county line and turns north again near Shinanguag Lake near the Ortonville State Recreation Area outside Goodrich in southeastern Genesee County. South of Davison, M-15 intersects I-69 near the Davison Country Club before running through town. In Otisville, State Road curves around to the west of some small lakes and through town. State Road turns northwesterly again in Millington in southwestern Tuscola County, heading up to Vassar. In Vassar, M-15 intersects and turns northwest along Huron Avenue, a historical routing of M-24, crossing the Cass River in town. Outside Vassar, Huron Avenue becomes Saginaw Road. In western Tuscola County, M-15 intersects M-46 in the community of Richville. The name of the road changes in Saginaw County to Vassar Road, and the trunkline continues northwesterly through the Blumfield Township communities of Blumfield Corners and Arthur. Arthur is located along the highway between the M-83 and M-81 junctions. In Bay County, M-15 follows Tuscola Road where it meets the western terminus of M-138 which runs along Munger Road in Munger. As the highway enters Bay City on the southeast side of town, Tuscola Road leaves the farmlands for residential areas of Bay City. The roadway runs northerwesterly near the St. Stanislaus, St. Patrick and Elm Lawn cemeteries, before turning north on Trumbull Street at 10th Street. The highway follows Trumbull Street for five blocks, where the highway designation ends at a four-way intersection with M-25/Center Avenue. Trumbull Street continues north through this residential section of the city. History Original designation On July 1, 1919, the original routing of M-15 was located in the Upper Peninsula (UP). It ran from the state line along the Menominee River in Menominee, connecting with STH-15 in Wisconsin, running north through the UP to Escanaba, Marquette and Houghton. Between Powers and Escanaba, M-15 ran concurrently with M-12. The northern terminus of the highway was at Fort Wilkins in Copper Harbor. The first highway centerline in the nation was painted along a section of the highway in 1917, along the Marquette–Negaunee Road, now a part of Marquette County Road 492. The Peshekee River Bridge, carried M-15 over the Peshekee River in western Marquette County's Michigamme Township . The bridge was built in 1914 in response to the 1913 State Trunk Line Act passed by the Michigan Legislature. This act designated a state trunkline highway network of nearly . The act further said that the Michigan State Highway Department