 In December 2012 , the National Park Service approved the listing of the Upper Twin Falls Bridge that crosses the Menominee River northwest of Iron Mountain . The structure is a single @-@ span , pin @-@ connected , camelback , through @-@ truss bridge , and it is the only known example of its type in Michigan . It was built between 1909 and 1910 because the Twin Falls Power Dam would flood an existing river crossing . The span cost $ 5 @,@ 106 ( equivalent to $ 780 @,@ 000 in 2015 ) , paid equally by Dickinson and Florence counties . Until the 1930s , the Upper Twin Falls Bridge carried US 2 across the Menominee River . In 1934 , a new bridge was built about a mile downstream , and the highway was rerouted over the new span . The bridge closed to automobile traffic in September 1971 , and the nomination process for inclusion on the National Register of Historic Places began in 2012 .   In 2003 , MDOT replaced the Sturgeon River Bridge in Waucedah Township , Dickinson County . As of October 2011 , even though the old bridge was demolished and replaced , MDOT retained it on their historic bridge list . It was built in 1929 .   Before 1983 , US 2 used a different routing through Manistique and crossed the Manistique River on what is nicknamed the " Siphon Bridge " . Built as a part of a raceway flume on the river , the water level is actually higher than the road surface . This produces a siphon effect , giving the bridge its nickname . The Manistique Pulp and Paper Company was organized in 1916 and needed a dam on the Manistique River to supply their mill . This dam would require a large section of the city to be flooded , and shallow river banks meant difficulties in any bridge construction . Instead of expensive dikes , a concrete tank was built lengthwise in the river bed ; the sides of this tank provided man @-@ made banks higher than the natural banks . The Michigan Works Progress Administration described the bridge as having " concrete bulkheads , formed by the side spans of the bridge , [ that ] allow the mill to maintain the water level several feet above the roadbed . " The Manistique Tourism Council stated : " At one time , the bridge itself was partially supported by the water that was atmospherically forced under it , " and that the bridge has been featured in Ripley 's Believe It or Not ! . The eight @-@ span structure is 294 feet ( 90 m ) long .   The Cut River Bridge carries US 2 across the Cut River in Hendricks Township , Mackinac County . This structure was built during World War II but completion was delayed due to war @-@ induced steel shortages . The span uses 888 short tons ( 793 long tons ; 806 t ) of structural steel to bridge the 641 feet ( 195 m ) over the river and its gorge at a height of 147 feet ( 45 m ) above the river . The Cut River Bridge is one of only two cantilevered deck truss bridges in the state . On either side of the bridge , there are picnic areas and trails down to the river .   Listed on the NRHP on December 17 , 1999 , the Mackinac Trail – Carp River Bridge carries H @-@ 63 , the modern successor to US 2 , over the Carp River north of St. Ignace . The bridge is another spandrel arch structure 60 feet ( 18 m ) in length and built in 1920 . Increasing traffic along Mackinac Trail prompted the MSHD to " widen its deck by five feet [ 1 @.@ 5 m ] and install new guardrails in the 1929 – 1930 biennium " along with the addition of decorative retaining walls .   The last of the historic bridges along a former segment of US 2 is the structure carrying Ashmun Street ( BS I ‑ 75 ) over the Power Canal in Sault Ste . Marie . Built in 1934 , it is one of only three steel arch bridges in the state . The 42 @-@ foot @-@ wide ( 13 m ) and 257 @-@ foot @-@ long ( 78 m ) structure is described by MDOT as " massive " with an " innovative " construction method : the previous structure was used as a falsework for the current bridge before removal .   = = Major intersections = =   MDOT has erected milemarkers along the two Michigan segments of the highway that use the total mileage starting at the state line in Ironwood ; the signs on the eastern segment reflect the mileage in Florence County , Wisconsin .   = = Business route = =   Business U.S. Highway 2 ( Bus . US 2 ) is a 1 @.@ 270 @-@ mile ( 2 @.@ 044 km ) business route that runs from the Wisconsin state line at the Montreal River . The route extends through downtown Ironwood on Silver and Aurora streets before turning northward along Suffolk Street . Bus . US
ĠIn ĠDecember Ġ2012 Ġ, Ġthe ĠNational ĠPark ĠService Ġapproved Ġthe Ġlisting Ġof Ġthe ĠUpper ĠTwin ĠFalls ĠBridge Ġthat Ġcrosses Ġthe ĠMen om ine e ĠRiver Ġnorthwest Ġof ĠIron ĠMountain Ġ. ĠThe Ġstructure Ġis Ġa Ġsingle Ġ@ - @ Ġspan Ġ, Ġpin Ġ@ - @ Ġconnected Ġ, Ġcamel back Ġ, Ġthrough Ġ@ - @ Ġtr uss Ġbridge Ġ, Ġand Ġit Ġis Ġthe Ġonly Ġknown Ġexample Ġof Ġits Ġtype Ġin ĠMichigan Ġ. ĠIt Ġwas Ġbuilt Ġbetween Ġ1909 Ġand Ġ1910 Ġbecause Ġthe ĠTwin ĠFalls ĠPower ĠDam Ġwould Ġflood Ġan Ġexisting Ġriver Ġcrossing Ġ. ĠThe Ġspan Ġcost Ġ$ Ġ5 Ġ@ , @ Ġ106 Ġ( Ġequivalent Ġto Ġ$ Ġ780 Ġ@ , @ Ġ000 Ġin Ġ2015 Ġ) Ġ, Ġpaid Ġequally Ġby ĠDickinson Ġand ĠFlorence Ġcounties Ġ. ĠUntil Ġthe Ġ1930 s Ġ, Ġthe ĠUpper ĠTwin ĠFalls ĠBridge Ġcarried ĠUS Ġ2 Ġacross Ġthe ĠMen om ine e ĠRiver Ġ. ĠIn Ġ1934 Ġ, Ġa Ġnew Ġbridge Ġwas Ġbuilt Ġabout Ġa Ġmile Ġdownstream Ġ, Ġand Ġthe Ġhighway Ġwas Ġre r outed Ġover Ġthe Ġnew Ġspan Ġ. ĠThe Ġbridge Ġclosed Ġto Ġautomobile Ġtraffic Ġin ĠSeptember Ġ1971 Ġ, Ġand Ġthe Ġnomination Ġprocess Ġfor Ġinclusion Ġon Ġthe ĠNational ĠRegister Ġof ĠHistoric ĠPlaces Ġbegan Ġin Ġ2012 Ġ. Ġ Ġ ĠIn Ġ2003 Ġ, ĠMD OT Ġreplaced Ġthe ĠSturgeon ĠRiver ĠBridge Ġin ĠW au ced ah ĠTownship Ġ, ĠDickinson ĠCounty Ġ. ĠAs Ġof ĠOctober Ġ2011 Ġ, Ġeven Ġthough Ġthe Ġold Ġbridge Ġwas Ġdemolished Ġand Ġreplaced Ġ, ĠMD OT Ġretained Ġit Ġon Ġtheir Ġhistoric Ġbridge Ġlist Ġ. ĠIt Ġwas Ġbuilt Ġin Ġ1929 Ġ. Ġ Ġ ĠBefore Ġ1983 Ġ, ĠUS Ġ2 Ġused Ġa Ġdifferent Ġrouting Ġthrough ĠMan ist ique Ġand Ġcrossed Ġthe ĠMan ist ique ĠRiver Ġon Ġwhat Ġis Ġnicknamed Ġthe Ġ" ĠS iph on ĠBridge Ġ" Ġ. ĠBuilt Ġas Ġa Ġpart Ġof Ġa Ġrac eway Ġfl ume Ġon Ġthe Ġriver Ġ, Ġthe Ġwater Ġlevel Ġis Ġactually Ġhigher Ġthan Ġthe Ġroad Ġsurface Ġ. ĠThis Ġproduces Ġa Ġsiph on Ġeffect Ġ, Ġgiving Ġthe Ġbridge Ġits Ġnickname Ġ. ĠThe ĠMan ist ique ĠPul p Ġand ĠPaper ĠCompany Ġwas Ġorganized Ġin Ġ1916 Ġand Ġneeded Ġa Ġdam Ġon Ġthe ĠMan ist ique ĠRiver Ġto Ġsupply Ġtheir Ġmill Ġ. ĠThis Ġdam Ġwould Ġrequire Ġa Ġlarge Ġsection Ġof Ġthe Ġcity Ġto Ġbe Ġflooded Ġ, Ġand Ġshallow Ġriver Ġbanks Ġmeant Ġdifficulties Ġin Ġany Ġbridge Ġconstruction Ġ. ĠInstead Ġof Ġexpensive Ġd ikes Ġ, Ġa Ġconcrete Ġtank Ġwas Ġbuilt Ġlength wise Ġin Ġthe Ġriver Ġbed Ġ; Ġthe Ġsides Ġof Ġthis Ġtank Ġprovided Ġman Ġ@ - @ Ġmade Ġbanks Ġhigher Ġthan Ġthe Ġnatural Ġbanks Ġ. ĠThe ĠMichigan ĠWorks ĠProgress ĠAdministration Ġdescribed Ġthe Ġbridge Ġas Ġhaving Ġ" Ġconcrete Ġbulk heads Ġ, Ġformed Ġby Ġthe Ġside Ġspans Ġof Ġthe Ġbridge Ġ, Ġ[ Ġthat Ġ] Ġallow Ġthe Ġmill Ġto Ġmaintain Ġthe Ġwater Ġlevel Ġseveral Ġfeet Ġabove Ġthe Ġroad bed Ġ. Ġ" ĠThe ĠMan ist ique ĠTourism ĠCouncil Ġstated Ġ: Ġ" ĠAt Ġone Ġtime Ġ, Ġthe Ġbridge Ġitself Ġwas Ġpartially Ġsupported Ġby Ġthe Ġwater Ġthat Ġwas Ġatmosp her ically Ġforced Ġunder Ġit Ġ, Ġ" Ġand Ġthat Ġthe Ġbridge Ġhas Ġbeen Ġfeatured Ġin ĠRip ley Ġ' s ĠBelieve ĠIt Ġor ĠNot Ġ! Ġ. ĠThe Ġeight Ġ@ - @ Ġspan Ġstructure Ġis Ġ294 Ġfeet Ġ( Ġ90 Ġm Ġ) Ġlong Ġ. Ġ Ġ ĠThe ĠCut ĠRiver ĠBridge Ġcarries ĠUS Ġ2 Ġacross Ġthe ĠCut ĠRiver Ġin ĠHendricks ĠTownship Ġ, ĠMack in ac ĠCounty Ġ. ĠThis Ġstructure Ġwas Ġbuilt Ġduring ĠWorld ĠWar ĠII Ġbut Ġcompletion Ġwas Ġdelayed Ġdue Ġto Ġwar Ġ@ - @ Ġinduced Ġsteel Ġshortages Ġ. ĠThe Ġspan Ġuses Ġ8 88 Ġshort Ġtons Ġ( Ġ7 93 Ġlong Ġtons Ġ; Ġ8 06 Ġt Ġ) Ġof Ġstructural Ġsteel Ġto Ġbridge Ġthe Ġ6 41 Ġfeet Ġ( Ġ195 Ġm Ġ) Ġover Ġthe Ġriver Ġand Ġits Ġgorge Ġat Ġa Ġheight Ġof Ġ147 Ġfeet Ġ( Ġ45 Ġm Ġ) Ġabove Ġthe Ġriver Ġ. ĠThe ĠCut ĠRiver ĠBridge Ġis Ġone Ġof Ġonly Ġtwo Ġcant ile vered Ġdeck Ġtr uss Ġbridges Ġin Ġthe Ġstate Ġ. ĠOn Ġeither Ġside Ġof Ġthe Ġbridge Ġ, Ġthere Ġare Ġpicnic Ġareas Ġand Ġtrails Ġdown Ġto Ġthe Ġriver Ġ. Ġ Ġ ĠL isted Ġon Ġthe ĠNR HP Ġon ĠDecember Ġ17 Ġ, Ġ1999 Ġ, Ġthe ĠMack in ac ĠTrail ĠâĢĵ ĠCar p ĠRiver ĠBridge Ġcarries ĠH Ġ@ - @ Ġ63 Ġ, Ġthe Ġmodern Ġsuccessor Ġto ĠUS Ġ2 Ġ, Ġover Ġthe ĠCar p ĠRiver Ġnorth Ġof ĠSt . ĠIgn ace Ġ. ĠThe Ġbridge Ġis Ġanother Ġsp and rel Ġarch Ġstructure Ġ60 Ġfeet Ġ( Ġ18 Ġm Ġ) Ġin Ġlength Ġand Ġbuilt Ġin Ġ1920 Ġ. ĠIncreasing Ġtraffic Ġalong ĠMack in ac ĠTrail Ġprompted Ġthe ĠMS HD Ġto Ġ" Ġwiden Ġits Ġdeck Ġby Ġfive Ġfeet Ġ[ Ġ1 Ġ@ . @ Ġ5 Ġm Ġ] Ġand Ġinstall Ġnew Ġguard ra ils Ġin Ġthe Ġ1929 ĠâĢĵ Ġ1930 Ġbi enn ium Ġ" Ġalong Ġwith Ġthe Ġaddition Ġof Ġdecorative Ġretaining Ġwalls Ġ. Ġ Ġ ĠThe Ġlast Ġof Ġthe Ġhistoric Ġbridges Ġalong Ġa Ġformer Ġsegment Ġof ĠUS Ġ2 Ġis Ġthe Ġstructure Ġcarrying ĠAsh mun ĠStreet Ġ( ĠBS ĠI ĠâĢ ĳ Ġ75 Ġ) Ġover Ġthe ĠPower ĠCanal Ġin ĠS ault ĠSte Ġ. ĠMarie Ġ. ĠBuilt Ġin Ġ1934 Ġ, Ġit Ġis Ġone Ġof Ġonly Ġthree Ġsteel Ġarch Ġbridges Ġin Ġthe Ġstate Ġ. ĠThe Ġ42 Ġ@ - @ Ġfoot Ġ@ - @ Ġwide Ġ( Ġ13 Ġm Ġ) Ġand Ġ257 Ġ@ - @ Ġfoot Ġ@ - @ Ġlong Ġ( Ġ78 Ġm Ġ) Ġstructure Ġis Ġdescribed Ġby ĠMD OT Ġas Ġ" Ġmassive Ġ" Ġwith Ġan Ġ" Ġinnovative Ġ" Ġconstruction Ġmethod Ġ: Ġthe Ġprevious Ġstructure Ġwas Ġused Ġas Ġa Ġfalse work Ġfor Ġthe Ġcurrent Ġbridge Ġbefore Ġremoval Ġ. Ġ Ġ Ġ= Ġ= ĠMajor Ġintersections Ġ= Ġ= Ġ Ġ ĠMD OT Ġhas Ġerected Ġmile mark ers Ġalong Ġthe Ġtwo ĠMichigan Ġsegments Ġof Ġthe Ġhighway Ġthat Ġuse Ġthe Ġtotal Ġmileage Ġstarting Ġat Ġthe Ġstate Ġline Ġin ĠIron wood Ġ; Ġthe Ġsigns Ġon Ġthe Ġeastern Ġsegment Ġreflect Ġthe Ġmileage Ġin ĠFlorence ĠCounty Ġ, ĠWisconsin Ġ. Ġ Ġ Ġ= Ġ= ĠBusiness Ġroute Ġ= Ġ= Ġ Ġ ĠBusiness ĠU . S . ĠHighway Ġ2 Ġ( ĠBus Ġ. ĠUS Ġ2 Ġ) Ġis Ġa Ġ1 Ġ@ . @ Ġ270 Ġ@ - @ Ġmile Ġ( Ġ2 Ġ@ . @ Ġ0 44 Ġkm Ġ) Ġbusiness Ġroute Ġthat Ġruns Ġfrom Ġthe ĠWisconsin Ġstate Ġline Ġat Ġthe ĠMontreal ĠRiver Ġ. ĠThe Ġroute Ġextends Ġthrough Ġdowntown ĠIron wood Ġon ĠSilver Ġand ĠAurora Ġstreets Ġbefore Ġturning Ġnorth ward Ġalong ĠSuffolk ĠStreet Ġ. ĠBus Ġ. ĠUS