Headline:
Flood Warning issued April 27 at 9:38PM CDT until May 4 at 1:00AM CDT by NWS Milwaukee/Sullivan WI
Event:
Flood Warning
Urgency:
Immediate
Effective:
April 27, 2026 - 7:38pm
Expires:
April 28, 2026 - 7:45am
Description:
...The Flood Warning continues for the following rivers in
Wisconsin...Illinois...
Rock River At Fort Atkinson affecting Jefferson County.
Fox River Lower Near New Munster affecting Lake and Kenosha
Counties.
Rock River At Newville affecting Rock County.
Rock River Near Lake Koshkonong affecting Jefferson and Rock
Counties.
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...Moderate flooding is occurring and moderate flooding is
forecast.
* WHERE...Rock River near Lake Koshkonong.
* WHEN...Until Monday, May 04.
* IMPACTS...At 11.3 feet, There is knee-deep water over Blackhawk
Island Road. Lamp Road on west side of river also becomes flooded.
Lake Koshkonong merges with Mud Lake to the east of Lake
Koshkonong.
* ADDITIONAL DETAILS...
- At 9:00 PM CDT Monday the stage was 11.2 feet.
- Bankfull stage is 9.0 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 9:00 PM CDT Monday was 11.3 feet.
- Forecast...The river is expected to fall below flood stage
Sunday evening and continue falling to 9.7 feet Monday, May
04.
- Flood stage is 10.0 feet.
- Flood History...This crest compares to a previous crest of
11.2 feet on 07/31/2010.
- http://www.weather.gov/safety/flood
Instruction:
Caution is urged when walking near riverbanks.
Motorists should not attempt to drive around barricades or drive
cars through flooded areas.
Additional information is available at www.weather.gov.
The next statement will be issued Tuesday morning at 945 AM CDT.
Area Description:
Jefferson, WI; Rock, WI
Forcast Office:
NWS Milwaukee/Sullivan WI