The purrpose of the LA 1088 Corridor Study is to reduce existing congestion and accommodate future traffic demands along 3.5 miles of the LA 1088 corridor from LA 59 to I-12.
DOTD is in the final stages of the Environmental Assessment document and a link will be provided to the document once it is approved. Excerpts from the document are provided below.
Improvements to the corridor will be broken into the 5 following phases:
1. Roundabouts at Soult St. and Trinity Dr.
2. Roundabout at Forest Brook Blvd. and required roadway widening
3. Roundabouts at I-12 Intersections
4. Roadway widening from I-12 to Forest Brook Blvd.
5. Roundabouts at LA 59, Jackson St., and Spring. Blvd.
The current cost for all phases is estimated to be $36,500,000. This estimate includes right-of-way acquisition, utility relocations, environmental mitigation, engineering, and construction.
Draft Environmental Assessment
The environmental assessment was completed in May 2021 and re-evaluated in August 2026. Design started on Phase1: H.010116 LA 1088 Soult and Trinity Roundabouts in September 2022 and on Phase 2: H.012633 LA 1088 Trinity to Oak St - AM Phase 2 in November 2023. A Public Meeting was held on December 8, 2025 to present the design for Phase 1 and the proposed changes to Phase 2. Comments were received from the public and comments and responses can be viewed in the Public Meeting Record below. St Tammany Parish is currently constructing a new roundabout at LA 1088 and the Mandeville Bypass that will work in coordination with the DOTD LA 1088 corridor improvements.
Catherine Mastin
Senior Project Manager
225-379-1652
[email protected]