I-41 Project - Environmental Documents

Environmental Summary Documents

WisDOT avoids or minimizes the impacts of transportation projects to the natural and human environment while delivering projects efficiently. Balancing the department's environmental responsibilities with transportation program needs requires regulatory process expertise and a thorough understanding of state and federal environmental requirements. Environmental professionals in each transportation region and in the central office work to achieve this balance.

The below documents pertain to the I-41 Project and will be uploaded to this website as the project moves through the design phase. For an overview of WisDOT's Environmental Programs, please see the department Environmental webpage.

The following documents are in Adobe PDF format unless labeled otherwise.

(Note: Some files are large and may take longer to download depending on individual connection speeds. Users may need to zoom in to see details.)


FHWA and WisDOT have prepared an Environmental Assessment to document the impacts of the I-41 project. The Environmental Assessment was signed on June 17, 2021 and documents the purpose and need for the proposed​ improvements, alternatives considered, environmental impacts of the alternatives retained for detailed study, and public involvement and agency coordination during the project. Please note: The close of the agency and public comment period is August 6, 2021.