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Line 5 Pipeline: Replacement/Tunnel Project



Updated December 6, 2023


The Line 5 Pipeline is a 30-inch, 645-mile pipeline owned by Enbridge carrying up to 540,000 barrels per
day of crude oil and natural gas liquids from Superior, WI, to Sarnia, Ontario (Figure 1). A key segment
of Line 5 is an underwater crossing at the Straits of Mackinac-between Michigan's upper and lower
peninsulas-where it runs for approximately four miles across the lakebed. This crossing has been an
environmental concern due to the risk it poses of a worst case oil spill into the Great Lakes.


Figure I. Enbridge Line 5 Pipeline


                      Source: CRS using data from Platts, and Esri Data & Maps 2019.
Under the terms of various state agreements, Enbridge plans to replace this pipeline segment with a new
one constructed through a tunnel beneath the lakebed-which requires federal approval. Enbridge plans to
continue operating the existing pipeline in the meantime. However, for different reasons, the State of
Michigan and a federal court have ordered Line 5 to shut down. Whether the pipeline should continue
operating is the subject of litigation, federal oversight, and a U.S.-Canada treaty dispute.




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