This project consisted of the prestressed concrete box girder approach spans of the Cochrane Bridge in Mobile. The entire approach length was 5,790 feet with a typical span length of 195 feet. The spans, originally designed as cast-in-place concrete on an erection truss, were modified to be concrete girders precast on the ground to the full span length and then lifted into position. A narrow cast-in-place joint, located near the pier, and continuity tendons provided a continuous five-span superstructure between each expansion joint. The lifting weight of each unit was about 2,400 kips. Value engineering was performed and concluded that a redesign utilizing heavy lifting of full spans precast on the ground would be more economical. T.Y. Lin International (TYLI) provided construction engineering services to the contractor.

• Kwong Cheng, current OPAC Principal, served as Project Lead Engineer while at TYLI and performed value engineering for the contractor.
• Vivian Chang, current OPAC Principal, served as Project Manager and Lead Engineer while at TYLI and performed design and analysis of the redesign, prepared shop drawings, and worked with the contractor during the construction phase.