H-63 (Michigan county highway)

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County-Designated Highway H-63 runs generally parallel to and within a few miles of I-75 from the northern limits of St. Ignace (near Castle Rock) to Sault Ste. Marie. This segment of highway is also a relic of former U.S. Highway 2 between those cities. As I-75 was constructed between St. Ignace and Sault Ste. Marie, the US 2 designation was transferred to the freeway with the former route being turned back to local control. In the early 1970s, the former route of US 2 along Mackinac Trail was designated as H-63.

H-63 is known as Mackinac Trail for its entire length.