Jane Byrne Interchange
The Jane Byrne (formerly Circle) Interchange functions as the hub of the Chicago expressway system and was built in the early 1960s. It has been rated one of the most congested highway freight bottlenecks in the nation based on a study completed by the American Transportation Research Institute and FHWA. Many of the bridges are structurally and functionally obsolete and need to be reconstructed. The interchange accommodates more than 400,000 vehicles a day, of which 33,000 are trucks. As part of a joint-venture team, TranSystems delivered the planning and design for the interchange, which impacted 22 existing bridges ranging from two spans to multi-span curved ramps.
The largest bridge is a new tri-level northbound to westbound flyover structure. It is over 2,000-feet long, consisting of 13 spans of curved steel and flared girders. It spans over major interstates, existing and future CTA transit tunnels, abandoned and active water tunnels, and several major utilities. The Peoria Street bridge also is unique because it is the first precast deck bridge with UHPC joints in Illinois. The project also includes over 50 retaining walls, ranging from conventional concrete walls to secant types. The tight geometry of the interchange, location of the project, and large traffic volumes along with an aggressive schedule makes this a complex and important project for Chicago.