M-129 (Michigan highway)

M-129
M-129 highlighted in red
Route information
Maintained by MDOT
Length	33.223 mi[1] (53.467 km)
Existed	1939[2]–present
Tourist routes	Lake Huron Circle Tour
Major junctions
South end	M-134 in Cedarville
Major intersections	M-48 in Pickford M-80 near Donaldson M-28 near Dafter
North end	BL I-75 in Sault Ste. Marie
Location
Country	United States
State	Michigan
Counties	Mackinac, Chippewa
Highway system
Michigan State Trunkline Highway System Interstate US State Byways
← Bus. US 127 → M-130

M-129 is a state trunkline highway in the Upper Peninsula (UP) of the US state of Michigan. It runs from Cedarville to Sault Ste. Marie. South of Nine Mile Road in Chippewa County (and in all of Mackinac County), M-129 overlays the Michigan Meridian. The section of M-129 that overlays the meridian is named Meridian Road. The highway between M-48 and the northern terminus is a part of the larger Lake Huron Circle Tour.

Originally a part of M-12 and US Highway 2 (US 2), the current roadway was formerly designated M-5 from 1930 until 1939. Two other highways were also previously designated M-129. The first was in the western UP in the late 1920s; it was replaced by M-64. The second was in the Keweenaw Peninsula and was replaced by M-26.