ht en aw ▁and ▁Wayne . ▁ ▁History ▁Since ▁the ▁highway ' s ▁creation ▁in ▁ 1 9 2 6 , ▁the ▁eastern ▁termin us ▁has ▁always ▁remained ▁within ▁a ▁few ▁blocks ▁of ▁this ▁point . ▁▁ 1 9 2 6 : ▁Cad illa c ▁Square ▁at ▁the ▁convergence ▁with ▁US   1 0 , ▁US   1 6 , ▁US   2 5 ▁and ▁US   1 1 2 ; ▁US   1 2 ▁ran ▁along ▁Grand ▁River . ▁The ▁original ▁ending ▁was ▁at ▁Mil es ▁City , ▁Mont ana . ▁▁ 1 9 3 9 : ▁The ▁American ▁Association ▁of ▁State ▁Highway ▁Official s ▁( then ▁A AS HO , ▁now ▁A AS HT O ) ▁approved ▁a ▁request ▁to ▁extend ▁US   1 2 ▁to ▁Y ellow stone ▁National ▁Park . ▁▁ 1 9 5 6 : ▁US   1 2 ▁was ▁r er out ed ▁along ▁the ▁L odge ▁Fre ew ay , ▁ending ▁on ▁Jefferson ; ▁the ▁termin us ▁moved ▁four ▁blocks ▁sout heast , ▁to ▁the ▁corner ▁of ▁Wood ward ▁Avenue ▁( US   1 0 ) ▁and ▁Jefferson ▁Avenue . ▁▁ 1 9 5 9 : ▁Ext ended ▁to ▁Miss ou la , ▁Mont ana . ▁▁ 1 9 6 2 : ▁After ▁I - 9 4 ▁was ▁completed ▁across ▁Michigan , ▁it ▁was ▁no ▁longer ▁co - signed ▁with ▁US   1 2 . ▁ ▁The ▁US   1 2 ▁route ▁design ation ▁was ▁moved ▁to ▁the ▁former ▁route ▁of ▁US   1 1 2