Active Weather Alerts
River Flood Warning
Issued: 3:19 PM Apr. 23, 2026 – National Weather Service
...FLOOD WARNING REMAINS IN EFFECT UNTIL FURTHER NOTICE... * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River at Afton. * WHEN...Until further notice. * IMPACTS...At 11.1 feet, Floodwaters affect Riverside Park and a road in Riverside park on the north side of Janesville and South River Road on the south side of Janesville. Floodwaters affect low spots on South River Rd on the south side of Janesville. Floodwaters affect a home on South Christian Rd on the east side of the river in the Afton area. There is extensive lowland and agricultural land flooding in the Afton and Janesville areas. * ADDITIONAL DETAILS... - At 10:00 AM CDT Thursday the stage was 10.7 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 10.8 feet. - Forecast...The river is expected to rise to a crest of 10.9 feet early Saturday morning. - Flood stage is 9.0 feet. - Flood History...This crest compares to a previous crest of 11.0 feet on 06/01/2004. - 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 Afton 9.0 8.0 10.67 10 am 4/23 10.8 10.9 10.9 10.9 - 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 Afton 12.11 1 am 4/18 0.08 10.90 1 pm 4/29 &&
River Flood Warning
Issued: 3:19 PM Apr. 23, 2026 – National Weather Service
...FLOOD WARNING REMAINS IN EFFECT UNTIL FURTHER NOTICE... * WHAT...Minor flooding is occurring. * WHERE...Rock River at Newville. * WHEN...Until further notice. * IMPACTS...At 7.5 feet, Floodwaters surround some homes near East Mallwood Drive and are into yards and roads across eastern Newville. Floodwaters affect a riverside restaurant and its parking lot on the south side of the river. * ADDITIONAL DETAILS... - At 10:00 AM CDT Thursday the stage was 7.4 feet. - Bankfull stage is 5.5 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 10:00 AM CDT Thursday was 7.5 feet. - Forecast...No forecast is available for this location. - Flood stage is 6.5 feet. - Flood History...This crest compares to a previous crest of 7.3 feet on 10/15/2018. - 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 5 pm... Location stage stage stage/time Thu Fri Sat Sun Newville 6.5 5.5 7.42 10 am 4/23 not a forecast point - 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 Newville 7.46 7 am 4/23 0.00 Not Available &&
River Flood Warning
Issued: 3:19 PM Apr. 23, 2026 – National Weather Service
...FLOOD WARNING REMAINS IN EFFECT UNTIL FURTHER NOTICE... * 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 10:00 AM CDT Thursday the stage was 11.3 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 11.4 feet. - Forecast...The river is expected to fall to 11.0 feet Thursday, April 30. - 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 && 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 11.34 10 am 4/23 11.3 11.3 11.2 11.2 - 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 11.35 9 am 4/23 0.06 11.30 1 am 4/26 &&
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