I-39/90 Expansion Project

This project, going from County Road O to U.S. Highway 14 in Janesville, is part of the Wisconsin Department of Transportation’s reconstruction of a 45-mile stretch of Interstate 39/90 from the Illinois state line to Madison. The project rebuilt and widened I-39/90 in the Janesville area from four to eight lanes. It also included the construction of 10 bridges, six retaining walls, nine noise walls and two sign bridges, and the construction of a park-and-ride lot in the northeast corner of the interchange of Highway 11 and East Racine Street.

I-39/90 is projected to have a 2040 average annual daily traffic count of more than 94,000, of which about 38% will be made up of heavy trucks.

The reconstruction of I-39/90 in Dane and Rock counties is one of the largest highway projects undertaken in south-central Wisconsin. Widening the roadway will allow more motorists and trucks to conveniently travel the highway and increase economic activity in the entire region and beyond, as well as provide new opportunities for regional and national commerce.

WisDOT and consultant staff worked with Janesville officials to incorporate aesthetic elements in the project bridges, retaining walls and noise walls. Furthermore, extensive coordination took place with the city of Janesville, Rock County, St. Mary’s Hospital and residential, business and industrial interests to plan construction staging throughout the duration of this 2-1/2 year project.