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1 1 (November 9, 2021)

handle is hein.crs/goveeun0001 and id is 1 raw text is: Congressional
aResearch Service
Informing the Iegislative d bate since 1914___________________

Line 5 Pipeline: Replacement/Tunnel Project
November 9, 2021
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). Akey segment
of Line 5 is an underwater crossing at the Straits of Mackinac-between Michigan's upper and lower
peninsulas-where the pipeline 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 1. 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
continues operating the existing pipeline in the meantime. However, the state of Michigan has ordered
Line 5 to shut down. Whether the pipeline should continue operating in its current configuration, and
whether the federal government should grant a tunnel permit for a replacement crossing, have been the
subject of litigation, federal oversight, and a U.S. -Canada treaty dispute.
Congressional Research Service
https://crsreports.congress.gov
IN11798

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