 Until 1973 , the section in Iowa between the current eastern end and I @-@ 29 was designated as Interstate 80N . I @-@ 680 in Omaha was originally designated Interstate 280 . Maps from the early and mid @-@ 1960s showed I @-@ 280 in Omaha . Since this highway would extend into Iowa , and I @-@ 280 was already planned for the Quad Cities area , this route was redesignated I @-@ 680 . 
