Mackinac Bridge Authority

Spanning the Straits of Mackinac since 1957

How much does the Mackinac Bridge “swing” or “sway” in the wind?

Posted on October 14th, 2016

All suspension bridges are designed to move to accommodate wind, change in temperature, and weight. It is possible that the deck at center span could move as much as 35 feet (east or west) due to high winds. This would only happen under severe wind conditions. The deck would not swing or “sway” but rather move slowly in one direction based on the force and direction of the wind. After the wind subsides, the weight of the vehicles crossing would slowly move it back into center position.

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