 The first changes to the routing of US 2 itself were made in 1930 with a bypass of downtown <unk> . A larger <unk> was completed in 1933 between Rogers Park and <unk> <unk> . Marie . The new routing followed Mackinac Trail instead of turning east to <unk> and north to <unk> <unk> . Marie ; the former routing was given the M ‑ 121 designation . Another realignment in the Iron Mountain area shifted US 2 / US 141 to a new bridge over the <unk> River between 1932 and 1934 . Downtown <unk> was bypassed in 1934 , and the former route was initially designated M ‑ 54 . 
