Mackinac Bridge Authority

Spanning the Straits of Mackinac since 1957

What type of expansion joints are used on the Mackinac Bridge? How many?

Posted on October 14th, 2016

Answer:
There are two large finger joints at the towers to accommodate all the expansion of the suspended spans. There are 11 smaller finger joints and 5 sliding joints across the Mackinac Bridge. In addition, there are 13 expansion joints for the south viaduct spans – one for each of these simple spans. This adds up to a total of 31 total joints.

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