M-99 (Michigan highway)

M-99
M-99
	M-99 highlighted in red
Route information
	Maintained by MDOT
Length	86.058 mi (138.497 km)
Existed	1940–present
Major junctions
South end	SR 15 near Pioneer, OH
	M-34 near Osseo; US 12 in Jonesville; M-49 in Litchfield; M-60 in Homer; I-94 near Albion; M-50 in Eaton Rapids; I-96 in Lansing;
North end	I-496 in Lansing
Location
Country	United States
State	Michigan
Counties	Hillsdale, Calhoun, Jackson, Eaton, Ingham
Highway system
	Michigan State Trunkline Highway System; Interstate; US; State; Byways;

M-99 is a north–south state trunkline highway in the Lower Peninsula of the US state of Michigan. It runs from the Ohio state border, where it connects to State Route 15 (SR 15), north to Lansing, where it terminates at a junction with Interstate 496 (I-496). The highway mainly serves local communities along the route as it passes through farm lands in the southern part of the state. One short segment, in Jonesville, is routed concurrently with US Highway 12 (US 12). The segment within Lansing follows Martin Luther King Jr. Boulevard.

The current highway is the third to carry the M-99 designation. The others were located near Lake Michigan near Muskegon in the Lower Peninsula and Gulliver in the Upper Peninsula in the 1920s and 1930s. The current highway was first designated as parts of M-34 and M-64 in 1919. These numbers were later dropped in favor of an M-9 designation in 1929. For part of 1934, a loop route was designated M-158 in Hillsdale County that was used for a rerouted M-9 in the area. The M-99 designation was applied to the highway in 1940. Since then, the state has completed paving twice; one segment was returned to gravel surface for two years in the 1950s. The southern section in Hillsdale County was rerouted in the 1960s, and sections were converted into divided highways in the late 1970s.

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M-99 (Michigan highway)

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