Headline:
Flood Warning issued May 4 at 9:18PM CDT until May 6 at 1:00PM CDT by NWS Milwaukee/Sullivan WI
Event:
Flood Warning
Urgency:
Immediate
Effective:
May 4, 2026 - 7:18pm
Expires:
May 5, 2026 - 7:30am
Description:
...The Flood Warning is extended for the following rivers in
Wisconsin...
Rock River Near Lake Koshkonong affecting Rock and Jefferson
Counties.
...The Flood Warning continues for the following rivers in
Wisconsin...Illinois...
Rock River At Afton affecting Winnebago and Rock Counties.
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 near Lake Koshkonong.
* WHEN...Until early Wednesday afternoon.
* IMPACTS...At 10.0 feet, Floodwaters affect homes and boat docks in
the Blackhawk Island area of Lake Koshkonong on the north side of
the lake. Floodwaters spread over low spots on Blackhawk Island
Road in the area where the Rock River enters the lake.
* ADDITIONAL DETAILS...
- At 8:00 PM CDT Monday the stage was 10.2 feet.
- Bankfull stage is 9.0 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 8:00 PM CDT Monday was 10.3 feet.
- Forecast...The river is expected to fall below flood stage
Wednesday morning and continue falling to 9.0 feet Monday,
May 11.
- Flood stage is 10.0 feet.
- Flood History...This crest compares to a previous crest of
10.1 feet on 03/30/2011.
- 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.
Additional information is available at www.weather.gov.
The next statement will be issued Tuesday morning at 930 AM CDT.
Area Description:
Jefferson, WI; Rock, WI
Forcast Office:
NWS Milwaukee/Sullivan WI