ac Trail instead of turning east to Cedarville and north to Sault Ste . 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 Menominee River between 1932 and 1934 . Downtown Ironwood was bypassed in 1934 , and the former route was initially designated M ‑ 54 .   The Michigan State Highway Department ( MSHD ) changed the routings and designations of the highways around Cooks , Thompson and Manistique in the mid @-@ 1930s . The agency rerouted US 2 between Cooks and M ‑ 149 in Thompson , turning the old road back to county control . The section between M ‑ 149 and M ‑ 125 was redesignated as an extension of M ‑ 149 to Thompson , and M ‑ 125 was replaced by a further extension of M ‑ 149 . The last change was to route US 2 along its current alignment in the area , completing the changes on August 2 , 1936 .   The MSHD started construction in 1936 on a new road that rerouted US 2 into St. Ignace for the first time . Between Brevort and Moran , US 2 previously followed Worth Road inland to the Tahquamenon Trail to meet the northern extension of US 31 into the Upper Peninsula . The new routing took US 2 along the lakeshore into St. Ignace . US 31 was truncated to the state ferry docks in Mackinaw City and US 2 was routed through St. Ignace along the former US 31 to Rogers Park ; the connection in St. Ignace to the state ferry docks became M ‑ 122 . Further changes in the early 1940s straightened the roadway out near Watersmeet and Crystal Falls .   Additional realignments were completed by the MSHD to move US 2 to its modern lakeshore routing between Gould City and Epoufette in 1941 . The new highway traveled due east from Gould City to Naubinway and then along the lake to Epoufette . The former route through Engadine was turned back to local control as far east as Garnet . From there east , it was numbered just M ‑ 48 , removing US 2 from a concurrency . Another former section into Epoufette was added to extend M ‑ 117 . The new highway was detoured around the Cut River Bridge until it was completed in 1946 after construction delays over steel shortages during World War II .   The western end of US 2 took on two changes in the 1940s . M ‑ 28 was extended along US 2 to the state line at Ironwood from its western terminus at Wakefield . A similar extension was made from M ‑ 28 's eastern terminus to Sault Ste . Marie in 1948 . The M ‑ 54 designation was renumbered as Business US 2 by 1945 . The eastern M ‑ 28 extension was reversed in 1950 , and the western extension to the state line was shifted to a new location by 1952 .   = = = Interstate era = = =   With the coming of the Interstate Highway System in Michigan , the MSHD planned to convert the eastern section of US 2 to a freeway between St. Ignace and Sault St. Marie . In planning maps from 1947 , this highway corridor was included in the system that later became the Interstates . It was also included in the General Location of National System of Interstate Highways Including All Additional Routes at Urban Areas Designated in September 1955 , or Yellow Book after the cover color , that was released in 1955 as the federal government readied plans for the freeway system . The proposed number in 1958 was Interstate 75 ( I ‑ 75 ) .   The first section of freeway was built in late 1957 or early 1958 between Evergreen Shores and M ‑ 123 north of St. Ignace . The Mackinac Bridge was opened to traffic on November 1 , 1957 ; a new section of freeway and an interchange connected US 2 to the bridge . In 1961 , another new freeway segment closed the gap between the Mackinac Bridge and Evergreen Shores sections . At the time , the I ‑ 75 designation supplanted US 27 on the bridge , and US 2 was shifted to follow I ‑ 75 along the freeways in the St. Ignace area . The former routing of US 2 in downtown St. Ignace was redesignated BL I ‑ 75 . More sections of freeway were opened in 1962 immediately to the south of the newly constructed International Bridge in Sault Ste . Marie as well as between Dafter and Kinross . The last two sections opened in 1963 connected the northern end of the freeway at M ‑ 123 to Kinross , and the section between Dafter and Sault Ste . Marie . At this time , all of US 2 's former routing became a county road known as Mackinac Trail ( H @-@ 63 ) .   The Department of State Highways expanded US 2 / US 41 into an expressway
ac ĠTrail Ġinstead Ġof Ġturning Ġeast Ġto ĠCedar ville Ġand Ġnorth Ġto ĠS ault ĠSte Ġ. ĠMarie Ġ; Ġthe Ġformer Ġrouting Ġwas Ġgiven Ġthe ĠM ĠâĢ ĳ Ġ121 Ġdesignation Ġ. ĠAnother Ġreal ignment Ġin Ġthe ĠIron ĠMountain Ġarea Ġshifted ĠUS Ġ2 Ġ/ ĠUS Ġ141 Ġto Ġa Ġnew Ġbridge Ġover Ġthe ĠMen om ine e ĠRiver Ġbetween Ġ1932 Ġand Ġ1934 Ġ. ĠDowntown ĠIron wood Ġwas Ġbypass ed Ġin Ġ1934 Ġ, Ġand Ġthe Ġformer Ġroute Ġwas Ġinitially Ġdesignated ĠM ĠâĢ ĳ Ġ54 Ġ. Ġ Ġ ĠThe ĠMichigan ĠState ĠHighway ĠDepartment Ġ( ĠMS HD Ġ) Ġchanged Ġthe Ġrout ings Ġand Ġdesign ations Ġof Ġthe Ġhighways Ġaround ĠCook s Ġ, ĠThompson Ġand ĠMan ist ique Ġin Ġthe Ġmid Ġ@ - @ Ġ1930 s Ġ. ĠThe Ġagency Ġre r outed ĠUS Ġ2 Ġbetween ĠCook s Ġand ĠM ĠâĢ ĳ Ġ149 Ġin ĠThompson Ġ, Ġturning Ġthe Ġold Ġroad Ġback Ġto Ġcounty Ġcontrol Ġ. ĠThe Ġsection Ġbetween ĠM ĠâĢ ĳ Ġ149 Ġand ĠM ĠâĢ ĳ Ġ125 Ġwas Ġredesign ated Ġas Ġan Ġextension Ġof ĠM ĠâĢ ĳ Ġ149 Ġto ĠThompson Ġ, Ġand ĠM ĠâĢ ĳ Ġ125 Ġwas Ġreplaced Ġby Ġa Ġfurther Ġextension Ġof ĠM ĠâĢ ĳ Ġ149 Ġ. ĠThe Ġlast Ġchange Ġwas Ġto Ġroute ĠUS Ġ2 Ġalong Ġits Ġcurrent Ġalignment Ġin Ġthe Ġarea Ġ, Ġcompleting Ġthe Ġchanges Ġon ĠAugust Ġ2 Ġ, Ġ1936 Ġ. Ġ Ġ ĠThe ĠMS HD Ġstarted Ġconstruction Ġin Ġ1936 Ġon Ġa Ġnew Ġroad Ġthat Ġre r outed ĠUS Ġ2 Ġinto ĠSt . ĠIgn ace Ġfor Ġthe Ġfirst Ġtime Ġ. ĠBetween ĠBre v ort Ġand ĠMoran Ġ, ĠUS Ġ2 Ġpreviously Ġfollowed ĠWorth ĠRoad Ġinland Ġto Ġthe ĠTah qu amen on ĠTrail Ġto Ġmeet Ġthe Ġnorthern Ġextension Ġof ĠUS Ġ31 Ġinto Ġthe ĠUpper ĠPeninsula Ġ. ĠThe Ġnew Ġrouting Ġtook ĠUS Ġ2 Ġalong Ġthe Ġlakes h ore Ġinto ĠSt . ĠIgn ace Ġ. ĠUS Ġ31 Ġwas Ġtrunc ated Ġto Ġthe Ġstate Ġferry Ġdocks Ġin ĠMack in aw ĠCity Ġand ĠUS Ġ2 Ġwas Ġrouted Ġthrough ĠSt . ĠIgn ace Ġalong Ġthe Ġformer ĠUS Ġ31 Ġto ĠRogers ĠPark Ġ; Ġthe Ġconnection Ġin ĠSt . ĠIgn ace Ġto Ġthe Ġstate Ġferry Ġdocks Ġbecame ĠM ĠâĢ ĳ Ġ122 Ġ. ĠFurther Ġchanges Ġin Ġthe Ġearly Ġ1940 s Ġstraight ened Ġthe Ġroadway Ġout Ġnear ĠWaters meet Ġand ĠCrystal ĠFalls Ġ. Ġ Ġ ĠAdditional Ġreal ign ments Ġwere Ġcompleted Ġby Ġthe ĠMS HD Ġto Ġmove ĠUS Ġ2 Ġto Ġits Ġmodern Ġlakes h ore Ġrouting Ġbetween ĠGould ĠCity Ġand ĠEp ouf ette Ġin Ġ1941 Ġ. ĠThe Ġnew Ġhighway Ġtraveled Ġdue Ġeast Ġfrom ĠGould ĠCity Ġto ĠNa ub in way Ġand Ġthen Ġalong Ġthe Ġlake Ġto ĠEp ouf ette Ġ. ĠThe Ġformer Ġroute Ġthrough ĠEng ad ine Ġwas Ġturned Ġback Ġto Ġlocal Ġcontrol Ġas Ġfar Ġeast Ġas ĠGarn et Ġ. ĠFrom Ġthere Ġeast Ġ, Ġit Ġwas Ġnumbered Ġjust ĠM ĠâĢ ĳ Ġ48 Ġ, Ġremoving ĠUS Ġ2 Ġfrom Ġa Ġconc urrency Ġ. ĠAnother Ġformer Ġsection Ġinto ĠEp ouf ette Ġwas Ġadded Ġto Ġextend ĠM ĠâĢ ĳ Ġ117 Ġ. ĠThe Ġnew Ġhighway Ġwas Ġdet oured Ġaround Ġthe ĠCut ĠRiver ĠBridge Ġuntil Ġit Ġwas Ġcompleted Ġin Ġ1946 Ġafter Ġconstruction Ġdelays Ġover Ġsteel Ġshortages Ġduring ĠWorld ĠWar ĠII Ġ. Ġ Ġ ĠThe Ġwestern Ġend Ġof ĠUS Ġ2 Ġtook Ġon Ġtwo Ġchanges Ġin Ġthe Ġ1940 s Ġ. ĠM ĠâĢ ĳ Ġ28 Ġwas Ġextended Ġalong ĠUS Ġ2 Ġto Ġthe Ġstate Ġline Ġat ĠIron wood Ġfrom Ġits Ġwestern Ġtermin us Ġat ĠWake field Ġ. ĠA Ġsimilar Ġextension Ġwas Ġmade Ġfrom ĠM ĠâĢ ĳ Ġ28 Ġ' s Ġeastern Ġtermin us Ġto ĠS ault ĠSte Ġ. ĠMarie Ġin Ġ1948 Ġ. ĠThe ĠM ĠâĢ ĳ Ġ54 Ġdesignation Ġwas Ġren umbered Ġas ĠBusiness ĠUS Ġ2 Ġby Ġ1945 Ġ. ĠThe Ġeastern ĠM ĠâĢ ĳ Ġ28 Ġextension Ġwas Ġreversed Ġin Ġ1950 Ġ, Ġand Ġthe Ġwestern Ġextension Ġto Ġthe Ġstate Ġline Ġwas Ġshifted Ġto Ġa Ġnew Ġlocation Ġby Ġ1952 Ġ. Ġ Ġ Ġ= Ġ= Ġ= ĠInterstate Ġera Ġ= Ġ= Ġ= Ġ Ġ ĠWith Ġthe Ġcoming Ġof Ġthe ĠInterstate ĠHighway ĠSystem Ġin ĠMichigan Ġ, Ġthe ĠMS HD Ġplanned Ġto Ġconvert Ġthe Ġeastern Ġsection Ġof ĠUS Ġ2 Ġto Ġa Ġfreeway Ġbetween ĠSt . ĠIgn ace Ġand ĠS ault ĠSt . ĠMarie Ġ. ĠIn Ġplanning Ġmaps Ġfrom Ġ1947 Ġ, Ġthis Ġhighway Ġcorridor Ġwas Ġincluded Ġin Ġthe Ġsystem Ġthat Ġlater Ġbecame Ġthe ĠInter states Ġ. ĠIt Ġwas Ġalso Ġincluded Ġin Ġthe ĠGeneral ĠLocation Ġof ĠNational ĠSystem Ġof ĠInterstate ĠHigh ways ĠIncluding ĠAll ĠAdditional ĠRout es Ġat ĠUrban ĠAreas ĠDesign ated Ġin ĠSeptember Ġ1955 Ġ, Ġor ĠYellow ĠBook Ġafter Ġthe Ġcover Ġcolor Ġ, Ġthat Ġwas Ġreleased Ġin Ġ1955 Ġas Ġthe Ġfederal Ġgovernment Ġread ied Ġplans Ġfor Ġthe Ġfreeway Ġsystem Ġ. ĠThe Ġproposed Ġnumber Ġin Ġ1958 Ġwas ĠInterstate Ġ75 Ġ( ĠI ĠâĢ ĳ Ġ75 Ġ) Ġ. Ġ Ġ ĠThe Ġfirst Ġsection Ġof Ġfreeway Ġwas Ġbuilt Ġin Ġlate Ġ1957 Ġor Ġearly Ġ1958 Ġbetween ĠEver green ĠSh ores Ġand ĠM ĠâĢ ĳ Ġ123 Ġnorth Ġof ĠSt . ĠIgn ace Ġ. ĠThe ĠMack in ac ĠBridge Ġwas Ġopened Ġto Ġtraffic Ġon ĠNovember Ġ1 Ġ, Ġ1957 Ġ; Ġa Ġnew Ġsection Ġof Ġfreeway Ġand Ġan Ġinterchange Ġconnected ĠUS Ġ2 Ġto Ġthe Ġbridge Ġ. ĠIn Ġ1961 Ġ, Ġanother Ġnew Ġfreeway Ġsegment Ġclosed Ġthe Ġgap Ġbetween Ġthe ĠMack in ac ĠBridge Ġand ĠEver green ĠSh ores Ġsections Ġ. ĠAt Ġthe Ġtime Ġ, Ġthe ĠI ĠâĢ ĳ Ġ75 Ġdesignation Ġsuppl anted ĠUS Ġ27 Ġon Ġthe Ġbridge Ġ, Ġand ĠUS Ġ2 Ġwas Ġshifted Ġto Ġfollow ĠI ĠâĢ ĳ Ġ75 Ġalong Ġthe Ġfre eways Ġin Ġthe ĠSt . ĠIgn ace Ġarea Ġ. ĠThe Ġformer Ġrouting Ġof ĠUS Ġ2 Ġin Ġdowntown ĠSt . ĠIgn ace Ġwas Ġredesign ated ĠBL ĠI ĠâĢ ĳ Ġ75 Ġ. ĠMore Ġsections Ġof Ġfreeway Ġwere Ġopened Ġin Ġ1962 Ġimmediately Ġto Ġthe Ġsouth Ġof Ġthe Ġnewly Ġconstructed ĠInternational ĠBridge Ġin ĠS ault ĠSte Ġ. ĠMarie Ġas Ġwell Ġas Ġbetween ĠD after Ġand ĠKin ross Ġ. ĠThe Ġlast Ġtwo Ġsections Ġopened Ġin Ġ1963 Ġconnected Ġthe Ġnorthern Ġend Ġof Ġthe Ġfreeway Ġat ĠM ĠâĢ ĳ Ġ123 Ġto ĠKin ross Ġ, Ġand Ġthe Ġsection Ġbetween ĠD after Ġand ĠS ault ĠSte Ġ. ĠMarie Ġ. ĠAt Ġthis Ġtime Ġ, Ġall Ġof ĠUS Ġ2 Ġ' s Ġformer Ġrouting Ġbecame Ġa Ġcounty Ġroad Ġknown Ġas ĠMack in ac ĠTrail Ġ( ĠH Ġ@ - @ Ġ63 Ġ) Ġ. Ġ Ġ ĠThe ĠDepartment Ġof ĠState ĠHigh ways Ġexpanded ĠUS Ġ2 Ġ/ ĠUS Ġ41 Ġinto Ġan Ġexpress way