By Elyse Apel
The Center Square

Ten Native American tribal nations are urging the U.S. Supreme Court to send a legal challenge to the Great Lakes Tunnel Project back to the Michigan courts.

The tribes, which are all represented by environmental group Earthjustice, filed the amicus brief with the U.S. Supreme Court.

The brief argues that “underhanded procedural tactics” landed the case in America’s highest court.

“Enbridge missed a court deadline by more than two years, without excuse, and now they want to change the rules,” said Supreme Court Counsel Caroline Flynn at Earthjustice. “The Supreme Court should see through Enbridge’s transparent attempt at gamesmanship.”

This is just the latest chapter in an ongoing legal saga that has haunted the Great Lakes Tunnel Project for over half a decade.

The proposed changes would move a section of the pipeline into a tunnel under the Straits of Mackinac, which is the 4-mile wide waterway connecting Lake Michigan and Lake Huron, dividing Michigan’s Upper and Lower Peninsulas. The pipeline currently lies on the bottom of the Straits.

The transmission line is owned by Canadian company Enbridge and goes 645 miles from Superior, Wis., through the Straits of Mackinac in Michigan to Sarnia, Ontario. The 72-year-old pipeline currently moves more than 500,000 barrels of oil and natural gas liquids daily.

Enbridge argues that the upgrades will make Line 5 more reliable, while protecting the integrity of the gas supply chain to Michigan. It provided a statement to The Center Square in response to the tribes’ amicus brief.

“We are encouraged the U.S. Supreme Court has agreed to review the June 2024 decision of the U.S. Court of Appeals for the 6th Circuit remanding to state court the Michigan Attorney General’s lawsuit against Enbridge seeking to shut down Line 5,” the statement said.

The Michigan Attorney General brought this lawsuit in 2019 in an attempt to shut down the pipeline altogether, something state Democrats and the tribes are also pushing for.

“The continued operation of Line 5 puts my Tribal Nation in grave danger,” said Whitney Gravelle, President of the Bay Mills Indian Community. “Michigan made the right choice to end this pipeline, and we stand with the Attorney General to defend our rights, our waters, and the future of the Great Lakes for the next seven generations.”

A Michigan court initially ruled in favor of the state. Two years later, Enbridge decided to then attempt to move that case to federal court. While normally there is a 30-day time limit on that decision, the U.S. District Court for the Western District of Michigan ruled in 2022 that there were exceptional circumstances that allowed for an exception to that limit.

The Sixth Circuit Court of Appeals reversed that decision, in contradiction to two other federal decisions which did allow for exceptions to the 30-day time limit. That is what brought the case finally to the U.S. Supreme Court, which took it up in June.

“The District Court cited the important federal issues in this case, including U.S.-Canada Treaty issues, and the fact that litigation of these issues was already pending in another case in federal court,” Enbridge’s statement said. “The Supreme Court review will resolve this conflict in the courts of appeals.”

This is just one of the lawsuits currently filed against Enbridge and its Great Lakes Tunnel Project. For more information on other legal challenges, see previous reporting by The Center Square.

Republican lawmakers have joined together to support the project, which is slowly attempting to make its way out of regulatory and legal limbo. In June, the U.S. Army Corps of Engineers released a report which determined that the Line 5 tunnel project would have a “beneficial cumulative effect” on Michigan and its environment by reducing the risk of an oil leak.

While the report found there might be some “direct, short-term, detrimental impacts” during construction on the local environment and recreation, most “environmental consequences would be short-term with the effects resolving once construction is completed.”

The seven-year project, which has yet to break ground, is currently being expedited as a result of President Donald Trump’s day one executive order declaring a national energy emergency.