Headline:
Flood Warning issued April 18 at 10:06AM CDT by NWS Milwaukee/Sullivan WI
Event:
Flood Warning
Urgency:
Immediate
Effective:
April 18, 2026 - 8:06am
Expires:
April 18, 2026 - 8:15pm
Description:
...The Flood Warning is extended for the following rivers in
Wisconsin...
Baraboo River Near Baraboo affecting Sauk and Columbia Counties.
Pecatonica River At Martintown affecting Green County.
Wisconsin River At Portage affecting Columbia County.
...The Flood Warning continues for the following rivers in
Wisconsin...Illinois...
Root River At Racine affecting Racine County.
Sheboygan River At Sheboygan affecting Sheboygan County.
Rock River Near Lake Koshkonong affecting Rock and Jefferson
Counties.
Rock River At Fort Atkinson affecting Jefferson County.
Rock River At Afton affecting Rock and Winnebago 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.
Fox River Near Berlin affecting Green Lake County.
Crawfish River At Milford affecting Jefferson County.
Fox River Lower At Waukesha affecting Waukesha County.
Fox River Lower Near New Munster affecting Lake and Kenosha
Counties.
Milwaukee River Near Cedarburg affecting Ozaukee County.
Root River Canal At Raymond affecting Racine County.
...Observed flooding changed from Minor to Moderate severity and
increased in duration for the following rivers in Illinois...
Wisconsin...
Sugar River At Brodhead affecting Rock, Winnebago and Green
Counties.
* WHAT...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 8:00 AM CDT Saturday the stage was 10.0 feet.
- Bankfull stage is 9.0 feet.
- Forecast...The river is expected to rise to 12.2 feet
Thursday morning. Additional rises are possible thereafter.
- Flood stage is 10.0 feet.
- Flood History...This crest compares to a previous crest of
12.2 feet on 04/25/1993.
- http://www.weather.gov/safety/flood
Instruction:
Motorists should not attempt to drive around barricades or drive
cars through flooded areas.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
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.
Additional information is available at www.weather.gov.
The next statement will be issued this evening at 1015 PM CDT.
Area Description:
Jefferson, WI; Rock, WI
Forcast Office:
NWS Milwaukee/Sullivan WI