Two years later, however, State Route 186 was shortened to the routing that it has today when the former State Route 69 (now State Route 235) was extended north from McComb over what was the segment of State Route 186 from there to State Route 65.
In 1937, State Route 186 was extended north along the current alignment of State Route 235 from Hoytville to that highway's current northern terminus at State Route 65 along the Maumee River northeast of Grand Rapids.