route iowa highway shortest highway state iowa crosses iowa nebraska runs approximately tenths mile interchange interstate road continues north parkway like state highways iowa route maintained long route iowa extended state traveled miles crossing built late 1950s moved new interstate highway historic ends highway iowa bridge failures caused mid-1980s national end highway moved interchange route description iowa begins veterans memorial bridge heads north parkway comes interchange interstate business iowa highway iowa interchange iowa unsigned highway east interchange route signed west duplicate route parkway briefly overlaps ends center interchange entire route long miles shortest highway state second shortest state highway overall located miles southeast shortest state highway miles length instance highway crosses nebraska ends history long route iowa extended iowa overlapping combination bridge perry street turned east 5th street turned west block north riverside avenue known 4th street followed riverside west section near confluence missouri rivers route curved north banks turned west military road crossed river shortly route longest extent miles portion route west replaced section primary road followed route parallel carried east combination bridge extended westward banks connected riverside avenue near river confluence moved new road removed section riverside late 1950s construction began route planned banks missouri river generally following path section point gordon drive east combination bridge opened october moved new interstate combination bridge interchange sections opened allowing traffic utilize bridges crossing built moved interstate completely arrangement long april flood waters brought northbound bridge river investigation collapse found waters dirt rocks away bridge piers caused fail directions traffic routed old alignment bridges repaired faced bridge problems end steel tied arch bridge built replace combination bridge opened veterans memorial bridge opened traffic january dedicated months later july long routine bridge washing iowa dot worker discovered inch long crack box crack approximately inch wide told workers time bridge immediately closed repairs traffic rerouted south cross missouri bridge bridge fully opened couple years truncated interchange completion interstate generally followed northward meant end importance maps published traffic logs list extending highway maps traffic logs ending meaning route shortened time years major intersections
U.S. Route 77 in Iowa