I-39/90 Expansion Project

Illinois state line to Madison, Dane and Rock Counties


Welcome to the official WisDOT website for the I-39/90 Expansion Project in south-central Wisconsin.

Stay informed and involved with the project:

  • Sign up for email updates under the "Sign Up for Updates" tab.
  • Learn about upcoming construction work under Schedule.

Thank you for your patience as we "improve a gateway to Wisconsin!"