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  4. Line 5 Michigan
  5. The Great Lakes Tunnel Project

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The Great Lakes Tunnel Project


On Dec. 19, 2018, Enbridge announced that it had reached an agreement with the Mackinac Straits Corridor Authority (MSCA) on the future of Enbridge's Line 5 light oil and natural gas liquids (NGL) pipeline at the Straits of Mackinac.

The Great Lakes Tunnel, a significant private investment by Enbridge in Michigan, will be built deep under the Straits to house Line 5. While Line 5 has operated safely and reliably in the Straits for more than 65 years, the Great Lakes Tunnel will be bored through rock, as much as 100 feet below the lakebed—virtually eliminating the chance of a pipeline incident in the Straits.

The Great Lakes Tunnel is a massive undertaking. It will be built by Michigan labor, and harness the knowledge and experience of industry-leading tunnel engineers, pending receipt of necessary permits and approvals.

The Great Lakes Tunnel Project


On Dec. 19, 2018, Enbridge announced that it had reached an agreement with the Mackinac Straits Corridor Authority (MSCA) on the future of Enbridge's Line 5 light oil and natural gas liquids (NGL) pipeline at the Straits of Mackinac.

The Great Lakes Tunnel, a significant private investment by Enbridge in Michigan, will be built deep under the Straits to house Line 5. While Line 5 has operated safely and reliably in the Straits for more than 65 years, the Great Lakes Tunnel will be bored through rock, as much as 100 feet below the lakebed—virtually eliminating the chance of a pipeline incident in the Straits.

The Great Lakes Tunnel is a massive undertaking. It will be built by Michigan labor, and harness the knowledge and experience of industry-leading tunnel engineers, pending receipt of necessary permits and approvals.

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Great Lakes Tunnel Project animation
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Interactive webpage: Bolstering safety at the Straits
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Find out how Enbridge safeguards the Great Lakes at our Line 5 Straits of Mackinac crossing, through a series of overlapping safety precautions.

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Support continues to grow for Great Lakes Tunnel
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Resolutions support tunnel construction under Straits of Mackinac

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Great Lakes Tunnel contractor ‘excited’ to get project moving
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Great Lakes Tunnel: 40,000+ hours dedicated to local environmental surveys
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Surveys play critical role in project’s permitting process
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Straits of Mackinac florists: ‘We couldn’t run without energy’
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Line 5 Newsroom
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Learn more about Enbridge's $500-million Great Lakes Tunnel Project and our Line 5 pipeline, which has been energizing Michigan since 1953.

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Above and beyond for round-the-clock Straits safety
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Great Lakes Tunnel: Geotechnical work
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‘Energy is crucial’ to microbrewery’s success
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Line 5 and the Great Lakes Tunnel: Fact vs. fiction
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An abundance of misinformation surrounds Enbridge’s Line 5 pipeline and our Great Lakes Tunnel Project. Learn the truth here.

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The regional impact
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The economies of Michigan, Ohio and elsewhere would face immediate and severe consequences if we did not have Line 5.

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Contact Enbridge in Michigan
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