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.)


  • Currently in development


WisDOT, in cooperation with Federal Highway Administration (FHWA), will complete an Environmental Assessment for the I-41 Project. The Environmental Assessment is developed under the National Environmental Policy Act. This document will include:

  • Purpose and need for the project
  • Range of alternatives considered
  • Environmental consequences and potential mitigation measures
  • Identification of a preferred alternative
  • Public and Agency coordination