Client: LaDOTD - Louisiana, Statewide
Completion Date:
Scope of Services
Bridge Optimization Study
Traffic Study
Final Plans, Specifications, and Estimate of Probable Construction Cost
Shop Drawing Review
GEC was selected as subcontractor to HNTB to provide complete design and plan preparation for the approaches to the movable (bascule) center span of the Intracoastal Waterway Bridge at Louisa, Louisiana. Thirty-eight spans of five AASHTO BT-72 prestressed concrete girders, each stretching 121.4 feet (37 meters), carry the 37.4 foot (11.4 meter) cast-in-place roadway deck to the high-level bascule. Eighteen two-column bents with doubly tapered columns achieve an ultimate deck elevation of over 90 feet (27.4 meters), supported by deep pile footings. Eighteen pile bents, each formed from five 30 inch (750 mm) square piles, support the lower spans. A pile-supported approach slab at each end of the bridge helps transition to the roadway in difficult soil conditions. A bridge Optimization Study performed by GEC was the basis for span lengths and foundation selection. GEC also provided construction engineering support for the approaches during construction.
