Wind Archives | Page 2 of 2 | Mackinac Bridge Authority

How are winds measured at the bridge?

Posted on February 14th, 2023

The Mackinac Bridge Authority has wind gauges on the bridge that we use to determine wind advisories and closures.… Read More

Why does my truck bed need to be empty during partial closures? Why can’t I have a tonneau cover? It stays on when I’m driving 75 on the expressway. What about camper awnings?

Posted on February 14th, 2023

Though our maximum speed limit on the bridge is 45 mph (and lower during high wind conditions), unfortunately we have seen many tonneau covers that stay on at freeway speeds come loose on the bridge. For whatever reason, high wind at the Straits seems to be stronger than tonneau fastening systems. When a tonneau cover… Read More

What vehicles are considered high-profile?

Posted on February 14th, 2023

When considering a high-wind escort or partial closure, high-profile vehicles would include but are not limited to:

Semi-tractor trailers
Recreational vehicles and campers
Pickup trucks with cappers, tonneau covers, or any items in the truck bed
Panel trucks and vans
Enclosed trailers (such as snowmobile or AT

How did the Mackinac Bridge Authority determine what wind speeds resulted in advisories and closures?

Posted on February 14th, 2023

The current procedures were developed primarily through years of experience, learning what wind speeds cause issues for particular vehicles. We’ve learned lessons from previous incidents, improved the devices we use to measure the wind, the way we convey that information through message boards and the bridg… Read More

What wind conditions result in high wind warnings, escorts, partial closures, and full closures?

Posted on February 14th, 2023

Here are the speeds that trigger different wind warnings and closures. These speeds are not for gusts; they are sustained winds from any direction. These are minimum conditions resulting in advisories and closures but restrictions may be put in place at lower wind speeds if other hazardous conditions are present:… Read More