The junction with US-24 just south of Clarkston on the northwestern edge of Metro Detroit is the southern point of the byway. M-15 runs north and northwest to Bay City, joining up with M-25 at the Bay City Center Avenue Byway. Every year on the first Saturday of May, the M-15 Yard Sale is held from Clarkston to Vassar.
About the M-15 Recreational Heritage Route
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