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Michigan Law and Agreements Enabling Utility Tunnel and Oversight

Michigan's Governor Snyder entered into agreements with Enbridge and passed a law allowing the construction of a utility tunnel through the Straits of Mackinac. 

The law and agreements are included here.

Act No. 359 (HTML version) - 12/12/2018

Law Authorizing Creation of Mackinac Straits Corridor Authority and Tunnel Oversight

The Tunnel Agreement- 12/19/2018

Third Agreement - 12/19/2018

Agreement to fulfill the parties' obligations under the Second Agreement
  • Continued Operation of Dual Pipelines Pending Completion of Tunnel and Activation of Line 5 Replacement Segment
  • Compliance with 1953 Easement
    • Financial Assurance
    • Pipeline Coatings
    • Maximum Span of Unsupported Pipe
  • Construction and Operation of Straits Line 5 Replacement Segment
  • Permanent Deactivation of Dual Pipelines
  • Delay Events
  • Dispute Resolution
  • Termination


Second Agreement - 10/3/2018

Agreement to pursue a further agreement to address Line 5’s crossing of the Straits of Mackinac
  • Continued Coordination Between the State and Enbridge
  • Replacement of Line 5 St. Clair River Crossing
  • Discontinuation of Line 5 Operations in the Straits During Sustained Adverse Weather Conditions
  • Underwater Technologies to Enhance Leak Detection and Technologies to Assess Coating Condition of the Dual Pipelines
  • Implementation of Measures to Mitigate Potential Vessel Anchor Strike
  • Replacement of Dual Pipelines in a Straits Tunnel
  • Further Agreements for a Straits Tunnel
  • Permanent Deactivation of the Dual Pipelines
  • Line 5 Water Crossings Other Than the Straits
  • Financial Assurance
  • Continuation of Additional Measures to Enhance the Safety of Line 5 in Michigan


First Agreement - 11/27/2017

Agreement to improve coordination between Enbridge and the State of Michigan for operation and maintenance of Line 5 pipeline
  • Increases coordination between Enbridge and the State of Michigan
  • Replacement of Line 5 St. Clair River Crossing
  • Discontinuation of Line 5 Operations in the Straits during sustained adverse weather conditions
  • Evaluation of underwater technologies to enhance leak detection
  • Evaluation and implementation of measures to mitigate potential vessel anchor strike
  • Evaluation of alternatives to replace dual pipelines
  • Evaluation of Line 5 water crossings other than the Straits
  • Potential further agreement concerning pipelines across the Straits


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  • Bill Latka
    published this page in Reports & Info 2022-02-07 11:58:03 -0500

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