Headline:
Flood Warning issued April 19 at 10:08PM CDT by NWS Milwaukee/Sullivan WI
Event:
Flood Warning
Urgency:
Immediate
Effective:
April 19, 2026 - 8:08pm
Expires:
April 20, 2026 - 8:15am
Description:
...The Flood Warning is extended for the following rivers in
Illinois...Wisconsin...
Sugar River At Brodhead affecting Winnebago, Rock and Green
Counties.
...The Flood Warning continues for the following rivers in
Wisconsin...Illinois...
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 At Watertown affecting Jefferson County.
ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County.
Crawfish River At Milford affecting Jefferson County.
* WHAT...Minor flooding is occurring and moderate to near major
flooding is forecast.
* WHERE...Rock River near Lake Koshkonong.
* WHEN...Until further notice.
* 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 Sunday the stage was 10.7 feet.
- Bankfull stage is 9.0 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 9:00 PM CDT Sunday was 10.7 feet.
- Forecast...The river is expected to rise to a crest of 11.5
feet early Wednesday afternoon.
- Flood stage is 10.0 feet.
- Flood History...This crest compares to a previous crest of
11.5 feet on 03/25/2019.
- http://www.weather.gov/safety/flood
Instruction:
Even 6 inches of fast-moving flood water can knock you off your feet
and a depth of 2 feet will float your car. Never try to walk, swim,
or drive through such swift water. If you come upon flood waters,
stop, turn around and go another way.
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 Monday morning at 1015 AM CDT.
Area Description:
Jefferson, WI; Rock, WI
Forcast Office:
NWS Milwaukee/Sullivan WI