Interstate 74 bridges Bettendorf, IA, and Moline, IL, over the Mississippi River. The original bridge was built in June 1934, with construction starting on a twin bridge in July 1958. The original spans, designed by Ralph Modjeski, merged in 1975. And by 1994, vehicle traffic had doubled, prompting the Illinois (IL) DOT to appropriate millions of dollars for a new bridge design.
Massive River-Crossing Arches Complete New I-74 Mississippi River Bridge