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The Mackinac Bridge will be closed on Labor Day from 6:00am to noon for the Annual Labor Day Bridge Walk. Unites Michigan's upper and lower peninsulas. The Mackinac Bridge is the longest suspension bridge in the Western Hemisphere with 7,400 feet of roadway suspended in the air over the straits of Mackinac. Total length of the bridge, including its approaches, is approximately five miles. Celebrate 50 years with the mighty Mac with the Michigan History Magazine. Click on the link for more information.