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San Diego Freeway (I-405) Improvement Project

Final Environmental Impact Report / Environmental Impact Statement

Preliminary De Minimis 4F Findings


The Interstate 405 (I-405) Improvement Project proposes to widen the corridor by adding one general purpose (GP) lane in each direction between Euclid Street and I-605 and one tolled Express Lane in each direction between State Route 73 (SR-73) and State Route 22 (SR-22) east of I-405 to be managed jointly as a tolled Express Facility with two lanes in each direction between SR-73 and I-605. The objective is to open the tolled Express Lanes with a HOV2+ occupancy free to encourage rideshare and transit usage. Operational adjustments to the tolled Express Lanes may be implemented based on demand, rates of speed, traffic volumes, and to meet financial covenants, maintenance and operational obligations. The proposed action would improve the freeway mainline and interchanges on I-405 in Orange and Los Angeles counties for approximately 16 miles between 0.2-mile south of Bristol Street and 1.4 miles north of I-605, as well as portions of SR-22, SR-73, and I-605 to reduce congestion and improve lane continuity through the corridor.

What is happening?

San Diego Freeway (I-405) Improvement Project
Public Notice for Notice of Intent to Adopt a De Minimis 4F Findings.

The review period is for 30 days, closing on July 21, 2016 at 5:00 pm.

Preliminary De Minimis 4F Findings.

Comments may be sent via email to  For general information about transportation issues, call the Public Information Office at (949) 724-2000.

You may also want to visit the OCTA project page.

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