The bridge has already closed four times this winter for falling ice. Authorities warn garage door-sized sheets could fall hundreds of feet.

The Mackinac Bridge Authority issued warnings Wednesday night as half an inch of ice formed on cables and towers, with potential closures ahead as temperatures stay below freezing.

Add Yahoo as a preferred source to see more of our stories on Google. The Mackinac Bridge was closed on several occasions in recent days when falling ice made crossing the bridge unsafe for vehicles.

The Mackinac Bridge Authority says falling ice may cause the bridge to close starting Friday, Feb. 27.

ST. IGNACE, Mich — With a warm-up happening this weekend, the Mackinac Bridge Authority (MBA) says it's prime time for what ice remains on Mighty Mack's cables to come down. That being said, don't be ...

The Mackinac Bridge Authority warned that the possibility of future closures remains as there is still ice on the upper cables and towers of the bridge.