Enbridge Line 5

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Enbridge Line 5 is a 645-mile oil pipeline owned by the Canadian multinational corporation Enbridge. Constructed in 1953, the pipeline conveys crude oil from western Canada to eastern Canada via the Great Lakes states. Line 5 is part of the Enbridge Lakehead System and passes under the environmentally-sensitive Straits of Mackinac, which connect Lake Michigan to Lake Huron. The 30-inch pipeline carries 540,000 barrels (86,000 m3) of synthetic crude, natural gas liquids, sweet crude, and light sour crude per day as of 2013. From 1967 to 2017, Line 5 spilled over 1.1 million gallons of oil. In December 2018, the Michigan Department of Natural Resources announced that the Mackinac Straits Corridor Authority (MSCA), with outgoing Governor Rick Snyder approving Enbridge's plan to replace the underwater segment of Line 5 with a new pipeline segment housed in a tunnel.