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

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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