Article

Enbridge's Line 5 pipeline, a 645-mile conduit transporting crude oil and natural gas liquids from Superior, WI, to Sarnia, Ontario, is under scrutiny due to environmental concerns, especially regarding its underwater segment at the Straits of Mackinac and its crossing over the Bad River Reservation in Wisconsin. Enbridge plans to construct a new segment through a tunnel beneath the Straits and reroute the Wisconsin segment, but both projects require federal approval.

Legal disputes include Michigan's efforts to shut down the pipeline, citing public nuisance and pollution risks, while Enbridge contests the revocation of its 1953 easement. The U.S. Supreme Court is involved following a federal appeals court ruling allowing Enbridge to sue Michigan.

Various agencies, including the Michigan Department of Environment and the U.S. Army Corps of Engineers, are reviewing permits for the tunnel project. The Canadian government supports Line 5, invoking a 1977 treaty that prohibits measures obstructing hydrocarbon transmission.