 In 1928 , M @-@ 111 was assigned to a route connecting M @-@ 13 ( later signed as US 23 for a time ) north of Bay City to Bay City State Park on Saginaw Bay . The original route consisted of what is today Euclid Avenue . In the early 1930s , a return leg towards Bay City was added to the east of the original route along what is now State Park Road , giving the route an upside @-@ down @-@ U <unk> 1933 , the western leg along Euclid Avenue from Midland Road to Beaver Road was designated as M @-@ 47 . In 1938 , all of M @-@ 111 was re @-@ designated as M @-@ 47 — thus making M @-@ 47 double back to Bay City . 
