M-66 (Michigan highway)
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M-66 highlighted in red
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| Route information | ||||
| Maintained by MDOT | ||||
| Length: | 266.399 mi (428.728 km) | |||
| Existed: | c. July 1, 1919 – present | |||
| Major junctions | ||||
| South end: |
 SR 9 near Sturgis
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| North end: |
 US 31 at Charlevoix
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| Location | ||||
| Counties: | St. Joseph, Branch, Calhoun, Barry, Ionia, Montcalm, Mecosta, Osceola, Missaukee, Kalkaska, Antrim, Charlevoix | |||
| Highway system | ||||
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M-66 is a north–south state trunkline highway on the Lower Peninsula (LP) of the US state of Michigan. It runs from the Indiana state line in the south to Charlevoix in the north. M-66 is the only state highway to traverse almost the entire north–south distance of the LP. It starts as a continuation of State Road 9 (SR 9) which provides access to the Indiana Toll Road. The total length is 272.898 miles (439.187 km), which includes 3.374 miles (5.430 km) of freeway between Interstate 94 (I-94) and downtown Battle Creek designated as I-194. One section of the highway is an expressway, a type of divided limited access highway, while the section along I-194 is a full freeway, otherwise M-66 is a two-lane rural highway. Two sections are listed on the National Highway System.
The first usage of the M-66 designation dates back to around July 1, 1919 with the rest of the original state highway system. At the time, the highway only extended between Lowell and Lakeview, a route now covered by M-91. The highway has been lengthened in a series of extensions north and south starting in 1925. A rerouting in 1944–45 removed M-66 from its original 1919 routing to replace another highway south of Six Lakes, the change that spawned M-91. The last big extension in 1965 resulted in the modern trans-peninsular highway route. The last modifications were shorter reroutings in the 1970s.
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