405 Improvement Project Updates

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: Southbound (SB) I-405 Loop On-Ramp from Bolsa Chica Road Closed for One Month Crews closed the southbound (SB) I-405 loop on-ramp from Bolsa Chica Road to accommodate the freeway widening.

The ramp closed Nov. 8 and is anticipated to reopen soon.

North Gate Road

Crews are working on the foundation of two walls along southbound I-405 adjacent to North Gate Road, which remains open.

The foundation consists of 130 cast-in-drilled-hole (CIDH) piles. Crews will use an auger to drill large holes, install forms and steel cages, and pour concrete into the holes to form the piles. The work is set to begin on the north end of the wall and will proceed south.

The job began Oct. 26 and is expected to take more than six weeks to complete. Work hours are from 7 a.m.-4 p.m.

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

This work may be loud. Southbound I-405 Loop Off-Ramp to Westminster Boulevard Extended Closure Continues The closure of the southbound I-405 loop off-ramp to eastbound Westminster Boulevard has been extended for an additional three months.

This closure will keep traffic flowing on both lanes of the existing adjacent SB on-ramp and accommodate the detour needed for the extended closure of the SB I-405 loop on-ramp from Bolsa Chica Road.

The new ramp is now set to open in mid-January.

Westbound SR-22 On-Ramp from Old Ranch Parkway Closed Crews closed the Old Ranch Parkway on-ramp to the westbound SR-22 on April 13 to accommodate the freeway widening.

Activities include demolition, excavation, grading, drainage and electrical system installation, and concrete pours and asphalt paving.

Daytime work hours are 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.

Northbound I-405 Loop Off-Ramp to Bolsa Avenue Closed Crews closed the northbound I-405 loop off-ramp to Bolsa on June 18 to accommodate freeway widening. The ramp is anticipated to reopen soon.

I-405 Lane Reductions for Center Median Work

Crews will continue to perform work in the center median on the I-405 at the Bolsa Avenue bridge. This work will require north- and southbound I-405 HOV lane reductions between Bolsa Avenue and Goldenwest.

Lane reductions will continue from 5 a.m.-noon, for approximately two more months. Sidewalk Closures on Seal Beach Boulevard for Signal Work

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, and electrical and foundation work.

Permanent traffic signal construction and the sidewalk closure will continue through December. 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.

SB I-405 Off-Ramp to Bolsa Chica Road Closed

Crews closed the SB I-405 off-ramp to Bolsa Chica on Oct. 27 and it will be closed for approximately three more months to advance construction on the Bolsa Chica bridge.

Almond Avenue

Crews are working on the foundation of a wall along Almond Avenue between Dahlia Circle and Jasmin Circle in College Park East 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.

Once this work is complete, crews will begin placing rebar, constructing forms and pouring concrete to construct the wall.

The work is ongoing from 7 a.m.-4 p.m. on weekdays and Saturdays, as needed.

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.