St Ann Bridge over Bayou Terrebonne

Location: Terrebonne Parish     
Date Completed: 2014

Huval & Associates, Inc. was contracted to provide all necessary engineering and land surveying services required for developing plans for the replacement of the St. Ann Bridge.
Huval’s responsibilities included the engineering design and construction plans to the 90′ steel girder swing span and approaches.

The bridge structure had to be designed in a tight area under vertical constraints to minimize impact to the surrounding roadways and water levels. The Huval team also performed the mechanical, hydraulic and electrical design for the movable bridge crossing

The project is being performed by Huval with assistance of a sub-consultant and includes roadway and roadway drainage design.

Responsible for preparation of the Final Plans for Supplement No. 2, and presently working on Supplement No. 3, that includes Construction Engineering Services for the removal of the existing bridge and construction of a new movable bridge on the existing alignment.

This project is ongoing.


Challenges Encountered

    •  Tight area under vertical constraints
    •  Construction of new bridge on the existing alignment

Solutions Provided

    • Unique design of compact pivot beams as well as compact design of center bearing has allowed the Huval team to “fit” the bridge in the very tight space available
    • Construction phasing has been provided that allows the existing bridge to remain in service for both the vehicular and boat traffic during the majority of the construction



– New bridge design, movable bridge construction support, movable bridge design.


– Drainage design.


– Construction means & methods.


At Huval & Associates, we believe that our people are our future. We are always on the lookout for employees who share our passion, innovation and commitment to providing clients with expert design and engineering services. Interested parties should forward a CV with the form below for consideration.