M-186 forms an easterly extension of M-113 from
Kingsley to
Fife Lake. The highway starts south of a 90-degree curve in
M-113 and runs east through flat, wooded terrain to Fife Lake. The roadway runs parallel to the survey section lines in Fife Lake Township, and it passes several residences along the whole length. From the eastern terminus, State Street connects M-186 and
US 131 with downtown Fife Lake. In 2007, the
average annual daily traffic (AADT) surveys conducted by the
Michigan Department of Transportation (MDOT) showed that 2,100 vehicles used M-186. M-113 west of M-186 logged an average of 7,800 vehicles a day north of the junction and 4,400 vehicles south of the junction. On the east end, US 131 carried 5,100 vehicles north and 4,800 vehicles south of the junction in Fife Lake. Of the 2,100 vehicles on M-186, only 140 trucks travelled the highway each day on average. ==History==