I-39/90/94 (County CS - Portage Interchange)

Project location | Project overview | Schedule | Traffic impacts/detours | Status/phase | Contact information

Project location

I-39/90/94 (County CS - Portage Interchange), Madison - Portage, Columbia County

Project overview

The seven mile project is located on I-39/90/94 between the I-39/90/94 and I-39 split (Portage interchange) and the County CS interchange in Columbia County.

From the County CS interchange to the Wisconsin River Bridge roadway improvements include an asphalt overlay on the existing driving surface and shoulders, installation of new guard rails, grading of the side slopes, and new permanent signing and markings. 

At the Portage interchange the existing concrete pavement will be repaired.


  • April 2018 – October 2018 - Construction anticipated

Traffic impacts/detours

I-39/90/94 will be open to traffic during construction with off-peak lane closures.  All lanes and shoulders will be open for weekend and holiday traffic.  Ramp closures at the Portage interchange will be required and detours will be posted.



Contact information

Matthew Dapp, WisDOT Project Manager
(608) 246-5353

Michael Bie, WisDOT Southwest Region Communications Manager
(608) 246-7928

Wisconsin Department of Transportation (WisDOT)
Southwest Region, Madison Office
2101 Wright Street
Madison, WI 53704
Phone: (608) 246-3800
Fax: (608) 246-3843
TTY: 711
Email: swr.dtsd@dot.wi.gov