M-57 (Michigan highway)

M-57
M-57
	M-57 highlighted in red
Route information
	Maintained by MDOT
Length	105.377 mi (169.588 km)
Existed	1930–present
Major junctions
West end	US 131 near Rockford
	M-66 near Sheridan; US 127 in Washington Township; M-52 near Chesaning; M-13 near Montrose; I-75 / US 23 near Clio; M-54 near Clio;
East end	M-15 near Otisville
Location
Country	United States
State	Michigan
Counties	Kent, Montcalm, Gratiot, Saginaw, Genesee
Highway system
	Michigan State Trunkline Highway System; Interstate; US; State; Byways;

M-57 is an east–west state trunkline highway in the US state of Michigan. The 105.377-mile (169.588 km) highway connects US Highway 131 (US 131) near Rockford on the west end to M-15 near Otisville in the Lower Peninsula. In between, the mostly rural highway passes through farmland and connects several highways and smaller towns together. Three of these highways are freeways: US 131, US 127 and Interstate 75 (I-75). Along the way, between 3,700 and 22,300 vehicles use the highway daily.

The current highway that bears the M-57 moniker is the second to do so. The first is now M-75 in the Northern Lower Peninsula. This second highway was designated in the 1930s along a different, but parallel, routing. The first major changes shifted that routing southward to the current corridor in stages. Through additional extensions and truncations, the modern routing was formed by the 1970s.