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Interstate 405 from Wilmington Avenue to Main Street Improvements Project (EA 35940)

Location and Limits

The project is located on Interstate 405 (I-405) from Wilmington Avenue (postmile [PM] 9.6) to Main Street (PM 12.6) in the City of Carson, Los Angeles County, California.

 

The Project

Caltrans and Metro are proposing the I-405 from Wilmington Avenue to Main Street Improvements Project that would add auxiliary lanes between on- and off-ramps between PM 9.6 and PM 12.6 to improve weaving, merging, and diverging operations. The project would also implement Complete Streets elements and Transportation System Management (TSM) and Transportation Demand Management (TDM) systems.

 

The purpose of the project is to provide improved connectivity and increase multimodal access within the project corridor and to accommodate the planned economic development within the project study area. The need of the project is to improve traffic operations and safety for vehicle traffic and to provide additional access and connectivity for pedestrians and bicyclists at local interchanges throughout the project corridor.

 

Three alternatives are being evaluated as part of the project: one No-Build Alternative (Alternative 1) and two Build Alternatives (Alternatives 2 and 3).

 

·      Alternative 1 is the No-Build Alternative.

·      Alternative 2 proposes to add one auxiliary lane on both the northbound (NB) and southbound (SB) I-405 mainline from the Wilmington Avenue interchange and the Carson Street interchange to the Avalon Boulevard interchange. Additionally, Alternative 2 would implement Complete Streets elements as well as TSM/TDM systems throughout the project study area.

·      Alternative 3 proposes to implement Complete Streets elements as well as TSM/TDM systems throughout the project study area.

 

Caltrans is the lead agency under the California Environmental Quality Act (CEQA) and the National Environmental Policy Act (NEPA).

 

Benefits

The project Build Alternatives would provide improvements to facilitate an integrated approach for all modes of transportation to enhance mobility, accessibility, and connectivity in a Complete Streets environment for all communities along the existing corridor.

 

Environmental Document

The Draft Environmental Document will be circulated summer 2026 and may be accessed on LA Metro’s site here: https://www.metro.net/projects/i-405-wilmington/

 

Schedule

The project is currently in the Project Approval and Environmental Document (PA&ED) phase and is expected to be completed in summer 2027. Following completion of the PA&ED phase, the team will begin the Design phase of the project with an anticipated completion date of Winter 2028.

 

Cost

The current overall capital outlay cost for Alternative 2 is estimated to be $228.6 million.

The current overall capital outlay cost for Alternative 3 is estimated to be $71.7 million.

 

Contact

Lourdes Kriste, Senior Manager, Transportation Planning, LA Metro

Metro Project Email: wilmington@metro.net

Gehan Attallah, Senior Transportation Engineer, Project Management, Caltrans District 7