Overview Video

Narrated overview video on the 45-mile expansion project – December 2012

Frequently Asked Questions (FAQ)

What is the I-39/90 Project?
It is the reconstruction and expansion of 45 miles of I-39/90 in Dane and Rock counties. The project will improve one of the most important transportation corridors in Wisconsin to continue as an integral part of the national Interstate system.

Can I still use I-39/90 on my way to Wisconsin Dells, northern Wisconsin, or Chicago?
I-39/90 will remain open to traffic for the duration of the project with some lane restrictions on a periodic basis, typically during off-peak travel hours.

When will the construction start and end?
The I-39/90 Expansion Project began in 2015 and is currently anticipated to be completed in 2023. Information on current construction events can be found under the Schedule section.

What are the project limits?
The project extends from the Illinois state line to the US 12/18 interchange near Madison, in Dane and Rock counties.

Will there be any property acquisition for this expansion project?
In many areas, the Wisconsin Department of Transportation (WisDOT) will need to acquire additional property to accommodate expansion. Not everyone will be affected. The project team will work with property owners during PIMs and throughout the acquisition process.

Are the traffic problems along I-39/90 that serious?
Yes. With no corrective action, all sections of I-39/90 are expected to operate at unacceptable levels of service, resulting in poor traffic flow and increased safety problems.

Is expansion to six lanes necessary?
Yes. An Environmental Assessment (EA) was conducted from 2001 to 2006 to examine the Interstate’s future needs and showed that the demands placed on the corridor in the coming years will stress the current roadway beyond its capabilities.

The project underwent a statutorily-set evaluation that considers a project’s potential to enhance economic development, relieve traffic congestion, improve safety and achieve community objectives while minimizing environmental impacts.

Why is I-39/90 in Janesville being expanded to eight lanes?
Due to projected traffic increases in the Janesville area (90,000 vehicles per day), the Interstate will be expanded to eight lanes for 6.5 miles from WIS 11 (Avalon Rd.) north to the WIS 26 interchange.

Where can I find up-to-date travel information?
View 511 Wisconsin website for up-to-date travel info.

Who do I contact for more information or with other questions?
For more info, contact the I-39/90 Project Team.