Jefferson County
River Flood Warning until TUE 1:00 PM CDT
Issued May, 01 2026 at 11:09 AM - US/Central expires May, 05 2026 at 1:00 PM - US/Central
...FLOOD WARNING NOW IN EFFECT UNTIL EARLY TUESDAY AFTERNOON...
* WHAT...Minor flooding is occurring and minor flooding is forecast.
* WHERE...Rock River near Lake Koshkonong.
* WHEN...Until early Tuesday afternoon.
* IMPACTS...At 10.5 feet, Floodwaters reach Oxbow Bend Road in the
area of the gage on the east side of the lake.
* ADDITIONAL DETAILS...
- At 10:00 AM CDT Friday the stage was 10.7 feet.
- Bankfull stage is 9.0 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 10:00 AM CDT Friday was 10.9 feet.
- Forecast...The river is expected to fall below flood stage
Tuesday morning and continue falling to 9.3 feet Friday, May
08.
- Flood stage is 10.0 feet.
- Flood History...This crest compares to a previous crest of
10.6 feet on 04/07/2007.
- 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 Sat Sun Mon Tue
Lake Koshkonong 10.0 9.0 10.72 10 am 5/01 10.5 10.3 10.1 9.9
- 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
Lake Koshkonong 11.42 3 pm 4/24 -0.13 10.70 7 pm 5/01
&&
