 By 1936, the highway was lengthened northwards to end in Glennie; a second segment was also added that ran north from the Alcona–Alpena county line to Lachine.Around the end of the decade, US 23's routing was moved in another location to follow the lakeshore; this time the highway was rerouted between Alpena and Rogers City.M-65 was extended northwards from Lachine through Posen to terminate at M-91 downtown Rogers City.