M-151 was a state trunkline highway

Michigan Highway System

The Michigan State Trunkline Highway System is made up of all the highways designated as Interstates, U.S. Highways and State Highways in the US state of Michigan. The system is maintained by the Michigan Department of Transportation and comprises of trunklines in all 83 counties of Michigan on...

 in the US state of Michigan

Michigan

Michigan is a U.S. state located in the Great Lakes Region of the United States of America. The name Michigan is the French form of the Ojibwa word mishigamaa, meaning "large water" or "large lake"....

. Two routes carried this designation. The first was a connector route from US 112

U.S. Route 112

U.S. Route 112 was a largely east–west state trunkline highway across the southern portion of the US state of Michigan between New Buffalo and Detroit...

 to Niles

Niles, Michigan

Niles is a city in Berrien and Cass counties in the U.S. state of Michigan, near South Bend, Indiana. The population was 11,600 at the 2010 census. It is the greater populated of two principal cities of and included in the Niles-Benton Harbor, Michigan Metropolitan Statistical Area, which has a...

 along the routing of today's US 12

U.S. Route 12 in Michigan

US Highway 12 is a US Highway that runs from Aberdeen, Washington to Detroit, Michigan. In the US state of Michigan it runs for . Previous to the creation of Interstate Highways in Michigan, US 12 ran along Michigan Avenue between Kalamazoo and Detroit, a highway corridor now served by I-94...

. The second traveled from US 223

U.S. Route 223

US Route 223 or US Highway 223 is a diagonal US Highway lying in the US states of Michigan and Ohio. The southern most section is completely concurrent with the US 23 freeway, including all of the Ohio segment. It connects US 23 in the south near Toledo, Ohio with US 127 and...

 to US 25

U.S. Route 25

U.S. Route 25 is a north–south United States highway that runs for from Brunswick, Georgia to the Ohio state line in Covington, Kentucky.-Georgia:...

 in southern Monroe County

Monroe County, Michigan

Monroe County is a county in the U.S. state of Michigan. According to the U.S. Census Bureau, the 2010 population is 152,021. The largest city and county seat is Monroe. The U.S. Census Bureau defines all of Monroe County as conterminous with the Monroe Metropolitan Area...

.

Route description

M-151 began on Saint Anthony Road at a junction with US 223 just north of Ottawa Lake. The route passed through rural areas as it traveled east towards Monroe

Monroe, Michigan

Monroe is a city in the U.S. state of Michigan. The population was 20,733 at the 2010 census. It is the largest city and county seat of Monroe County. The city is bordered on the south by Monroe Charter Township, but both are politically independent. The city is located approximately 14 miles ...

. About five miles (8 km) prior to its junction with US 23

U.S. Route 23 in Michigan

US Highway 23 is a United States Numbered Highway that runs from Jacksonville, Florida to Mackinaw City, Michigan. In the US state of Michigan, it is a major north–south state trunkline highway that runs through the Lower Peninsula...

, the road jogged to the north onto Secor before returning to the east on Samaria Road. The road passed through the small community of Samaria before junctioning with US 23. Just a few miles afterwards the road intersected US 24 before terminating about a half mile later at a junction with US 25

U.S. Route 25

U.S. Route 25 is a north–south United States highway that runs for from Brunswick, Georgia to the Ohio state line in Covington, Kentucky.-Georgia:...

.

History

M-151 was added to the state trunkline system in 1931. At that time, the road served as a connector between Niles

Niles, Michigan

Niles is a city in Berrien and Cass counties in the U.S. state of Michigan, near South Bend, Indiana. The population was 11,600 at the 2010 census. It is the greater populated of two principal cities of and included in the Niles-Benton Harbor, Michigan Metropolitan Statistical Area, which has a...

 and US 112

U.S. Route 112

U.S. Route 112 was a largely east–west state trunkline highway across the southern portion of the US state of Michigan between New Buffalo and Detroit...

. The eastern terminus of this segment was at the present day junction of US 12

U.S. Route 12 in Michigan

US Highway 12 is a US Highway that runs from Aberdeen, Washington to Detroit, Michigan. In the US state of Michigan it runs for . Previous to the creation of Interstate Highways in Michigan, US 12 ran along Michigan Avenue between Kalamazoo and Detroit, a highway corridor now served by I-94...

 and Old M-205

M-205 (Michigan highway)

M-205 was a state trunkline highway in the US state of Michigan. The route was turned back to local control in October 2002 by the Michigan Department of Transportation after the completion of M-217/Michiana Parkway...

. In 1935, the designation was removed from this alignment and shifted to a new one between US 223 and US 25 in the southeastern portion of the state. The route continued in this capacity until 1965 when all of the road east of US 23 was turned back to local control, and the remaining portion was consumed by a new routing of US 223. The designation has not been used since this time. Locally, even though it is no longer part of the state highway system, the road is still referred to as "M-151."

Major intersections