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S.R. 706, Indiantown Road Bridge over the Intracoastal Waterway, Jupiter, Florida: E.C. Driver designed a pair of 1,344 foot long bridges featuring prestressed AASHTO girder approaches and a single leaf trunnion type bascule main span. The bridges cross the 90-foot wide navigation channel at an 18° skew resulting in length of 123 feet from the trunnion to the tip of the leaf. In addition to the bridges, the project also included widening 1.5 miles of two lane undivided roadway into a six lane divided highway. Significant storm sewer improvements were required as well as utility relocations including three directional bore crossings of the Intracoastal Waterway. One of the most challenging aspects of the roadway design was to provide higher approach grades to tie into the new mid-level bascule bridges. The work was complicated because of extremely tight right-of-way constraints. As a result of the higher grades and longer approaches, the intersection of SR 706 with SR 5 was reconstructed at an average grade up to five feet higher than the existing grade. This required the design of innovative traffic control plans.
Client: Florida DOT, District Four
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