 A rerouting in late 1971 moved the US 45 designation along M-26 between Rockland and Greenland. From Greenland, US 45 followed Ontonagon – Greenland Road to Ontonagon. In late 1973, MDOT reversed the rerouting — US 45 was restored to its previous routing on Rockland Road between Rockland and Ontonagon and M-26 was re-extended south from Greenland to Rockland; M-38 was extended west along Ontonagon – Greenland Road.
