on november 11, 1926, members of american association of state highway officials approved plan create system of interstate highways across country. iowa s whiteway highway take on designation of us 32. four-and-a-half years, us 32 spanned chicago council bluffs. meanwhile, roosevelt highway association pushing have us 6 extended westward. on june 8, 1931, of iowa portion of us 32 absorbed newly extended us 6, had connected erie, pennsylvania, , cape cod. new us 6 replaced us 38 in nebraska , colorado. end of 1937, us 6 extended coast coast. @ time, , us 30 cross country highways bear single route number across country.
when last segment of highway between adel , des moines paved in 1931, us 6 became fourth paved road cross state. in 1940s, us 6 heavily traveled route in state. state highway commission recorded on average, on 1900 vehicles used road per day @ rural point. compares 3000 vehicles using us 6 daily in 2012.
on april 29, 1947, iowa general assembly approved act designating us 6 grand army of republic highway, distinction route shares in other states. governor robert d. blue dedicated g.a.r. highway @ old capitol on september 28, 1947. in attendance last 2 surviving iowa veterans of civil war. in 1950s, iowa state highway commission began straighten route. section of highway between grinnell , ladora straightened, resulted in brooklyn , victor being bypassed. between dexter , west des moines, us 6 swapped alignments iowa 90 in 1958. in 1961, us 6 routed onto new interstate 80 iowa 90 interchange baxter exit, exit 159. iowa 90 extended onto old us 6 alignment. however, in 1967, changes reversed , us 6 taken off i-80 , put on road had been iowa 90. iowa 90 assigned section of us 6 between s exit 106 along i-80 , exit 69 along i-35.
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