Modjeski and Masters Selected to Study New Mississippi River Bridge at Quincy

Modjeski and Masters was selected to study a new Mississippi River Bridge near Quincy Illinois to alleviate traffic on the existing Quincy Memorial Bridge. Alternative designs were developed for segmental concrete and steel cable-stayed bridge alternatives. We also provided engineering services related to aerodynamic testing of both superstructure alternatives. Shown here is the rendering of the cable-stayed alternative which was eventually selected.

Construction Commences on New Quincy Bayview Cable-Stayed Bridge

Construction started on the new Quincy Bayview Bridge in late 1984. Shown here is construction progress on one of the 270-foot high bridge towers as of 1985.

Construction on the New Quincy Bayview Cable-Stayed Bridge is Nearly Complete

Construction was proceeding nicely in 1986. Shown here is the nearly completed superstructure as shown looking down from one of the bridge towers. Work would continue into the next year.

The New Quincy Bayview Bridge Opens to Traffic

The new Quincy Bayview Bridge was completed and opened to traffic on August 22, 1987. The bridge was the first cable-stayed bridge of its kind in the U.S. – a hybrid, or composite, design. It was the first to combine cables, structural welded steel I-girders, and precast, post-tensioned concrete deck panels.

Modjeski and Masters Performs Ongoing Maintenance and Repair

Modjeski and Masters has performed numerous maintenance and repair projects for the Quincy Bayview Bridge. One of the most significant projects was an in-depth cable inspection project that was completed in 2014. The first part of the cable investigation project included an in-depth inspection of the stay cables and anchorages The second part included a structural evaluation of the stay cables and anchorages; determining repair methods; life cycle cost analyses for all repair options; recommendations for future repairs and monitoring; and developing a summary report.

Our innovative engineering measures include the use of technical access inspection methods to provide a “hands-on” visual inspection of each cable with minimal traffic interruptions.  This results in a substantial savings of cost and time.