I-39/90/94 Study

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

​​Project location

​I-39/90/94 from US 12/18 in Madison to the US 12/WIS 16 interchange in Wisconsin Dells

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

Project overview

  • The Wisconsin Department of Transportation (WisDOT) and the Federal Highway Administration (FHWA) are conducting the I-39/90/94 Corridor Study between US 12/18 in Madison and US 12/WIS 16 in Wisconsin Dells. The study will also evaluate​ I-39 from where it splits from I-90/94 to Levee Road near Portage. The study corridor is about 67 miles long and travels through Dane, Columbia, Sauk and Juneau counties.
  • The purpose of the I-39/90/94 Corridor Study is to address existing and future traffic demands, safety issues, aging and outdated infrastructure​, and corridor flooding.
  • 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.

Previous studies​

  • WisDOT recently completed I-90 Madison to Tomah Needs Study (January 2022). The study evaluated the existing and future conditions along I-90 corridor from US 12/18 in Madison to the I-90 I-94 split in Tomah (approximately 100 miles), including a portion of I-39 from I-90/94 to WIS 16. Evaluations included analysis of traffic, safety, pavement, and structures within the corridor. Existing year data was gathered in 2019. Future year analysis included forecasts for conditions through the year 2050. The purpose of the study was to provide information to make informed decisions for the I-39/90-/94 corridor regarding potential future safety, pavement, bridge, or other improvement projects. Further evaluation between Wisconsin Dells and Tomah may be part of a possible future corridor study.

​​​​For more information, please view the corridor needs assessment

Corridor needs assessment appendices​​​​

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