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I-74 Mississippi River Bridge historical


The I-74 Mississippi River Bridge historically has provided an important east-west link in the nation's transportation network. The I-74 bridge crosses the Mississippi River on two separate structures. The westbound bridge, Illinois to Iowa, was completed and opened in 1935. The eastbound bridge, Iowa to Illinois, was completed in 1959 and opened in 1960.

Planning and Design | Planning a bridge for the future

In 2016, traffic on the I-74 bridges across the Mississippi River exceeded a 74,000 average daily traffic count. It is estimated that traffic volumes will rise to approximately 99,900 vehicles per day by 2035, according to traffic projections endorsed by the Bi-State Regional Commission. Growing population and employment during the past several decades have led to increased traffic volume. The Iowa and Illinois departments of transportation joined forces with other agencies and local officials to conduct the I-74 Iowa-Illinois Corridor Study.

This study evaluated transportation issues and recommended solutions to improve traffic flow and complement community goals and plans, with respect to the environment. A solution for the I-74 corridor was achieved by working collectively and communicating with concerned parties. The Iowa Department of Transportation, Illinois Department of Transportation and the Federal Highway Administration worked closely with a committee composed of transportation and community officials throughout the development of the project. In addition, the Bi-State Regional Commission, the Metropolitan Planning Organization for the Quad Cities area, adopted the project as their top transportation priority and included it in its long-range transportation plan. Communication with all interested parties was maintained through a series of public hearings to present the findings in the Draft Environmental Impact Statement and Final Environmental Impact Statement. The Record of Decision which gave the project federal approval to proceed, was signed in 2009.

View the environmental documents from the I-74 Iowa-Illinois Corridor Study.

Construction | Building a bridge for the future

Construction of the local road improvements are ongoing, while construction of the bridges and interchanges are anticipated to take place over 3½ years. The bridge construction, along with the bridge approaches, on the Iowa side (City of Bettendorf) is anticipated to begin in July 2017.

I-74 Bridge arches present day