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405 Improvement Project

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: I-405 Lane Reductions for Goldenwest Street Bridge Crews will continue excavating and installing piles for the center median of the Goldenwest Street bridge over the I-405. This requires northbound and southbound I-405 lane reductions between Bolsa Avenue and Goldenwest. The lane reductions will continue, 5 a.m. to 12 p.m., for approximately five weeks.

Sidewalk Closures on Seal Beach Boulevard Crews closed 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, electrical and foundation work. Permanent traffic signal construction began June 1 and will continue for approximately two more months on weekdays. Daytime work hours are 9 a.m. to 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.

This work may be loud. The schedule is subject to change due to inclement weather or unforeseen operational issues.

Bolsa Chica Road Traffic Signal Work Crews will begin support activities in anticipation of sound wall construction in early August. This work includes relocating the temporary concrete barriers and fencing along northbound Bolsa Chica. NB I-405 Loop Off-Ramp to Bolsa Avenue Closed Crews closed the northbound I-405 loop off-ramp to Bolsa on June 18 for approximately three months to accommodate the freeway widening. It should reopen in mid-September. 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 four more months to advance construction on the Bolsa Chica bridge.

SR-22 On-Ramp from Old Ranch Parkway Closed The Old Ranch Parkway onramp 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.

Almond Avenue Update

Crews are set to work on the foundation of a wall along Almond Avenue between Dahlia Circle and Jasmin Circle, adjacent to the northbound I-405. The foundation consists of approximately 250 cast-in-drilled-hole (CIDH) piles. This activity includes augering large holes, and installing forms and steel cages and pouring concrete into the holes to form the piles.

Following these activities, crews will begin placing rebar, constructing forms and pouring concrete to construct the wall.

Work began July 26 and hours are from 7 a.m.-4 p.m. on weekdays and Saturdays, as needed for approximately two months.

Nighttime activities may also occur between 9 p.m.-6 a.m.

Crews may mobilize equipment as early as 6 a.m., and some activity may occur at night. This work may be loud.

Westminster Boulevard

Crews will excavate and remove concrete from the center median of the Westminster Boulevard bridge.

The work is ongoing from 9 p.m.-6 a.m., for approximately one week.

Sign up for project-wide and bridge-specific construction alerts at

The I-405 Improvement Project mobile app provides quick access to current traffic conditions, closures and detours, along with project updates and links to contact the project team. Download it from the Apple Store or Google Play.

Email or call (888) 400-8994 for more information.

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