Seven Mile Bridge
Florida Keys

At the time of its completion, Seven Mile Bridge in the Florida Keys was the longest continuous concrete segmental bridge in the world. The bridge utilizes a precast, post-tensioned box girder superstructure and hollow precast segmental piers, which increased the speed of erection. This was the first use in America of precast, match-cast box piers, which were assembled with vertical post-tensioning. The entire structure was completed six months ahead of schedule. Additionally, the design saved the owner $7 million in alternate bidding.