NABSQNO 16T-685794-5081031
Arch Rock, Mackinac County, Michigan
Photo by Jay Wilbur
NABSQNO 16T-685794-5081031. Arch Rock is a sea natural arch eroded through a remnant of a limestone cliff that was at one time the shore of Lake Nipissing, a predecessor of Lakes Huron and Michigan. Because the lake level has dropped significantly in recent times and left the arch isolated and well above the waves, it has avoided the usually short lifespan typical of sea natural arches. Indeed, Arch Rock is probably about 3500 years old. Arch Rock is located on the east side of Mackinac Island, Michigan. Access is via a ferry from Mackinaw City followed by a 1.3 mile walk along the paved shore road. It was listed as number 14-1 in the Vreeland catalog. Vreeland reported a span of 50 feet for the arch. Here is a photo of Arch Rock from above. MAP