I-39/90 Expansion Project

Illinois state line to Madison, Dane and Rock counties

County N interchange

As part of the I-39/90 Expansion Project, the Wisconsin Department of Transportation (WisDOT) will reconstruct the I-39/90 and County N interchange, near Stoughton, into a diamond interchange with three roundabouts, in order to improve safety, efficiency and reduce overall congestion in the area.

Download the County N interchange brochurePDF

WisDOT created a narrated animation video, which shows two major movements at the interchange and demonstrates how to safely navigate the new interchange.