Enbridge awarded the contract for the construction of the Great Lakes Tunnel in the Straits of Mackinac,  to the joint venture Mackinac Straits Partners, composed of Barnard Construction Company Inc. from Bozeman in Montana (50%) and Civil and Building North America Inc. from Miami in Florida (50%) The tunnel will house the Line 5 pipeline as it crosses under the lakebed at the Straits to protect the Great Lakes and the environment and to ensure vital energy resources are delivered safely and reliably to the region. 

The contract was awarded following an extensive request for proposal (RFP) process that was initiated by Enbridge in early 2022. The Mackinac Straits Corridor Authority (MSCA), which is charged with oversight for construction and operations of the Great Lakes Tunnel agreed that the RFP conformed with requirements of the Tunnel Agreement. Financed solely by Enbridge, the Great Lakes Tunnel, once completed, will be owned and operated by the MSCA. 

Enbridge is preparing to begin construction as soon as possible following the receipt of environmental permits for the tunnel project from the U.S. Army Corps of Engineers. The Corps has indicated early 2026 for permit decision making. Visit https://www.enbridge.com/. 22/24.