Illinois, Wisconsin Flood Warning | Effective 04/27/2026 03:12

Headline: 
Flood Warning issued April 27 at 5:12AM CDT by NWS Milwaukee/Sullivan WI
Event: 
Flood Warning
Urgency: 
Immediate
Effective: 
April 27, 2026 - 3:12am
Expires: 
April 27, 2026 - 3:15pm
Description: 
...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Rock River At Newville affecting Rock County. Rock River Near Lake Koshkonong affecting Rock and Jefferson Counties. Rock River At Fort Atkinson affecting Jefferson County. Rock River At Afton affecting Winnebago and Rock Counties. Rock River At Jefferson affecting Jefferson County. ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River at Afton. * WHEN...Until further notice. * IMPACTS...At 10.5 feet, Floodwaters affect Riverside Park on the north side of Janesville and South River Road on the south side of Janesville. Floodwaters affect low spots on South River Rd on the south side of Janesville. Floodwaters affect a home on South Christian Rd on the east side of the river in the Afton area. There is extensive lowland and agricultural land flooding in the Afton and Janesville areas. * ADDITIONAL DETAILS... - At 4:00 AM CDT Monday the stage was 10.6 feet. - Bankfull stage is 8.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 4:00 AM CDT Monday was 10.7 feet. - Forecast...The river is expected to rise to a crest of 10.6 feet this morning. - Flood stage is 9.0 feet. - Flood History...This crest compares to a previous crest of 10.6 feet on 04/12/1923. - http://www.weather.gov/safety/flood
Instruction: 
Motorists should not attempt to drive around barricades or drive cars through flooded areas. Caution is urged when walking near riverbanks. Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Additional information is available at www.weather.gov. The next statement will be issued this afternoon at 515 PM CDT.
Area Description: 
Winnebago, IL; Rock, WI
Forcast Office: 
NWS Milwaukee/Sullivan WI