Michigan Court Protects Great Lakes in Pipeline Ruling

In a decision that could reshape how Michigan protects its natural resources, the state's highest court just told regulators they need to look at the bigger picture before approving a major pipeline project under the Great Lakes.

The Michigan Supreme Court ruled 6-1 last week that state officials didn't do their homework before greenlighting a tunnel for Enbridge Energy's Line 5 pipeline. The 73-year-old pipeline carries oil and natural gas beneath the Straits of Mackinac, where lakes Michigan and Huron meet.

Four tribal nations and three environmental groups challenged the permit, arguing that regulators looked too narrowly at the project. They said officials only examined the tunnel itself, ignoring how it might extend the aging pipeline's life and increase risks of spills and emissions.

Justice Elizabeth Welch agreed. In a 58-page opinion, she wrote that the Michigan Public Service Commission must consider whether the tunnel project extends the pipeline's lifespan and what that means for the environment and public access to natural resources.

The court also affirmed something powerful: Michigan's public trust doctrine requires state agencies to protect citizens' right to use natural resources like the Great Lakes. Previous regulators had questioned whether they even had to consider this legal principle.

"The door has been kicked open to an imaginable future where we can talk about alternatives other than Line 5," said President Whitney Gravelle of the Bay Mills Indian Community, one of the groups that brought the case.

The Bright Side

This ruling does more than send one permit back for review. It sets a precedent for how Michigan evaluates environmental projects going forward.

Chad Hughes, senior attorney for the Environmental Law & Policy Center, explained that the court made clear environmental reviews must be practical and broad. Regulators can't just focus on a project's physical footprint anymore. They have to examine where environmental harms actually happen.

The decision comes as Line 5 faces other legal challenges, including from Governor Gretchen Whitmer's administration. This spring, the U.S. Supreme Court cleared the way for state courts to decide whether the aging pipeline can keep operating in the straits at all.

For communities who've spent years worried about oil spills threatening the world's largest freshwater system, the ruling offers something they've been fighting for: a thorough examination of what's at stake.

Michigan just proved that protecting natural treasures and considering long-term consequences isn't just good policy—it's required by law.