These are some of the largest waves that I have seen on the Straits
of Mackinac. It was windy enough that
the power was out in Mackinaw City when these photos of the Mackinac
Bridge were taken.
Suspension bridges are designed to move to due to wind, temperature
change and the weight on the bridge.
The roadway of the Mackinac Bridge center span can slowly move as much
as 35 feet east or west in high winds
On rare, extremely windy days, vehicles may be prohibited from crossing
the Mackinac Bridge for a period of time. If the
wind speed averages 65 MPH or more, the bridge will be shut down. It
if reaches 50 MPH high profile vehicles will be
prohibited. At slightly lower wind speeds, high profile vehicles may
be required to have an escort. The
Mackinac Bridge Authority is constantly monitoring the weather and
has wind gages as far away as White Shoal Light.
On November 19, 2015 a gust at the Mackinac Bridge was recorded at
130 miles per hour, equivalent to a Category 4 hurricane.