Project Resources

Environmental Study

WisDOT completed an environmental assessment in June 2021 for the I-41 Project that found – in concurrence with public comments received – that reconstructing the corridor would not result in significant impacts on the quality of the environment.

WisDOT partners with state and federal agencies and non-government organizations to accomplish the transportation mission and meet environmental responsibilities.

Transportation projects are subject to a variety of regulations including but not limited to the National Environmental Policy Act and the Wisconsin Environmental Policy Act.

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The I-41 Project Environmental Assessment documented the following elements related to the project:

The purpose and need for the proposed roadway improvements
The alternatives WisDOT considered
The environmental impacts of the alternatives retained for detailed study
Public involvement and agency coordination efforts

WisDOT approved the environmental assessment, giving agencies and the public the opportunity to review the document and provide comments, including at the public hearings held in July 2021.

The Federal Highway Administration then issued a Finding of No Significant Impact or FONSI documenting the decision, concluding the environmental study process, and allowing the project to proceed to the design phase.

Environmental Study Re-Evaluation Documents

I-41 Project Environmental Assessment Re-Evaluation Template

I-41 Project Environmental Assessment Re-Evaluation Figures

I-41 Project Environmental Assessment Re-Evaluation Factors

I-41 Project Environmental Assessment Re-Evaluation Appendix A

I-41 Project Environmental Assessment Re-Evaluation Appendix B

I-41 Project Environmental Assessment Re-Evaluation Appendix C

I-41 Project Environmental Assessment Re-Evaluation Appendix D

I-41 Project Environmental Assessment Re-Evaluation Appendix E-H

I-41 Project Environmental Assessment Re-Evaluation Appendix I

I-41 Project Environmental Assessment Re-Evaluation Appendix J Part 1 of 2

I-41 Project Environmental Assessment Re-Evaluation Appendix J Part 2 of 2

I-41 Project Environmental Assessment Re-Evaluation Appendix K

I-41 Project Environmental Assessment Re-Evaluation Appendix L

I-41 Project Environmental Assessment Re-Evaluation Approved De Minimis

I-41 Project Environmental Assessment Re-Evaluation Signature Pages

Environmental Study Original Documents

I-41 Project Environmental Assessment Cover Page and Availability Template

I-41 Project Environmental Assessment Preferred Alternatives Maps (1 of 2)

I-41 Project Environmental Assessment Preferred Alternatives Maps (2 of 2)

I-41 Project Environmental Assessment Factor Sheets

I-41 Project Environmental Assessment Appendix A

I-41 Project Environmental Assessment Appendix B

I-41 Project Environmental Assessment Appendix C

I-41 Project Environmental Assessment Appendix D

I-41 Project Environmental Assessment Appendix E

I-41 Project Environmental Assessment Appendix F

I-41 Project Environmental Assessment Appendix G

I-41 Project Environmental Assessment Appendix H

I-41 Project Environmental Assessment FONSI – Document Availability and Hearing Summary

I-41 Project Environmental Assessment FONSI – Document and Figures

I-41 Project Environmental Assessment FONSI – Appendices

I-41 Project Environmental Assessment FONSI – Factor Sheets

I-41 Project Environmental Assessment FONSI – Preferred Alternatives Maps 1 of 2

I-41 Project Environmental Assessment FONSI – Preferred Alternatives Maps 2 of 2

I-41 Project Environmental Assessment FONSI – Non-Preferred Alternatives Maps

How-To Videos:

Explore the Interchanges

Tap or click the video to expand and view full screen.

Auxiliary Lane

An auxiliary lane is an extra lane between ramps that makes it easier to merge or exit without slowing down highway traffic.

Collector-Distributor (C‑D) Road

A collector-distributor (C-D) road runs parallel to the main travel lanes of a highway to handle merging and exiting traffic, keeping the main lanes moving smoothly.

Diamond Interchange

A diamond interchange uses two signalized intersections where ramps meet a side street, providing a simple and efficient way to enter or exit the highway.

Diamond Interchange with Roundabouts

A diamond interchange with roundabouts shifts traffic briefly to the left side of the road to allow for more efficient left-turn movements. Roundabouts help avoid backups onto the freeway in areas with high traffic flow.

Diverging Diamond Interchange (DDI)

A diverging diamond interchange briefly shifts traffic to the left side of the road so drivers can make left turns without crossing oncoming traffic, improving safety and traffic flow.

Roundabout

A modern roundabout is a circular intersection where drivers travel counterclockwise, yield to traffic already in the roundabout, then enter the circular roadway and exit at the desired street.

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Current Job Postings

Wisc.Jobs

Geotechnical engineers extract soil samples that are analyzed and then factored when WisDOT designs the roadways, bridges and other structures.

Real Estate

The Wisconsin Department of Transportation, Bureau of Technical Services-Real Estate (WisDOT/BTS-RE) works to acquire the property needed for highway construction and highway related facilities. If you have specific questions about your property, please contact the I-41 Project real estate team at 41realestate@dot.wi.gov.

For additional information regarding your rights as a landowner, see the brochure(s) linked.

Real Estate Brochure - English Real Estate Brochure - Spanish Real Estate Brochure - Hmong

I-41 Project Resources

Environmental
Study

How-to Videos

Career Opportunities

Real Estate

Environmental Study