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

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.