Active Weather Alerts
River Flood Warning
Issued: 3:43 PM Apr. 28, 2026 – National Weather Service
...FLOOD WARNING NOW IN EFFECT UNTIL TUESDAY, MAY 05... * WHAT...Moderate flooding is occurring and moderate flooding is forecast. * WHERE...Rock River near Lake Koshkonong. * WHEN...Until Tuesday, May 05. * 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 Tuesday the stage was 11.1 feet. - Bankfull stage is 9.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 10:00 AM CDT Tuesday was 11.2 feet. - Forecast...The river is expected to fall below flood stage Monday evening and continue falling to 9.9 feet Tuesday, May 05. - Flood stage is 10.0 feet. - Flood History...This crest compares to a previous crest of 11.2 feet on 07/31/2010. - 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 Wed Thu Fri Sat Lake Koshkonong 10.0 9.0 11.12 10 am 4/28 11.0 10.9 10.7 10.5 - 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 Lake Koshkonong 11.42 3 pm 4/24 -0.08 11.10 1 am 4/29 &&
River Flood Warning
Issued: 3:42 PM Apr. 28, 2026 – National Weather Service
...FLOOD WARNING NOW IN EFFECT UNTIL EARLY SATURDAY AFTERNOON... * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River at Fort Atkinson. * WHEN...Until early Saturday afternoon. * IMPACTS...At 17.0 feet, Floodwaters are in the back yards of some homes on Rogers Street on the northeast side of Fort Atkinson and water surrounds a few homes and businesses at the end of Vets Lane near the intersection of Hwy 106 and Blackhawk Island Rd. These roads are flooded in the Fort Atkinson area: Sinissippi Drive, Vets Ln, Fox Hill Rd, Bark River Road from Kutz Road to Rock River Road, Rock River Rd from Milwaukee Ave E to Hwy 106, North Shore Rd, Ralph Rd. The river walkway in Fort Atkinson becomes flooded. * ADDITIONAL DETAILS... - At 10:00 AM CDT Tuesday the stage was 16.9 feet. - Bankfull stage is 14.5 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 10:00 AM CDT Tuesday was 16.9 feet. - Forecast...The river is expected to fall below flood stage Saturday morning and continue falling to 15.1 feet Tuesday, May 05. - Flood stage is 16.0 feet. - Flood History...This crest compares to a previous crest of 16.8 feet on 10/12/2019. - 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 Wed Thu Fri Sat Fort Atkinson 16.0 14.5 16.85 10 am 4/28 16.6 16.4 16.2 15.9 - 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 17.4 2 pm 4/21 -0.09 16.80 7 pm 4/28 &&
River Flood Warning
Issued: 3:42 PM Apr. 28, 2026 – National Weather Service
...FLOOD WARNING NOW IN EFFECT UNTIL EARLY FRIDAY MORNING... * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River at Jefferson. * WHEN...Until early Friday morning. * IMPACTS...At 11.0 feet, Floodwaters affect low lying areas of residential and business property in Jefferson. Water approaches the intersection of Highway 26 (Main St) and County Road N (E Dane St). S Center Ave near the river flooded and Riverview Drive near the wastewater plant flooded. Park is flooded. The retention pond at S Main St and E Dane St is full. * ADDITIONAL DETAILS... - At 10:00 AM CDT Tuesday the stage was 10.6 feet. - Bankfull stage is 8.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 10:00 AM CDT Tuesday was 10.8 feet. - Forecast...The river is expected to fall below flood stage Thursday evening and continue falling to 8.3 feet Tuesday, May 05. - Flood stage is 10.0 feet. - Flood History...This crest compares to a previous crest of 10.6 feet on 10/13/2018. - 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 Wed Thu Fri Sat Jefferson 10.0 8.0 10.61 10 am 4/28 10.4 10.1 9.8 9.4 - 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 11.6 10 am 4/21 -0.12 10.60 7 pm 4/28 &&
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