The Mackinac Bridge is located on Interstate 75 in northern Michigan at the Straits of Mackinac. The bridge connects Michigan's upper and lower peninsulas. Mackinaw City is located at the south end of the bridge. St. Ignace is located at the north end of the Mackinac Bridge.
The Mackinac Bridge is currently the third longest suspension bridge in the world. The Mackinac Bridge is the longest suspension bridge in the western hemisphere. The total length of the Mackinac Bridge is 26,372 feet. The length of the suspension bridge (including anchorages) is 8,614 feet. The length from cable bent pier to cable bent pier is 7,400 feet. Length of main span (between towers) is 3,800 feet. The height of the roadway at mid-span is approximately 200 feet above water level. The bridge opened to traffic on November 1, 1957 according to schedule, despite the many hazards of marine construction over the turbulent Straits of Mackinac.
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