U-M Report Questions Federal Pipeline Safety Oversight Amid Line 5 Debate
New University of Michigan research challenges federal pipeline safety oversight as the controversial Line 5 faces ongoing legal battles in the Straits of Mackinac.
DETROIT, MICHIGAN — A new University of Michigan report questions the effectiveness of federal pipeline safety oversight, raising concerns about the Line 5 pipeline as Enbridge continues legal battles with state officials over the aging infrastructure in the Straits of Mackinac.
The report suggests that national-level oversight by federal regulators is insufficient to prevent oil spills and other safety incidents, according to the Michigan Advance. This comes as Enbridge, the Canadian pipeline company operating Line 5, maintains that federal regulators hold exclusive authority over interstate pipeline safety regulations.
Line 5 Legal Battle Continues
Enbridge currently operates the Line 5 pipeline through a four-mile segment in the Straits of Mackinac, where Lake Michigan and Lake Huron meet. The company faces ongoing legal challenges from Michigan state officials who seek to shut down this portion of the more than 70-year-old pipeline.
In 2020, Governor Gretchen Whitmer revoked the pipeline’s easement to operate on Great Lakes bottomlands, citing environmental concerns and the state’s responsibility to preserve natural resources under public trust doctrine. However, Enbridge successfully argued in federal court that federal law prevents states from placing safety regulations on interstate pipelines, with the Pipeline and Hazardous Materials Safety Administration holding exclusive authority over pipeline safety regulations.
Safety Concerns Mount
Pipeline opponents have characterized Line 5 as a “ticking time bomb,” pointing to previous incidents including a spill from Enbridge’s Line 6B and multiple anchor strikes that have dented the dual pipelines and damaged structural supports.
The aging infrastructure has sustained visible damage over the years, including documented harm to anchor supports on the pipeline’s east leg. These incidents have intensified calls for the pipeline’s closure among environmental advocates and state officials.
Company Seeks Infrastructure Replacement
Despite safety concerns, Enbridge maintains that Line 5 operates safely and continues pushing forward with plans to replace the existing infrastructure. The company seeks to construct a new pipeline segment housed inside a maintenance tunnel beneath the lakebed, which would replace the two current segments operating in the Straits of Mackinac.
The University of Michigan report adds academic weight to ongoing debates about pipeline oversight effectiveness. As federal and state authorities continue their jurisdictional dispute, the report’s findings suggest that current regulatory frameworks may be inadequate to address the risks posed by aging pipeline infrastructure in environmentally sensitive areas like the Great Lakes region.
The Line 5 controversy represents a broader conflict between energy infrastructure needs and environmental protection, with implications extending beyond Michigan’s borders as the pipeline carries oil and natural gas liquids from western Canada to refineries in the Midwest and eastern Canada.
