Rock River at Jefferson, WI
River level and flood forecast · Jefferson County
The river is 4.8 ft below flood stage (10 ft).
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 6 PM. Forecasts change as rain falls and as upstream water arrives.
Get flood alerts for this river
An email when the National Weather Service forecasts Rock River at Jefferson to flood, when it floods, and when it's over.
Flood stages
| Major flood stage | 13 ft |
| Moderate flood stage | 11 ft |
| Flood stage | 10 ft |
| Action stage | 8 ft |
| Record crest (June 19, 2008) | 15.64 ft |
What floods at each level
From the National Weather Service, highest first.
- 15 ftFloodwaters cut the City of Jefferson in half. The Main Street and Wisconsin Drive bridges are closed to traffic due to flooding around the bridges. Main St and Hwy 26 intersection closed. S Center Ave near river flooded. Riverview Dr flooded.
- 12 ftRiverview Drive is closed due to floodwaters on the road. The Tensfeldt Park boat launch is closed. Intersection of S Main St and E Dane St is closed, and S Center Ave. Floodwaters affect highway K between Jefferson and Fort Atkinson. River's Edge Park flooded.
- 11.5 ftFloodwaters affect Highway K between Jefferson and Fort Atkinson. Floodwaters affect some low lying residences and businesses in Jefferson. Water on road at Hwy 26 (Main St) and Hwy N (E Dane St) and S Center Ave. Riverview Drive near the wastewater plant is flooded and closed.
- 11 ftFloodwaters 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.
- 10 ftWater 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. Goat Island is flooded.
- 9 ftThere is minor lowland flooding.
- 8 ftMinor lowland flooding occurs.
Highest crests on record
- 15.64 ft — June 19, 2008
- 12.84 ft — April 2, 1979
- 12.31 ft — April 20, 2013
- 12.29 ft — April 22, 1993
- 11.72 ft — September 8, 2018
Recent crests: 11.69 ft (April 20, 2026) · 10.14 ft (July 9, 2024) · 10.05 ft (June 30, 2024) · 10.47 ft (June 11, 2024) · 11 ft (October 12, 2019)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (JFFW3); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.