Big Bayou Sara Bridge is an historic bridge (built in 1949) carrying LA-66 over Big Bayou Sara in West Feliciana Parish, Louisiana. The bridge main spans comprises five, 100 ft. steel pony trusses and the approach spans comprises five, 40 ft. steel I-beam spans with a total bridge length of 700 ft.

Services provided by SDR included in-depth inspection of the superstructure and substructure of the bridge, development of 3-D finite element models to determine internal forces, evaluation of the existing structure to determine deficient elements, design of a rehabilitation system for the superstructure and substructure, development of preliminary and final plans for construction, design of two-lane detour temporary steel bridge to be constructed on the north side of the existing bridge to maintain traffic during rehabilitation work on the existing bridge, development of cost estimation and schedule, and construction support.

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