The five-mile Mackinac Bridge, connecting upper and lower Michigan, is the world's longest suspension bridge between cable anchorages. Designed by engineer David B. Steinman, P.E., the founder of the National Society of Professional Engineers, the impressive and graceful bridge got its official construction start on May 7 and 8, 1954, at St. Ignace and Mackinaw City. Work had to brave the turbulent Straits of Mackinac currents, but the bridge opened to traffic on schedule on November 1, 1957. The Mackinac Bridge represents one of master bridge builder Steinman's major achievements and stands out as an engineering marvel to this day.
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Activity Type:Trips and Destinations
Grade:K-2, 3-5, 6-8, 9-12
Fun Fact:The main cables on the bridge contain 42,000 miles of wire, with 12,580 wires in each cable. It took 4000 engineering drawings and 85,000 blueprints to build this 1,024,500 ton structure.