Just outside the north breakwater at Mackinac Island, Round Island Passage Light is an automated, unmanned lighthouse located in the Round Island Channel in the Straits of Mackinac, Michigan. Built in 1948 to mark the northern side of the navigable channel. According to Wikipedia, the Passage Light was one of the last lights to be constructed on the Great Lakes, and was relighted as a private aid to navigation in 1996.
Still from wikipedia: The Round Island Passage Light is constructed on a timber crib foundation which is 56 feet square. The timber crib has perimeter cells filled with concrete, and internal cells filled with rock. Atop the crib is a concrete superstructure with a 41-foot square reinforced concrete deck. The superstructure is octagonal, with four vertical and four sloping sides. Atop the tower's concrete deck is a red-painted enclosure, 11-feet high. Above the enclosure is a five-story octagonal steel tower, 41-1/2 feet high and 12 feet across. Each side of the tower contains a four-foot bronze relief Indian head, commemorating the fact that Mackinac Island was a sacred spot for Native American tribes. The light originally had a 47-foot steel antenna atop the tower, but it was removed in the early 2000s.
Here's a snip from Google Earth, showing where the lighthouse is. (not my photo!):
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