42°50'N / 88°55'W / Altitude 252 m / 16:34 2026/04/21, America/Chicago (UTC-5)
From: 2026/04/21, 15:58
To: 2026/04/22, 04:00
...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Crawfish River At Milford affecting Jefferson County. Rock River At Newville affecting Rock County. Rock River Near Lake Koshkonong affecting Jefferson and Rock 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 At Princeton affecting Green Lake County. Fox River Near Berlin affecting Green Lake County. Fox River Lower At Rochester affecting Racine County. Fox River Lower Near New Munster affecting Kenosha and Lake Counties. Wisconsin River At Portage affecting Columbia County. * WHAT...Moderate flooding is occurring and moderate 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 3:00 PM CDT Tuesday the stage was 11.2 feet. - Bankfull stage is 9.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 3:00 PM CDT Tuesday was 11.2 feet. - Forecast...The river is expected to rise to a crest of 11.3 feet early tomorrow afternoon. - Flood stage is 10.0 feet. - Flood History...This crest compares to a previous crest of 11.4 feet on 03/29/2009. - http://www.weather.gov/safety/flood
Jefferson, WI; Rock, WI
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.
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 late tonight at 400 AM CDT.
NWS Milwaukee/Sullivan WI
2026/04/21, 15:58