154
Recorded events
5
Direct deaths
10
Direct injuries
$35.5M
Property damage
Flash Flood in Williamson County, Texas: 154 recorded events between 1996 and 2026. The strongest on record measured 0. That places the county #71 nationally and #10 statewide for this hazard.
Decade by decade
Flash Flood in Williamson County, Texas: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for flash flood in Williamson County is the 2010s, when 62 of the county's 154 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 Williamson County archive, flash flood makes up 17.3% of all recorded severe weather across 8 hazard types. Nationally the county sits at #71 for this hazard and #10 within Texas, putting it in the 97.7 percentile of all U.S. counties.
Seasonality
Events by month
Sep is the peak month for flash flood in Williamson County with 33 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 |
|---|---|---|---|---|---|
| Nov 15, 2001 | COUNTYWIDE | 0 | 2 | 10 | $500K |
| May 25, 2015 | HUTTO | 0 | 1 | 0 | $7.0M |
| Sep 8, 2010 | GEORGETOWN MUNI ARPT | 0 | 1 | 0 | $0 |
| Mar 14, 2007 | LIBERTY HILL | 0 | 1 | 0 | $0 |
Most recent
Latest recorded events
| Date | Location | Magnitude | Damage |
|---|---|---|---|
| Apr 21, 2026 | GEORGETOWN MUNI ARPT | — | $0 |
| Jul 5, 2025 | LIBERTY HILL | 0 | $0 |
| Jul 5, 2025 | LEANDER | 0 | $0 |
| Jul 5, 2025 | LEANDER | 0 | $0 |
| Jul 5, 2025 | LEANDER | 0 | $0 |
| Jul 5, 2025 | ANDICE | 0 | $25.0M |
| Jul 5, 2025 | LIBERTY HILL | 0 | $0 |
| Jul 5, 2025 | LIBERTY HILL | 0 | $0 |
| May 6, 2025 | GRANGER | 0 | $0 |
| May 6, 2025 | WHITE STONE | 0 | $0 |
Other hazards here
More from Williamson County
- Hail 445
- Thunderstorm Wind 200
- Tornado 71
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
Thunderstorms produced heavy rain that caused flash flooding around the county. Numerous roads were closed including Hairy Man Rd. The Bull Run Creek hike and bike trail was flooded. A 55 year old man died when his vehicle was swept away near CR 143 and Hwy 195 north of Georgetown. 38 homes were destroyed and 57 homes sustained major damage. Losses for infrastructure totaled more than 7 million dollars.
Heavy rain from Tropical Storm Hermine produced flash flooding which closed I-35 in both directions in Georgetown which caused one death. A man was found dead in a drainage field on September 14th. Police believe on September 8th at around 2am he was forced to stop his car because I-35 was closed with several feet of water over the highway. He pulled off on an exit ramp and discovered it was also flooded. Relatives said that he called them and said he couldn���t get home but was going to check the depth of the water. He got out of his vehicle and tried to walk through the flooded water to determine its depth and apparently was sucked down through a drainage culvert. The flooding also caused the evacuation of approximately 100 homes along Brushy Creek near Round Rock.
CR258, CR268, CR305 were all closed due to high water, among many others. A husband and wife were driving home in the Georgetown area near 1920 pm CST. Their vehicle stalled in high water in Berry Creek. Rescuers reached the couple and attempted to bring them to safety, both were swept downstream. The woman was successfully rescued but the man drowned.
Quick answers
Frequently asked
How many flash flood events are on record in Williamson County, Texas?
154 flash flood events are recorded in Williamson County between 1996 and 2026, causing 5 direct deaths.
What is the strongest flash flood recorded in Williamson County?
The strongest flash flood on record in Williamson County measured 0.
Where does the flash flood data for Williamson 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 Williamson County, Texas.” Severe Weather History. severeweatherhistory.com/county/texas/williamson-county/flash-flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.