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LA 400 Bridge over Cancienne Canal


The Department of Transportation and Development requested proposals to replace a narrow, 2-lane bridge in Assumption Parish in order to improve the parish's transportation infrastructure. Built in the 1950s, the 6-span, timber bridge crosses Cancienne Canal on LA Highway 400, about six miles west of LA Highway 1.


The narrow 2-lane bridge will be replaced with a 24' clear width structure to provide two 12' lanes and 2' shoulders. The structure's length is 120' and includes six 20' spans which will either be cast-in-place or precast elements. Special guardrail sections were utilized at the begin bridge side to accommodate local business drives and access. Extensive maintenance of traffic plans were created for this project as the bridge's replacement required a closure of the roadway and detours to other routes. T. Baker Smith (TBS) was responsible for coordinating these detours with Assumption Parish.


  • Louisiana Department of Transportation and Development
  • Assumption Parish
  • U.S. Army Corps of Engineers


  • Topographic and environmental surveys
  • Wetland delineation report
  • Permit acquisition
  • Hydraulic report
  • Right-of-way mapping
  • Utility relocation
  • Preliminary and final plans


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