I-39/90 Expansion Project

Illinois state line to Madison, Dane and Rock counties

Project Segments

Due to the size and magnitude of the 45-mile corridor of I-39/90, the project is separated into three segments (north, central and south) for design purposes. This multi-team approach keeps the project more manageable and allows the individual teams to focus on specific areas and concerns.

Click on the maps below to view project information specific to that segment.

North segment: Dane/Rock County line to US 12/18 interchange near Madison


Central segment: County O, south of Janesville, to Dane/Rock County line


South segment: Illinois state line to County O, south of Janesville