The Lake Ponchartrain Causeway, measuring 23.87 miles between abutments was built as the longest continuous overwater highway bridge in the world. Providing twin 28-foot roadways with bascules, the bridge consists of equal spans of pretensioned precast concrete. The spans are supported on pile bents with precast concrete caps and hollow, centrifugally cast, post-tensioned concrete cylinder piles.
Volkert’s design won the 1969 AISC (American Institute of Steel Construction Prize Bridge Award) in the movable span category. The firm’s responsibilities consisted of feasibility studies, preliminary and final designs, and construction inspection services.