58
Recorded events
0
Direct deaths
0
Direct injuries
$145K
Property damage
Flood in Rock County, Wisconsin: 58 recorded events between 1998 and 2026. The strongest on record measured 0. That places the county #197 nationally and #7 statewide for this hazard.
Decade by decade
Flood in Rock County, Wisconsin: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for flood in Rock County is the 2010s, when 36 of the county's 58 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 Rock County archive, flood makes up 7.9% of all recorded severe weather across 9 hazard types. Nationally the county sits at #197 for this hazard and #7 within Wisconsin, putting it in the 93.3 percentile of all U.S. counties.
Seasonality
Events by month
Apr is the peak month for flood in Rock County with 9 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 |
|---|---|---|---|
| Apr 19, 2026 | CHARLIE BLUFF | — | $1K |
| Apr 16, 2026 | LEYDEN | — | $1K |
| Apr 15, 2026 | CLINTON | — | $1K |
| Jun 30, 2025 | JANESVILLE AIRPORT | 0 | $1K |
| Jul 16, 2024 | EVANSVILLE | 0 | $1K |
| Jul 15, 2024 | AVON | 0 | $1K |
| Jul 15, 2024 | DOWNTOWN JANESVILLE | 0 | $1K |
| Jul 15, 2024 | DOWNTOWN JANESVILLE | 0 | $2K |
| Jun 3, 2024 | AVALON | 0 | $1K |
| Apr 3, 2024 | AVON | 0 | $2K |
Other hazards here
More from Rock County
- Thunderstorm Wind 375
- Hail 173
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
Widespread flooding of lowland and agricultural land countywide, including numerous road closures. Street flooding in Janesville and Beloit. Multiple vehicles stranded in high water. A gas station in Beloit was closed due to high water.
Many roads were flooded and closed in the Township of Avon due to the flooding of the Sugar River and due to lowland flooding. Portions of other roads were closed into central and northeast Rock Co., more specifically in the townships of Spring Valley, Rock, Plymouth, Fulton, and Johnstown due to lowland flooding and creek flooding. A portion of highway 51 was flooded and closed in Edgerton.
The Turtle Creek at Beloit reached moderate flood stage and crested at 11.70 feet. Floodwaters are in the back yards of some homes on Shopiere Road about 3 miles northeast of downtown Beloit, and on Arrowhead Drive and Luety Parkway. Colley Road is closed between Sager Lane and Sherwood Drive. Floodwaters surround a power substation on Colley Road in Beloit. Floodwaters are in the backyards of some homes on East Ridge Road, Moccasin Trail, and in the Turtle Creek subdivision. Parts of Bootmaker Drive and Moccasin Trail are flooded and closed. Parts of Athletic Avenue and Hancock Streets are closed. About 7 miles northeast of Beloit in the Town of Turtle, Sweet-Allyn Park on Highway J is flooded and closed. In the Town of Tiffany about 8 miles northeast of Beloit, floodwaters are in the back yards of some homes on East Creek Road.
Quick answers
Frequently asked
How many flood events are on record in Rock County, Wisconsin?
58 flood events are recorded in Rock County between 1998 and 2026, causing 0 direct deaths.
What is the strongest flood recorded in Rock County?
The strongest flood on record in Rock County measured 0.
Where does the flood data for Rock 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
“Flood in Rock County, Wisconsin.” Severe Weather History. severeweatherhistory.com/county/wisconsin/rock-county/flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.