November 17, 2025
[ DOWNLOAD: Flow Water Advocates Brief on Appeal (PDF) ]
Traverse City, Mich. — Flow Water Advocates (“Flow”) has filed a brief in its appeal of the Michigan Public Service Commission’s decision to approve a permit for Enbridge’s proposed Line 5 pipeline tunnel under the Straits of Mackinac. Flow’s appeal will be heard in the Michigan Supreme Court.
In September, the Court granted a landmark application for leave to appeal, paving the way for a review of the permit. Flow initiated the legal challenge, arguing that the MPSC failed to uphold its public trust obligations to protect Michigan’s waters and submerged lands. The Supreme Court’s order specifically directs the parties to address whether the MPSC is required to comply with the common law public trust doctrine in its permitting decisions.
Support Flow’s work to defend the Great Lakes.
In its brief filed on November 14, Flow addresses three central questions regarding the common-law public trust doctrine and the Michigan Environmental Protection Act (“MEPA”) and their application by the MPSC.
First, Flow argues that the plain meaning of the statutory text and the legislative history of MEPA binds all agencies to protect the air, water, and other natural resources and the public trust in these resources.
Second, Flow maintains that all agencies, including the MPSC, as arms of the state have an independent duty to comply with the State’s public trust obligations. As the sovereign title holder, the State may not violate the public trust by granting rights to use the Great Lakes bottomlands without regard to the trust’s restrictions. Thus, the effect of the common-law public trust doctrine is to safeguard the public’s interests in the waters and submerged lands of the Great Lakes. When the MPSC granted the tunnel permit without conducting a public trust analysis, it failed to fulfill its duty to assess potential impacts to the public’s paramount rights in the resources at stake.
Third, Flow argues that the MPSC cannot permit Enbridge’s tunnel project unless and until the Department of Environment, Great Lakes and Energy (“EGLE”) makes the requisite public-trust determinations under the common-law public trust doctrine and the Great Lakes Submerged Lands Act. In its brief, Flow articulates what a proper public trust analysis must look like to ensure that the proposed action — in this case, the siting and construction of an underground tunnel and pipeline through the bottomlands of the Straits — does not violate the State’s obligation to protect these public trust resources. EGLE cannot approve any proposed use of Great Lakes bottomlands, unless it has determined both that the adverse effects to the environment and the public trust will be minimal, and that there is no feasible and prudent alternative to the applicant’s proposed activity — such as the shutdown of Line 5. These mandatory determinations have not been made; therefore, the MPSC is required to deny Enbridge’s permit application under Michigan law.
Flow is represented in this case by its legal team and co-counsel, Kanji & Katzen, P.L.L.C. and Olson & Howard, P.C. The case will be heard alongside a related appeal from a coalition of the Little Traverse Bay Band of Odawa Indians, Bay Mills Indian Community, Grand Traverse Band of Ottawa and Chippewa Indians, and Nottawaseppi Huron Band of the Potawatomi, with the Environmental Law and Policy Center and the Michigan Climate Action Network.
###
Flow Water Advocates is an independent 501(c)(3) nonprofit organization based in Traverse City, Michigan. Our mission is to ensure the waters of the Great Lakes Basin are healthy, public, and protected for all. With a staff of legal and policy experts, strategic communicators, and community builders, Flow is a trusted resource for Great Lakes advocates. We help communities, businesses, agencies, and governments make informed policy decisions and protect public trust rights to water. Learn more at www.FlowWaterAdvocates.org.


