The fog is expected to diminish late Wednesday morning.

Island authorities will never tell you it's safe to cross the ice bridge. It's always seen as an at-your-own risk activity in the years that the bridge forms.

Add Yahoo as a preferred source to see more of our stories on Google. Mackinac Bridge officials are cautioning the public that winter ice accumulation on the structure could force the span's closure for undetermined lengths of time, and to plan accordingly.

A blowing snow warning was issued for the Mackinac Bridge Monday.