I-39/90/94 Study

Project location | Project overview | Schedule | Status/phase | Contact information

Update: Announcement regarding cancellation of I-39/90/94 study.

Refined Corridor Alternatives Maps available:

​Information from Public Involvement Meetings held November 15 and November 16, 2016 is available. View presentation and exhibits for details.

Project location

I-39/90/94, from US 12/18 to I-39/WIS 78, from Madison to Portage, in Dane and Columbia counties.

The corridor also includes:

  • WIS 30 from East Washington Avenue in Madison to I-39/90/94
  • I-94 from I-39/90 to County N in Cottage Grove
  • US 151 from I-39/90/94 to Main Street in Sun Prairie
  • I-39/90/94, US 51, and WIS 19 triangle in DeForest
  • Project location

View I-39/90/94 Study in a larger map.

Project overview

  • WisDOT is conducting a study to analyze the existing and future conditions of the I-39/90/94 corridor.
  • Possible improvements and their impacts will be studied over the next several years.
  • This study involves the completion of a Tier 1 Environmental Impact Statement (EIS).
  • A range of corridor alternatives will be evaluated during the EIS process, which will ultimately lead to the identification of a preferred corridor alternative.
  • The portion of the corridor from County CS to I-39/WIS 78 will undergo more detailed analysis in the EIS. The detailed analysis will allow for final design to begin on this portion of the corridor at the completion of the Tier 1 EIS.
  • This is a higher priority within the overall corridor becuase the Wisconsin River bridges are nearing the end of their economically viable life span.


For more information on Public Involvement Meetings (PIM), hearings and other public activities, visit Public involvement.


  • 2021-2022 - Complete first Tier 2 National Environmental Policy Act (NEPA) Document


  • 2014
    • Traffic Impact Analysis (TIA) of I-39/90/94 corridor near Madison completed
    • December 2014 - Newsletter
    • December 18, 2014 - Held joint TAC/PAC meeting
    • Created Technical Advisory Committee (TAC)
    • Created Policy Advisory Committee (PAC)
    • August 2014 - Study was initiated


Long term National Environmental Policy Act (NEPA) study with no construction activities planned at this time.

Currently gathering data, to identify potential impacts to both man-made and natural resources and develop cost estimates, for all of the corridor alternatives.

Contact information

Robert Knorr, P.E., Project Manager
(608) 246-5444

Larry Barta, P.E., Deputy Project manager
(608) 246-3884

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