into the flood waters where the Tabeguache Trail crosses the wash. The driver was able to get out of the vehicle and reach the bank while the passenger was trapped inside and drowned. The vehicle came to a stop about 200 feet downstream from the Tabeguache Trail crossing.
More than 50 people were stranded overnight in Grand County, Utah after heavy rain from severe thunderstorms wiped out a portion of Mineral Bottom Road which led to a remote boat ramp. The rain completed demolished a section of switchbacks with large boulders accumulating.
Quick answers
Frequently asked
How many flash flood events are on record in Grand County, Utah?
79 flash flood events are recorded in Grand County between 1997 and 2025, causing 3 direct deaths.
What is the strongest flash flood recorded in Grand County?
The strongest flash flood on record in Grand County measured 0.
Where does the flash flood data for Grand 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 Grand County, Utah.” Severe Weather History. severeweatherhistory.com/county/utah/grand-county/flash-flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.