Belle Chasse Bridge Tunnel

Stage 1 Environmental Assessments for the Belle Chasse Tunnel and Bridge Replacement

  • ClientNew Orleans Regional Planning Commission
  • LocationPlaquemines Parish, LA
  • Cost$119k

Key Services:

  • Site Assessment
  • Feasibility Studies
  • Environmental Assessment
  • Environmental Permitting and Compliance
  • Engineering & Design
  • Utility Relocations

This project included the preparation of a Stage 1 Environmental Assessment (EA) and other related documents for the replacement of the existing Belle Chasse tunnel and bridge with a new four-lane bridge facility. The alternatives include one fixed high-level bridge and two movable bridges, each with a different clearance from the bottom of the bridge to the mean high tide level in the Gulf Intracoastal Waterway (GIWW). In addition, the EA considered the No Build Alternative. The Stage 1 Environmental Assessment was conducted in accordance with National Environmental Policy Act (NEPA) and Federal Highway Administration (FHWA) regulations and guidelines.

Trigon’s primary responsibilities included environmental site assessment oversight/QA, traffic counts/study, development of typical sections, right-of-way and utilities assessment, and construction maintenance of traffic plans.


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Trigon Associates
1515 Poydras Street, Suite 930
New Orleans, Louisiana 70112
P: (504) 585-5767
F: (504) 585-5747
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