Headline:
Flood Warning issued May 5 at 2:32AM CDT until May 6 at 1:00PM CDT by NWS Milwaukee/Sullivan WI
Event:
Flood Warning
Urgency:
Immediate
Effective:
May 5, 2026 - 12:32am
Expires:
May 5, 2026 - 12:45pm
Description:
...The Flood Warning continues for the following rivers in
Wisconsin...Illinois...
Rock River Near Lake Koshkonong affecting Jefferson and Rock
Counties.
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 tomorrow 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 2:00 AM CDT Tuesday the stage was 10.1 feet.
- Bankfull stage is 9.0 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 2:00 AM CDT Tuesday was 10.3 feet.
- Forecast...The river is expected to fall below flood stage
tomorrow morning and continue falling to 9.0 feet Monday
evening.
- 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 this afternoon at 245 PM CDT.
Area Description:
Jefferson, WI; Rock, WI
Forcast Office:
NWS Milwaukee/Sullivan WI