The Mackinac Lighthouse has a long history that pre-dates European arrival. Native Americans lite fires on the banks so they could navigate the straits. When larger European ships arrived a light house was constructed to determine points of entry. When the Mackinac Bridge turned on its lights in more modern times no one needed the light house anymore as a navigational tool.
It is helpful to understand that lighthouses were a key part of the supply chain. Without them our economic world would be limited and expansion difficult. The Great Lakes were a major shipping lane. The cost of lighthouses was a type of insurance policy.
https://en.wikipedia.org/wiki/Old_Mackinac_Point_Light
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