Mackinac Bridge

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The Mackinac Bridge (pronounced /ˈmækɨnɔː/, MAK-in-aw), is a suspension bridge spanning the Straits of Mackinac to connect the non-contiguous Upper and Lower peninsulas of the U.S. state of Michigan. Envisioned since the 1880s, the bridge was completed in 1957 only after many decades of struggles to begin construction. Designed by engineer David B. Steinman, the bridge (familiarly known as "Big Mac" and "Mighty Mac") connects the city of St. Ignace on the north end with the village of Mackinaw City on the south. It is the third longest in total suspension in the world[3] and the longest suspension bridge between anchorages in the Western hemisphere.[4] The Mackinac Bridge carries Interstate 75 across the straits.

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Length

The bridge opened on November 1, 1957, ending decades of the two peninsulas being solely linked by ferries. A year later, the bridge was formally dedicated as the "world's longest suspension bridge between anchorages." This designation was chosen because the bridge would not be the world's largest using another way of measuring suspension bridges, the length of the center span between the towers; at the time that title belonged to the Golden Gate Bridge, which has a longer center span. By saying "between anchorages", the bridge could be considered longer than the Golden Gate Bridge and also longer than the suspended western section of the San Francisco – Oakland Bay Bridge. (That bridge has a longer total suspension but is a double bridge with an anchorage in the middle.) Compare, List of longest bridges in the world and List of longest suspension bridge spans.

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