68
Recorded events
1
Direct deaths
0
Direct injuries
$1.8M
Property damage
Flash Flood in Carroll County, Maryland: 68 recorded events between 1996 and 2025. The strongest on record measured 0. That places the county #357 nationally and #9 statewide for this hazard.
Decade by decade
Flash Flood in Carroll County, Maryland: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for flash flood in Carroll County is the 2000s, when 22 of the county's 68 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 Carroll County archive, flash flood makes up 9.9% of all recorded severe weather across 9 hazard types. Nationally the county sits at #357 for this hazard and #9 within Maryland, putting it in the 88.3 percentile of all U.S. counties.
Seasonality
Events by month
Jul is the peak month for flash flood in Carroll County with 19 recorded events, while Feb 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 31, 2025 | MT AIRY | 0 | 1 | 0 | $0 |
Most recent
Latest recorded events
| Date | Location | Magnitude | Damage |
|---|---|---|---|
| Jul 31, 2025 | MORGAN | 0 | $0 |
| Jul 31, 2025 | MT AIRY | 0 | $0 |
| Jul 10, 2025 | MELROSE | 0 | $0 |
| Jul 10, 2025 | GUNPOWDER | 0 | $0 |
| Jul 9, 2025 | BACHMANS MILLS | 0 | $0 |
| Jul 9, 2025 | WOODBINE | 0 | $0 |
| Jul 9, 2025 | SYKESVILLE | 0 | $0 |
| Jul 9, 2025 | WOODSTOCK | 0 | $0 |
| Aug 9, 2024 | MILLERS | 0 | $0 |
| Aug 9, 2024 | MT AIRY | 0 | $0 |
Other hazards here
More from Carroll County
- Thunderstorm Wind 416
- Flood 73
- Hail 71
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
Gunpowder River out of it banks onto Grave Run Road around River Road Ranch. River Road Ranch inundated, with damage to buildings. Vehicles washed into and down the river from flash flooding. Spotter reported rainfall total of 6.46.
The water level on Cranberry Branch near Westminster rose to 5.9 feet in about 90 minutes, which is above the flood stage of 5 feet. Water approached basements and an access road was flooded as well. The Carroll County 911 Center also reported about a dozen calls for roads that were impassable due to high water.
The USGS stream gage on Gunpowder Falls near Hoffmanville exceeded the 6 foot flood stage during the indicated period. The peak level of 6.94 feet occurred at 11:45pm EST. River Valley Ranch reported some flooding in their area, with campers having to be moved inside due to floodwaters.
Quick answers
Frequently asked
How many flash flood events are on record in Carroll County, Maryland?
68 flash flood events are recorded in Carroll County between 1996 and 2025, causing 1 direct deaths.
What is the strongest flash flood recorded in Carroll County?
The strongest flash flood on record in Carroll County measured 0.
Where does the flash flood data for Carroll 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 Carroll County, Maryland.” Severe Weather History. severeweatherhistory.com/county/maryland/carroll-county/flash-flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.