Mackinac Bridge Authority

Spanning the Straits of Mackinac since 1957

How long does a typical falling ice closure last?

Posted on November 10th, 2022

The shortest closure was 37 minutes on Nov. 29, 2001. The longest closure to date was 20 hours and 15 minutes in a closure that started Feb. 23, 2019, and ended Feb. 24, 2019. The average closure lasts about five hours and 9 minutes. Over the last 28 years, which is roughly 244,608 hours, the bridge has been closed 144 hours and 39 minutes for falling ice, less than 0.06 percent of the time.

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