 By July 1 , 1919 , M @-@ 18 was first designated on a routing that ran between M @-@ 46 west of Merrill through Edenville to M @-@ 14 ( later US 27 ) in Prudenville . The highway south of Beaverton was realigned to run due south a new terminus at North Bradley along the new US 10 in late 1926 . The former routing between Beaverton and M @-@ 30 north of Edenville was redesignated M @-@ 80 , and the highway from the M @-@ 30 junction south to M @-@ 46 became an extended M @-@ 30 . At the same time , the north end was extended along US 27 to end at M @-@ 76 in Roscommon . The northern extension was scaled back in 1941 to Prudenville . 
