Flash Floods Inundate Southeast Wisconsin, 9 Inches Of Rain Triggers Life-Threatening Situation

Last Updated:August 10, 2025, 19:19 IST

The Weather Service issued a flash flood warning for southeast Wisconsin on August 10, causing severe flooding in Milwaukee, Waukesha, Ozaukee, and Washington counties.

Flash Floods Inundate Southeast Wisconsin. (X/@AZ_Intel_)

The Weather Service has issued a flash flood warning for parts of southeast Wisconsin on August 10. The latest alert, covering southern Washington County and southern Ozaukee counties, has been issued until 8:15 a.m. as heavy rain slowly moves north. According to Country Herald, some areas have already received 5 to 9 inches of rainfall overnight, with additional downpours expected before sunrise.

Due to the severe flash floods that impacted the Milwaukee area, the Wisconsin State Fair was forced to close early on Saturday. Flooding affected multiple counties in southeast Wisconsin on Sunday morning, with videos online showing vehicles stranded in high water, fairgoers evacuating, and others enjoying the rain despite the conditions.

Taking to Facebook, the state fair said, “Attention Fairgoers! The State Fair Park is closing. Please use caution as you make your way to the nearest exit as safely as possible and follow the directions of the Fair Park staff and police as you exit."

Officials announced that Tunnel Entrance F was closed due to the storm and advised visitors to use the Main Stage or Turn 4 exits to reach the state fair parking lots.

Severe Flash Flood Warning In Wisconsin

The heavy rain caused the Root River to overflow along Cleveland Avenue, creating dangerous conditions for motorists and pedestrians. Photos and videos sent to TMJ4 from the state fairgrounds showed some vehicles nearly fully submerged and attendees wading through deep water.

Severe flooding swept across much of southeast Wisconsin from the evening of August 9 through the morning of August 10, with some parts of the metro area receiving over 6 inches of rain in the past 24 hours.

Anyone in an impacted area is advised not to travel unless fleeing a flooded area or following evacuation orders. In Wauwatosa, the Menomonee River overflowed its banks, damaging the 68th Street bridge. At its peak overnight, the river reached a height of 14 feet.

According to the Weather Service in Milwaukee/Sullivan, flash flood warnings remain in effect until at least 5:30 a.m. for Milwaukee, Waukesha, Ozaukee and Washington counties. Additional rainfall of 1 to 3 inches is possible, worsening already dangerous conditions. As of 10 p.m. Saturday, We Energies reports nearly 10,000 people in Milwaukee County are without power. In neighbouring Waukesha County, more than 8,000 customers are also experiencing outages.

Residents are advised to stay off the roads, avoid driving through flooded areas, and watch for basement flooding and rising creek levels. Flooding at night is particularly dangerous because of reduced visibility.

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