Flood in Jefferson County, Wisconsin
Flood May 1, 2026 – May 4, 2026 · Jefferson County, Wisconsin
Where the report was made, with tornadoes recorded within 15 miles over the years.
What the National Weather Service wrote
The Rock River at Lake Koshkonong continued to have impacts from high water. Floodwaters reached Oxbow Bend Road in the area of the gauge on the east side of the lake. The following roads were flooded: the end of Road 9, end of Road 8 St, end of E Road 7, Lakeview Dr, Charley Bluff Rd north of Royce Dallman Park, parts of Lamp Rd, Willow Rd, parts of Blackhawk Island Rd. Water surrounded some structures on Lamp Rd and toward the end of Blackhawk Island Rd. Low lying areas of Lakeland Campground and Altpeter County Park flooded. There was water into yards along High Ridge Rd. Homes and docks in the Blackhawk Island area on the north side of Lake Koshkonong were affected by floodwaters.
The wider storm
The river flooding that began from the heavy rainfall in mid April continued into early May for portions of the Rock River.
Began near Busseyville (42.9300, -88.9400).
Source: NOAA Storm Events Database, event 1342869. Narratives are written by the National Weather Service forecast office that issued the report.
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