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Line 5 Tunnel Project Proposal Enbridge Energy Limited Partnership is currently seeking approval to build a utility 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.
Find past and upcoming opportunities for public comment on the proposed Line 5 pipeline and tunnel.
Environmental Assistance Center at EGLE-Assist@Michigan.gov or 800-662-9278.
Line 5 currently crosses the straits from Point LaBarbe in the Upper Peninsula to McGulpin Point in the Lower Peninsula – the shortest distance between the two peninsulas. The proposed tunnel would follow the same route below the existing west pipeline. (Figure 1)
Location chosen by Enbridge adjacent to the existing North Straits Facility as the preferred location for the north side tunnel entrance. (Figure 2A)
Location chosen by Enbridge adjacent to the existing Mackinac Station as the preferred location for the south side tunnel entrance. (Figure 2B)
Depicts the approximate location of the tunnel as shown in the Enbridge application. (Figure 3)
Detailed view of the North shore depicting the existing dual pipelines, proposed replacement segment, proposed workspace, and easement boundaries.
