Michigan State Highway 66
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Michigan State Highway 66 or M-66 is a north-south state highway in Michigan. The southern terminus is the Indiana state line. where it feeds into and from Indiana State Highway 9 south of Sturgis and gives access to the Indiana Toll Road. The northern terminus is at the junction with U.S. Highway 31 in Charlevoix. M-66 is the only Michigan State Highway to traverse almost the entire north-south distance of the lower peninsula.
All of the freeway Interstate 194, locally known as the Sojourner Truth Memorial Parkway, through greater Battle Creek, Michigan coincides with M-66, which was moved to the freeway.
Total length 269 miles.
M-66 passes through the following counties: St. Joseph County, Branch County, Calhoun County, Barry County, Ionia County, Montcalm County, Mecosta County, Osceola County, Missaukee County, Kalkaska County, Antrim County, Charlevoix County.
M-66 intersects the following major highways:
- U.S. Highway 12 in Sturgis
- Michigan State Highway 60 in St. Joseph and Branch Counties
- Interstate 94 just south of Battle Creek
- Michigan State Highway 96 in Battle Creek
- Interstate 96 in Ionia County
- Michigan State Highway 21 in Ionia
- Michigan State Highway 46 in Montcalm County
- U.S. Highway 10 in Osceola County
- Michigan State Highway 115 in Osceola County
- Michigan State Highway 61 in Osceola County
- Michigan State Highway 55 in Missaukee County
- Michigan State Highway 42 in Missaukee County
- U.S. Highway 131 in Kalkaska County and Antrim County
- Michigan State Highway 72 in Kalkaska
- Michigan State Highway 32 in East Jordan
- U.S. Highway 31 in Charlevoix
Historical note: In the 1930's and 1940's, M-66 was originally designated on what is now M-91 and started at a junction with US-16.