Active Weather Alerts
River Flood Warning
Issued: 3:27 PM Apr. 30, 2026 – National Weather Service
...FLOOD WARNING NOW IN EFFECT UNTIL TOMORROW MORNING... * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River at Jefferson. * WHEN...Until tomorrow morning. * IMPACTS...At 10.0 feet, Water affects low lying areas of residential property in the City of Jefferson. Rock River Park and boat launch is affected near Hwy B in Johnson Creek. * ADDITIONAL DETAILS... - At 10:00 AM CDT Thursday the stage was 10.2 feet. - Bankfull stage is 8.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 10:00 AM CDT Thursday was 10.4 feet. - Forecast...The river is expected to fall below flood stage just after midnight tonight and continue falling to 7.3 feet Thursday, May 07. - Flood stage is 10.0 feet. - Flood History...This crest compares to a previous crest of 10.3 feet on 04/05/2007. - http://www.weather.gov/safety/flood && River forecasts are available for some but not all river gaging locations. The 7 day river forecast takes into account past precipitation, soil moisture conditions, and predicted precipitation for the basin. Precipitation is for the next 24 hours in the future from April through September and for 48 hours in the future from October through March. (Stages in ft.) Bank- Latest Forecast stages - Flood full observed ...for 1 pm... Location stage stage stage/time Fri Sat Sun Mon Jefferson 10.0 8.0 10.21 10 am 4/30 9.8 9.4 9.0 8.6 - Highest 24 hour change - observed in river stage - stage in (ft.) up to Highest stage - the last latest observed forecast in - 7 days stage next 7 days Jefferson 11.42 12 pm 4/23 -0.18 10.10 7 pm 4/30 &&
River Flood Warning
Issued: 3:27 PM Apr. 30, 2026 – National Weather Service
...FLOOD WARNING REMAINS IN EFFECT UNTIL EARLY SUNDAY MORNING... * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River at Fort Atkinson. * WHEN...Until early Sunday morning. * IMPACTS...At 16.5 feet, In the Fort Atkinson area, the following roads are impacted: Sinnissippi Drive, Bark River Road from Kutz Road to Rock River Road, and Rock River Road from Highway 106 to the Fort Atkinson city limits. Water is in park land near the river in Fort Atkinson. * ADDITIONAL DETAILS... - At 10:00 AM CDT Thursday the stage was 16.5 feet. - Bankfull stage is 14.5 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 10:00 AM CDT Thursday was 16.7 feet. - Forecast...The river is expected to fall below flood stage Saturday evening and continue falling to 14.7 feet Thursday, May 07. - Flood stage is 16.0 feet. - Flood History...This crest compares to a previous crest of 16.4 feet on 03/18/2009. - http://www.weather.gov/safety/flood && River forecasts are available for some but not all river gaging locations. The 7 day river forecast takes into account past precipitation, soil moisture conditions, and predicted precipitation for the basin. Precipitation is for the next 24 hours in the future from April through September and for 48 hours in the future from October through March. (Stages in ft.) Bank- Latest Forecast stages - Flood full observed ...for 1 pm... Location stage stage stage/time Fri Sat Sun Mon Fort Atkinson 16.0 14.5 16.51 10 am 4/30 16.3 16.1 15.8 15.5 - Highest 24 hour change - observed in river stage - stage in (ft.) up to Highest stage - the last latest observed forecast in - 7 days stage next 7 days Fort Atkinson 17.36 2 pm 4/23 -0.15 16.50 1 pm 4/30 &&
River Flood Warning
Issued: 3:27 PM Apr. 30, 2026 – National Weather Service
...FLOOD WARNING REMAINS IN EFFECT UNTIL TUESDAY MORNING... * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River near Lake Koshkonong. * WHEN...Until Tuesday morning. * IMPACTS...At 11.0 feet, In the Town of Lake Koshkonong, floodwaters affect Vets Lane, Blackhawk Island Road, and Oxbow Bend Road. There is widespread flooding of roads and docks in the Town of Koshkonong and Town of Sumner including Vets Lane, Blackhawk Island Road and Oxbow Bend Road. * ADDITIONAL DETAILS... - At 10:00 AM CDT Thursday the stage was 10.9 feet. - Bankfull stage is 9.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 10:00 AM CDT Thursday was 11.0 feet. - Forecast...The river is expected to fall below flood stage early Tuesday morning and continue falling to 9.4 feet Thursday, May 07. - Flood stage is 10.0 feet. - Flood History...This crest compares to a previous crest of 11.0 feet on 10/15/2019. - http://www.weather.gov/safety/flood && River forecasts are available for some but not all river gaging locations. The 7 day river forecast takes into account past precipitation, soil moisture conditions, and predicted precipitation for the basin. Precipitation is for the next 24 hours in the future from April through September and for 48 hours in the future from October through March. (Stages in ft.) Bank- Latest Forecast stages - Flood full observed ...for 1 pm... Location stage stage stage/time Fri Sat Sun Mon Lake Koshkonong 10.0 9.0 10.85 10 am 4/30 10.7 10.5 10.4 10.1 - Highest 24 hour change - observed in river stage - stage in (ft.) up to Highest stage - the last latest observed forecast in - 7 days stage next 7 days Lake Koshkonong 11.42 3 pm 4/24 -0.16 10.80 1 am 5/01 &&
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