text: m - 91 ( michigan highway ) m - 91 is a largely north – south state trunkline highway in the lower peninsula of the us state of michigan . it runs from belding to south of lakeview . its 24 - mile ( 39 km ) length exists entirely within ionia and montcalm counties . it is all undivided surface route . aside from the two michigan state highways that are its termini , it has only one other with any michigan state highway , and that is with m - 57 in greenville . m - 91 was formed when m - 66 was rerouted in the 1940s . at the time , the highway continued south to lowell , but subsequent transfers or roadway sections have truncated the route to its present form . for a time period in the 1980s , m - 91 was even a discontinuous highway when a section in the middle was transferred to county control before the southernmost section was transferred . route description m - 91 starts at an intersection with m - 44 west of belding in otisco township . the road runs north along storey road and past the golf course and farmlands . at bricker road , m - 91 crosses out of ionia county into montcalm county . the trunkline runs along greenville road and passes the greenville municipal airport . as it continues north , the highway curves to the northeast running between the flat river and baldwin , como and lakes . as it enters the south side of greenville , m - 91 runs along on lafayette street . in the center of greenville , m - 91 meets m - 57 on washington street . north of downtown , m - 91 crosses a bend in the flat river and continues to parallel the river on the east out of town . in rural montcalm county , m - 91 is once again named greenville road and it curves to the west of turk lake and continues due north to the community of langston . north of langston are tacoma , west and spring lakes . further north , m - 91 curves to the northwest around farnsworth lake , resuming its due - north course a mile ( 1 . 6 km ) to the west . running through farmlands again , m - 91 terminates at an intersection with m - 46 in lakeview , just south of tamarack lake . history previous designations the first routing of m - 91 in michigan was located between menominee and cedar river in the upper peninsula . this routing was designated by july 1 , 1919 . the designation remained until sometime before december 1927 when it was replaced by m - 35 . in 1927 , all of the current m - 91 was originally part of m - 66 . a second usage of m - 91 was designated from rogers city towards cheboygan county along the lake huron shore by 1930 . it became part of us 23 by the end of 1940 . current designation m - 91 was designated for the third time by june 1942 . the number was assigned between us 16 ( cascade road / grand river avenue ) south of lowell running northeast along alden nash avenue into lowell and lincoln lake road north of town . the highway followed lincoln lake road to m - 44 east of belding and turned to run concurrently along m - 44 to the belding area . from there it ran north to greenville and on to lakeview along the present route . the last section of gravel roadway was paved in ionia county in 1954 . the highway designation was extended south to the then - new us 16 freeway ( now interstate 96 ) around 1958 . it was later truncated back to m - 21 in lowell in 1968 . by 1980 , the section of m - 91 in ionia county south of m - 44 to the kent county line was turned back to local control . the highway section in kent county remained marked as m - 91 , resulting in a discontinuous highway . the southern section between lowell and the county line was turned back by 1985 , resulting in the modern routing of m - 91 . major intersections