Treasure Island Bascule Bridge Replacement

Completed in 2007, the Treasure Island Bascule Bridge Replacement project consisted of the construction of major bascule bridge/causeway and state-of-the-art control house. This water crossing bridge in Treasure Island, Florida involved construction of new dual twin leaf bascule bridge with new control house, hydraulically lifted bascule spans, state of the art control system, architectural designs throughout the approach and main channel spans, pre-stressed concrete piling, cofferdam construction, post tensioned precast deck slabs, fender systems and multi-phased bridge and roadwork. All of the bridge construction was done off of barges. The marine navigation channel remained open during the entire duration of the project except for safety precautions during short term closures for bascule span erection and controlled blasting during demolition of the existing bascule piers. To minimize disruption to marine traffic during bascule span erection, the bascule span heal sections and counterweights were erected in-place on temporary heavy duty shoring. The bascule span toe sections were then pre-assembled on a barge, hoisted into place with two barge mounted cranes and final connection made to the heal sections utilizing a field splice connection. Close coordination and communication with the Coast Guard and other local stakeholders was maintained throughout the life of the project.
Treasure Island’s original causeway bascule bridge was built in 1939 and operated as a toll bridge for 76 years. Southland was selected for the marine job and all construction was performed from the water utilizing barges and flexi floats. The Treasure Island Causeway is noted for it’s attractive art deco design. The operation of the drawbridge is computerized and controlled by a touch screen monitor.
Won the FTBA/FDOT Major Bridge award for Best in Construction 2007, also was ranked # 7 by Roads and Bridges Magazine’s Top 10 Bridges for 2007.