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John's Pass Bridge

The John's Pass Bridge connects Treasure Island with Madeira Beach along Florida’s west coast. The bridge underwent two major repairs over the past two decades, and has now been replaced after 35 years of service.


John's Pass Bridge

WSP USA provided environmental, preliminary engineering and design services for the new bascule bridge, which carries Gulf Boulevard (SR 699) over the Intra-Coastal Waterway in Pinellas County, Florida. The firm also provided construction engineering and inspection services.

The John's Pass Bridge provides access to the Gulf of Mexico for substantial marine traffic. Gulf Boulevard is a busy arterial roadway and the existing bascule bridge was a bottleneck for vehicular traffic. In addition, the foundations of the existing twin double-leaf bascule bridges were undermined from scour caused by swift tidal currents. 

The new bridge is an 875-foot-long, four-leaf bascule (twin parallel bridges) over a swift moving channel. It features a 27-foot clearance over the channel; a horizontal navigational clearance increased from 60 to 100 feet; 8-foot sidewalks; 10-foot outside shoulders; and 4-foot inside shoulders. The design team had to overcome numerous technical issues to improve constructibility and accommodate special site conditions. A steel box girder superstructure was chosen to combine enhanced aesthetics with increased torsional rigidity. The $77 million bridge fully opened to vehicles, pedestrians, and bicyclists in September 2010. The dedication ceremony took place on December 11, 2010.