A proposal by Canadian oil giant Enbridge to construct a new four-mile pipeline beneath the Straits of Mackinac in Michigan has cleared another legal hurdle, with the state Court of Appeals upholding the legality of a 2018 state deal approving the project.
Enbridge claims the $500-million tunnel is needed to replace the existing underwater dual-pipe segment of Line 5, a nearly 70-year-old, 30-in. dia pipeline that transports up to 540,000 barrels per day of crude oil and natural gas liquids 645 miles between Superior, Wis., and Sarnia, Ontario.