I-39/90 Expansion Project

Illinois state line to Madison, Dane and Rock counties

South Segment

Beloit to Janesville

???????????????????????????????This segment extends approximately 12 miles along I-39/90 from the Illinois state line north to County O, south of Janesville. The Interstate was reconstructed and expanded to six lanes from the Illinois state line north to WIS 11 (Avalon Rd.). Eight lanes (four lanes in each direction) will continue from WIS 11 (Avalon Rd.) north to County O, south of Janesville.

Interchanges to be reconstructed include:

  • I-43/WIS 81 – completed in 2021
  • County S (Shopiere Rd.) – completed in 2015
  • WIS 11 (Avalon Rd.) – completed in 2016

The reconstruction addressed roadway deficiencies. Grade separated crossings along the segment were also included in the reconstruction.

The I-39/90 Expansion Project began in 2015 and the mainline project was completed by late November 2021.