 M-31 next ran west along Bradleyville Road to a connection with M-81; the two highways ran concurrently south through Gilford before M-31 separated and turned back westward through Reese to Saginaw.The northern terminus in downtown Saginaw was at an intersection with what was then M-10.When the state highway system was first signed in 1919, M-31 was one of the original trunklines, originally running northward from Port Huron to Harbor Beach and then westward to Saginaw.