Skip to main content

Line 5 in Michigan

Aerial view of the Straits of Mackinac
Environment, Great Lakes, and Energy

Line 5 in Michigan

Line 5 Tunnel Project Proposal Enbridge Energy Limited Partnership is currently seeking approval to build a tunnel and to replace and relocate the portion of the Line 5 pipeline that runs beneath the Straits of Mackinac. The proposed tunnel would house the replacement segment for the Line 5 petroleum pipeline that sits on the bottom of the Straits.

Review and permitting decisions for the proposed project involve multiple state agencies and the U.S. Army Corps of Engineers. This webpage is intended to provide an overview of the routine regulatory permitting process that the proposed project will require.

Comment

Overview

Timelines

Permits

Documents

Involved agencies

Multiple government agencies are involved with Enbridge's Line 5 project. At this time, EGLE has approved some permit applications regarding Line 5, but other agencies are involved in other permit applications in various stages of the permitting process. Visit each agency's website to learn more about their jurisdiction and role in the Line 5 Tunnel Project.

  • Michigan Public Service Commission

    Michigan Public Service Commission

    In December, 2023, the MPSC approved Enbridge’s application to replace and relocate the segment of Line 5 crossing the Straits of Mackinac into a tunnel beneath the Straits

  • Michigan Department of Environment, Great Lakes and Energy (EGLE)

    Dept. of Environment, Great Lakes, & Energy

    EGLE evaluates pipeline projects that impact water resources; Enbridge has submitted permit applications for work within wetland areas, water discharges and submerged lands

  • MDOT logo

    Mackinac Straits Corridor Authority

    MSCA is responsible for overseeing construction and operation of a tunnel in bedrock beneath the waters of the Straits of Mackinac and will own the tunnel after its construction

  • US Army Corps of Engineers Castle Logo

    US Army Corps of Engineers

    USACE is conducting an independent review of the proposed Line 5 pipeline tunnel project which will inform its permit decision on Enbridge’s application with them