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I-405 Improvement Update

The Orange County Transportation Authority, in cooperation with Caltrans, is widening the San Diego Freeway (I-405) between SR-73 and I-605. The project is improving 16 miles of I-405 between the SR-73 freeway in Costa Mesa and I-605 near the Los Angeles County line. Construction updates are as follows: Sidewalk Closures on SB Boulevard

Crews will close the sidewalks at the intersection of Seal Beach Boulevard and Lampson Avenue for permanent traffic signal construction. Activities include the removal of existing sidewalk ramps, installation of new sidewalk ramps, and electrical and foundation work. Permanent traffic signal construction began June 1 and will continue for approximately six weeks on weekdays.

Daytime work hours are 9 a.m.-3 p.m.

Seal Beach Boulevard and Lampson will be intermittently reduced to two lanes at the intersection for the duration of the work.

Nighttime temporary traffic signal removal and permanent pole installation are anticipated in early-July.

Bolsa Bridge Traffic Shift

Crews have shifted traffic to the new side of the Bolsa bridge over I-405 in anticipation of partial demolition. Demolition began on the second half of the bridge on June 26 and 27 and will continue as early as 11 p.m., Saturday, July 10, to 8:30 a.m. Sunday, July 11.

Additional nighttime demolition will occur for several weeks under freeway lane closures. Some daytime demolition also is anticipated. Sign up for project-wide and bridge-specific construction alerts at

Bolsa Chica Road Traffic Signal Work

Crews will begin installing the permanent traffic signal at the Bolsa Chica Road/Old Bolsa Chica Road intersection. This work will require intermittent lane reductions on Bolsa Chica.

Activities include electrical, foundation and concrete work.

Work is scheduled to begin as early as Friday, July 2.

NB I-405 Loop Off-Ramp to Bolsa Avenue to Close

Crews have closed the northbound I-405 loop off-ramp to Bolsa for approximately three months to accommodate the freeway widening. It should reopen in mid-September.

NB I-405 Off-Ramp Closed

The northbound I-405 loop off-ramp to Bolsa is closed for approximately three months to accommodate freeway widening. It should reopen in mid-September. Activities include removal of the existing ramp, excavation, placement and compaction of base material, rebar and concrete work, paving, drainage installation, electrical work and striping.

SR-22 On-Ramp from Old Ranch Parkway Closed

The Old Ranch Parkway on-ramp to the westbound SR-22 closed April 13 for eight months to accommodate freeway widening. Activities include demolition, excavation, grading, drainage and electrical system installation, concrete pours and asphalt paving. Work hours are from 7 a.m.-4 p.m. Crews may mobilize equipment as early as 6 a.m. Nighttime work hours are 9 p.m.-6 a.m.

SB I-405 Off-Ramp to Bolsa Chica Road Closed Crews closed the southbound I-405 off-ramp to Bolsa Chica on Oct. 27 for approximately one year to advance construction on the Bolsa Chica bridge.

Almond Avenue Update

Demolition and reconstruction of the sound walls along Almond Avenue in College Park East are anticipated to start soon. Crews will install a temporary sound barrier prior to demolition.

Bolsa Chica Road

Continuation of pile driving for the Bolsa Chica bridge over I-405 along the center median and southbound I-405 at Bolsa Chica bridge. The work is ongoing 7 a.m.-4 p.m. on weekdays for approximately two months. Crews may mobilize equipment as early as 6 a.m., and some activities may occur from 9 p.m.-5 a.m. as needed.

Westminster Boulevard

Crews began working on the foundation of the retaining wall adjacent to Cascade Park along the southbound I-405 on-ramp from Westminster Boulevard. The foundation consists of approximately 80 cast-in-drilledhole (CIDH) piles.

Work is ongoing from 7 a.m.-4 p.m. on weekdays, for approximately one month. Crews may mobilize equipment as early as 6 a.m., and some activity may occur at night. Intermittent nighttime closures of the southbound I-405 on-ramp from Westminster may be required.

Additional construction activities including rebar, form and concrete activities are underway, and backfill and block wall installation is anticipated in July and August.

The 405 Community Outreach Team will provide detailed schedule information in future alerts. Email or call (888) 400-8994 for more information.

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