An important deadline comes up Friday for those who have any kind of opinion on Enbridge Inc.’s proposal to construct a tunnel under the Straits of Mackinac for its Line 5 pipeline.

The 645-mile pipeline transports up to 540,000 barrels per day of light crude oil, light synthetic crude and natural gas liquids that are refined into propane, according to Canada-based Enbridge.

It extends from Superior, Wis., to Sarnia, Ontario, crossing along the way through Gogebic, Iron, Dickinson, southern Marquette, Delta, Schoolcraft and Mackinac counties in the Upper Peninsula.

But it’s where Line 5 transitions from Upper to Lower Michigan that has drawn the most scrutiny — the 4.5-mile dual section that runs underwater along the bed of the straits, where Lake Michigan and Lake Huron meet.

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