there it used today's routing of M-28 eastward to Newberry and Sault Ste. Marie. This designation was replaced by M-28 in 1927. Current designation In 1933, US 25 was extended north from Port Huron to Port Austin. along M-29. M-25 was designated along the portion of M-29 disconnected by the US 25 extension, from Bay City to Port Austin. M-25 was extended along US 25 to Port Huron when the latter was removed from Michigan in 1973. The southern terminus was placed at I-94 in Marysville, Michigan until it was moved northward to end at BL I-94 (now BL I-69/BL I-94) in 1987. The section of M-25 in the City of Bay City was named what is now called a Pure Michigan Historic Byway by the Michigan Department of Transportation (MDOT). This designation was created on October 23, 1997, for the section of M-25 along Center Avenue between Madison Avenue and the eastern city limits. Originally called the Bay City Historic Heritage Route", it has been called the Center Avenue Heritage Route by its local stewardship committee. Major intersections See also References External links M-25 at Michigan Highways M-25 at Michigan Highway Ends 025 Lake Huron Circle Tour U.S. Route 25 Dixie Highway Transportation in St. Clair County, Michigan Transportation in Sanilac County, Michigan Transportation in Huron County, Michigan Transportation in Tuscola County, Michigan Transportation in Bay County, Michigan