65
Recorded events
0
Direct deaths
0
Direct injuries
$3.2M
Property damage
Flood in Grant County, Wisconsin: 65 recorded events between 1998 and 2026. The strongest on record measured 0. That places the county #160 nationally and #4 statewide for this hazard.
Decade by decade
Flood in Grant County, Wisconsin: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for flood in Grant County is the 2010s, when 54 of the county's 65 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 Grant County archive, flood makes up 7.9% of all recorded severe weather across 8 hazard types. Nationally the county sits at #160 for this hazard and #4 within Wisconsin, putting it in the 94.5 percentile of all U.S. counties.
Seasonality
Events by month
Jul is the peak month for flood in Grant County with 11 recorded events, while May 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 18, 2026 | MUSCODA | — | $0 |
| Aug 19, 2025 | ROCKVILLE | 0 | $0 |
| Feb 27, 2023 | BURTON | 0 | $0 |
| Oct 2, 2019 | CASSVILLE MUNI ARPT | 0 | $10K |
| Oct 2, 2019 | BURTON | 0 | $0 |
| Oct 2, 2019 | ROCKVILLE | 0 | $0 |
| Sep 19, 2019 | BURTON | 0 | $0 |
| Sep 19, 2019 | ROCKVILLE | 0 | $0 |
| Sep 15, 2019 | BURTON | 0 | $0 |
| Sep 15, 2019 | FIVE PTS | 0 | $5K |
Other hazards here
More from Grant County
- Thunderstorm Wind 331
- Hail 252
- Flash Flood 69
- Tornado 55
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
The Grant County Emergency Manager reported that U.S. Highway 151 was closed at the SW Road interchange. County Road B was also closed for a while. County Road O sustained substantial damage and was likely closed for around a week. County Road U sustained shoulder damage. Water was also over SW Road near the intersection with Pioneer Road in the southwest part of the city of Platteville. Newspaper articles indicate at least 90 homes throughout the county were damaged by the flooding. Some of the homes had water at least 5 feet above ground level. A two day rainfall total of 9.25 inches was measured at 6 a.m. CST on July 24th in Dickeyville. A three day rainfall total of 8.96 inches in Rockville was measured at 6 a.m. CST July 24th.
Runoff from excessive rainfall caused significant flooding of several homes and businesses. In fact, there were approximately 70 homes which suffered damage to flood waters. Some of the locations which were hardest hit included Lancaster, Platteville, Ellenboro, Glenn Haven, Cassville and Potosi. Even a week after the heavy rains, some roads and bridges remained closed due to washouts and effects of debris hitting these structures. In addition, some farm fields remained unusable due to erosion or standing water. Grant County has been hit by major flooding in 2002, 2004, 2007 and 2008.
Widespread rainfall amounts of 2 to 3 inches fell in two hours across much of the eastern half of Grant County. Many roads throughout the county were underwater and closed temporarily, including U.S. Highway 151 near Platteville. Damage did occur to some roads as well as to homes and businesses. The cities that had the worst impacts included Boscobel, Fennimore, Livingston, Cuba City, Kieler, and Hazel Green.
Quick answers
Frequently asked
How many flood events are on record in Grant County, Wisconsin?
65 flood events are recorded in Grant County between 1998 and 2026, causing 0 direct deaths.
What is the strongest flood recorded in Grant County?
The strongest flood on record in Grant County measured 0.
Where does the flood data for Grant 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 Grant County, Wisconsin.” Severe Weather History. severeweatherhistory.com/county/wisconsin/grant-county/flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.