What is the Enbridge Line 5 tunnel?


Enbridge is proposing to bore and blast a 20-foot-in-diameter oil tunnel under the Straits of Mackinac to house a new Line 5 pipeline. 

The Canadian company’s goal is to continue for another 99 years carrying up to 23 million gallons of oil and natural gas liquids a day through Line 5 and the public trust bottomlands where Lake Michigan meets Lake Huron.

FLOW and our partners have identified critical deficiencies in the project’s construction permit application, its legal authorization, and the review by state environmental agencies of expected impacts to wetlands, bottomlands, and surface water, including from the daily discharge of millions of gallons of wastewater during construction. FLOW has deep concerns about the lack of public necessity for the project, which would worsen climate change and related impacts to the Great Lakes.

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