Full Breakdown
U.S. Army Corps Issues Federal Permit for Enbridge Line 5 Tunnel Project
8/14/2026, 1:09:34 AM
Core Event: Federal Permit Granted
The U.S. Army Corps of Engineers (USACE) issued a permit allowing Enbridge Energy to construct a 3.6-mile tunnel beneath the Straits of Mackinac for a new segment of the Line 5 oil and natural-gas liquids pipeline. The permit covers work in federally regulated waters but does not extend to pipeline operation or the substances it carries.
Background & Context
Line 5, a 645-mile pipeline owned by Canada-based Enbridge, has crossed the Straits for more than seven decades. An anchor strike in 2018 raised safety concerns. Michigan regulators approved two state permits for the tunnel in August 2026, but the state Supreme Court later overturned them, citing insufficient consideration of Great Lakes impacts. The federal permit removes the last major federal hurdle, though lawsuits—including one by Michigan Attorney General Dana Nessel—remain pending.
Data & Statistics
- Tunnel length: ? 3.6 mi (? 5.8 km)
- Existing Straits segment: ? 3.7 mi, 30-inch pipe splitting into two 20-inch pipes, up to ? 240 ft deep
- Review period: more than six years of USACE environmental analysis
- Threatened species: Houghton’s goldenrod and dwarf lake iris (Endangered Species Act)
Official Statements & Responses
Assistant Secretary of the Army for Civil Works Adam Telle said the approval shows “fast, clear, and consistent decisions” that give regulatory certainty. The Michigan Supreme Court’s 6-1 ruling ordered a reevaluation of the state approval, noting the original review omitted public-trust resource impacts.
Criticism & Opposition
A coalition of Native American tribes, represented by Managing Attorney David Gover of the Native American Rights Fund, called the permit “rubber-stamped” and a violation of treaty obligations. Environmental group Oil & Water Don’t Mix described the action as driven by a “phony ‘national energy emergency’.” Earth Justice argued the accelerated review “short-circuited” environmental assessment, prompting several tribes to withdraw as cooperating agencies in 2025.
Conflicting Reports & Gaps
- The Corps acknowledges “major, permanent, adverse effects” on archaeological resources but says mitigation will prevent significant species loss.
- State permits note disruption to burial sites and wetlands; the federal permit does not address the pipeline’s ongoing operation, leaving long-term spill risk unanswered.
- Pending litigation includes a state lawsuit alleging violations of the public-trust doctrine and the Michigan Environmental Protection Act, while Enbridge asserts federal pre-emption under the Pipeline Safety Act.
Verbatim Quotes
- “The approval of the Enbridge Line 5 Tunnel Project is a testament to President Trump’s vision to ensure our nation’s energy dominance,” — Assistant Secretary
- “ "They disregarded our treaty rights, ignored the information we provided through consultation, and pushed past cultural resource obligations under the manufactured excuse of an ‘energy emergency,'" Gravelle said.” — Whitney Gravelle, Indian community president
Timeline
- July 15 – Michigan agencies issued two permits, noting impacts to burial sites and wetlands.
- August 2026 (Wednesday) – USACE issued the federal permit, completing the primary federal review.
- Subsequent weeks – Michigan Supreme Court’s 6-1 decision overturns the state approvals, mandating a new environmental review.
- Ongoing – Multiple lawsuits continue in state and federal courts; the Corps’ permit does not resolve authority over pipeline operation.
