I-39/90/94 Study

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

​Project location

I-39/90/94 from US 12/18 (Beltline) in Madison to just north of the US 12/WIS 16 interchange in Wisconsin Dells

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

Project overview

  • The Federal Highway Administration (FHWA) and WisDOT are evaluating potential improvements to the I-39/90/94 corridor in Dane, Columbia, Sauk and Juneau counties from US 12/18 (Beltline) in Madison to just north of the US 12/WIS 16 interchange in Wisconsin Dells. The study will also evaluate I-39 from the I-39 and I-90/94 split near Portage (locally known as the Petro Interchange) to Levee Road.
  • ​The study will assess how best to address existing and future traffic demands, safety issues and the aging and outdated infrastructure along this portion of I-39/90/94.
  • WisDOT will identify project needs and evaluate ​a range of ​​​alternatives in an environmental impact statement (EIS). The EIS process, which will include ongoing opportunities for public involvement, will lead to the identification of a preferred alternative.
  • Project overview

*Please note, off alignment options are not being considered for this study


  • 2022 (May-December)
    • ​Data collection
    • Develop project purpose and need
    • ​​Public involvement activities begin
  • 2023
    • Develop alternatives
    • Begin environmental impact analysis
    • Ongoing public involvement activities
  • 2024​
    • ​Finalize environmental impact analysis
    • Public hearing
    • Complete environmental document
    • Ongoing public involvement activities

For more information about public involvement opportunities and other activities, visit the I-39/90/94 Corridor Study – Public involvement page.​


  • ​Environmental study with no construction activities planned at this time.
  • Public involvement activities are expected to begin in late 2022.
  • ​Currently gathering data to identify corridor alternatives and potential impacts on human​-made and natural resources.

Contact information

Frank Pritzlaff, P.E., Project Manager
(262) 548-5683

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