 Starting in 1953 , the westernmost approximately one mile ( 1 @.@ 6 km ) of M @-@ 81 was also used for a US 23 concurrency . When the bypass of Saginaw was completed in late 1961 , M @-@ 81 was extended along M @-@ 13 southwesterly into downtown Saginaw where it turned west across the Saginaw River to Midland Road west of the city . This routing across the city was removed in 1971 when I @-@ <unk> was completed ; west of that freeway the highway became M @-@ 58 , the rest was either removed from the highway system and turned back to local control , or it had the M @-@ 81 designation removed . Since this truncation , M @-@ 81 has ended at its junction with M @-@ 13 north of downtown Saginaw . In 2006 , MDOT completed the reconstruction of the interchange between M @-@ 81 and I @-@ 75 / US to incorporate a pair of roundabouts along Washington Road . 
