05/26/2026
Hi, it's your pal Buster again. Behind me is the famous Mackinac Bridge, also called the "Mighty Mac."
The Mackinac Bridge connects the lower and upper peninsulas of Michigan, right where Lake Huron and Lake Michigan meet. On the north side of the bridge is St. Ignace on the Upper Peninsula, and on the south end is Mackinaw City.
At 8,614 feet, the Mackinac Bridge is the longest suspension bridge in the western hemisphere (North and South America). That's one and two-thirds of a mile! When it was completed in 1957, the Mackinac Bridge was the longest suspension bridge in the world, but longer ones have been built in other parts of the world since then.
Its towers are 552 feet tall above the water, and 3,800 feet apart. At its maximum rise, the bottom of the bridge is around 200 feet above the water, high enough to allow large container ships to pass underneath.
A suspension bridge is a bridge with overhead cables supported by towers, with a roadway suspended (or hanging) underneath. The curved cable and the suspension cables are in tension (tension is pulling force) and the towers are in compression (pushing force). This combination of forces holds the roadway up. (See the drawing I have attached.)
Suspension bridges can cross longer distances than any other bridge type.
Some early suspension bridges had trouble with stability. (Watch a video of the Tacoma Narrows Bridge, if you don't believe me!) But the design of the Mackinac Bridge avoids these problems because of the truss supporting the roadbed, which you can see in my fourth photo.
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