High Quality Content by WIKIPEDIA articles! M-115 is a state trunkline highway in the northwestern part of the Lower Peninsula of the US state of Michigan. The highway takes a generally southeast-to-northwest direction between Clare and Frankfort on Lake Michigan. The southeastern end in downtown Clare is at an intersection with Business US Highway 127 (BUS US 127) and BUS US 10; the northwestern end is at M-22 next to Betsie Lake. In between, the trunkline runs 96.432 miles (155.192 km) through woodlands, including areas that are a part of either the Manistee National Forest or the Pere Marquette State Forest. The highway also passes agricultural areas, several lakes in the region and a state park near Cadillac.