featured graphic for I-405 Improvement Project after COVID-19. Logo courtesy of OCTA.

I-405 Improvement Project construction alert: Wednesday, Sept. 29

For more information about this project, please contact the 405 Community Outreach Team at [email protected] or 888-400-8994, or visit octa.net/405improvement.

Si prefiere recibir información en español, por favor llame este numero 888-400-8994.

Nếu quý vị muốn nhận được thông tin này bằng tiếng Việt, xin vui lòng liên lạc với cô Lý Gia 888-662-6569.

To view and print a detailed list of closures and detours CLICK HERE!

Click to see closures and detours on the interactive map.

UPDATE! Springdale Street Bridge Demolition

The Springdale Street bridge is closed for approximately 18 months for demolition and reconstruction.

Crews will demolish the bridge over two nights under full freeway closures.

Northbound (NB) and southbound (SB) I-405 will be closed between Springdale and Westminster Boulevard.

  • NIGHT ONE: As early as 10 p.m. Friday, Oct. 1, to 7:30 a.m. Saturday, Oct. 2.
  • NIGHT TWO: As early as 10 p.m. Saturday, Oct. 2, to 8:30 a.m. Sunday, Oct. 3.

The freeway ramps will also be closed.

Additional nighttime demolition will occur for several weeks under freeway lane closures, and some daytime demolition also is anticipated.

Full freeway closures may be needed the nights of Friday, Oct. 8, and Saturday, Oct. 9.

The 405 Community Outreach Team will provide details in future alerts.

Sign up for project-wide and bridge-specific construction alerts at bit.ly/405-signup.

NEW! Southbound (SB) I-405 Closure for Bolsa Chica Road Bridge Falsework Removal

Crews will remove the falsework from the Bolsa Chica Road bridge over I-405. This work will require a SB I-405 closure between the SR-22 connector and Bolsa Chica.

SB I-405 will be closed 11 p.m. Monday, Oct. 4, to 5 a.m. Tuesday, Oct. 5.

NEW! Northbound (NB) I-405 Closure for Bolsa Chica Road Bridge Falsework Removal

Crews will remove the falsework from the Bolsa Chica Road bridge over I-405. This work will require a NB I-405 closure between Bolsa Chica and the SR-22 connector.

NB I-405 will be closed 11 p.m. Tuesday, Oct. 5, to 5 a.m. Wednesday, Oct. 6.

NEW! Southbound (SB) I-405 Closures for Brookhurst Street Bridge Falsework Removal

Crews will remove the falsework from the Brookhurst Street bridge over I-405. This work will require SB I-405 closures between Slater Avenue and Ward Street.

SB I-405 will be closed nightly 11 p.m. to 5 a.m. Monday, Oct. 4, to Thursday, Oct. 7.

NEW! Northbound (NB) I-405 Closures for Brookhurst Street Bridge Falsework Removal

Crews will remove the falsework from the Brookhurst Street bridge over I-405. This work will require NB I-405 closures between Ward Street and Slater Avenue.

NB I-405 will be closed nightly 11 p.m. to 5 a.m. Monday, Oct. 11, to Thursday, Oct. 14.

NEW! Southbound (SB) I-405 Closure for Fairview Road Bridge Falsework Removal

Crews will remove the falsework from the Fairview Road bridge over I-405. This work will require a SB I-405 closure between the SB I-405 off-ramp to Fairview and the SR-73 connector.

SB I-405 will be closed 11 p.m. Wednesday, Oct. 6, to 5 a.m. Thursday, Oct. 7.

UPDATE! Southbound (SB) I-405 Closures will continue for Goldenwest Street Bridge Falsework Installation

Crews will continue installing the falsework for the Goldenwest Street bridge over I-405. This work requires SB I-405 closures the week of Monday, Oct. 11.

NB I-405 closures are also anticipated to begin soon.

The 405 Community Outreach Team will provide detailed schedule, closure, and detour information in future alerts.

REMINDER! Southbound (SB) I-405 On-Ramp from Talbert Avenue Closed for Approximately ONE MONTH

Crews closed the SB I-405 on-ramp from Talbert on Monday, Sept. 20, for approximately one month to accommodate the freeway widening.

REMINDER! Northbound (NB) I-405 On-Ramp from Euclid Street closed for Approximately ONE MONTH

Crews closed the NB I-405 on-ramp from Euclid on Monday, Sept. 27, for approximately one month to accommodate the freeway widening.

REMINDER! Northbound (NB) I-405 Off-Ramp to Euclid Street Closed for Approximately ONE MONTH

Crews closed the NB I-405 off-ramp to Euclid on Sept. 8, for approximately one month to accommodate the freeway widening.

REMINDER! Northbound (NB) I-405 Loop Off-Ramp to Bolsa Avenue Closed

Crews closed the NB I-405 loop off-ramp to Bolsa on June 18, to accommodate the freeway widening. The ramp is anticipated to reopen in late November.

REMINDER! Westbound (WB) SR-22 On-Ramp from Old Ranch Parkway Closed

Crews closed the Old Ranch Parkway on-ramp to the WB SR-22 on April 13, forapproximately three more months to accommodate the freeway widening.

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

  • Daytime work hours are 7 a.m. to 4 p.m.
  • Crews may mobilize equipment as early as 6 a.m.
  • Nighttime work hours are 9 p.m. to 6 a.m.

UPDATE! 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, electrical and foundation work.

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

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.

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

Crews closed the SB I-405 off-ramp to Bolsa Chica on Oct. 27, 2020. The ramp will be closed for approximately three more months to advance construction on the Bolsa Chica bridge.

REMINDER! Southbound (SB) I-405 Loop Off-Ramp to Westminster Boulevard Closed

The closure of the SB I-405 loop off-ramp to eastbound Westminster Boulevard has been extended for an additional two months to allow crews to complete bridge construction that was delayed due to nesting owls.

The new ramp is now set to open in late October.

REMINDER! NB and SB 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 NB and SB I-405 HOV lane reductions between Bolsa Avenue and Goldenwest.

The lane reductions are set to continue 5 a.m. to 12 p.m., for approximately two more months.

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

Este trabajo puede ser ruidoso. El horario está sujeto a cambios debido a las inclemencias del tiempo o problemas operativos imprevistos.

Xin lưu ý là công việc này có thể gây nên những tiếng động ồn ào. Lịch trình có thể thay đổi vì thời tiết xấu hoặc những yếu tố công tác không thể dự đoán.

Construction Activities

Almond Avenue

UPDATE! Crews are working on the foundation of a wall along Almond Avenue between Dahlia Circle and
Jasmin Circle, adjacent to NB 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.

Ongoing 7 a.m. to 4 p.m. on weekdays and Saturdays, as needed through November 2021.

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

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

Please be advised that this work may be loud.

Magnolia Street

UPDATE! Crews will perform maintenance work on Magnolia Street. This work will require nightly lane reductions on Magnolia.

This work may require full Magnolia bridge closures as early as the week of Monday, Oct. 11.

The 405 Community Outreach Team will provide detailed schedule, closure and detour information in future alerts.

Please be advised that this work may be loud.

Warner Avenue

REMINDER! Crews are installing piles for the Warner Avenue bridge over I-405, in the center median and adjacent to NB/SB I-405 at Warner bridge; and a nearby retaining wall along westbound Warner.

Ongoing 7 a.m. to 4 p.m. and continuing on weekdays and Saturdays as needed for the next several weeks.

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

Please be advised that this work may be loud.

I-405/SR-73 HOV Connector

REMINDER! Crews are working on the foundation of the southbound (SB) I-405/SR-73 HOV connector bridge. The foundation consists of 8 cast-in-drilled hole (CIDH) and 35 steel pipe piles.

The CIDH activity includes installing large-diameter casings approximately 200 feet into the ground.

The steel pipe piles will be driven into the soil until reaching a hard layer of earth beneath the structure foundation.

Pile Installation activities are ongoing and will continue 7 a.m. to 4 p.m. on weekdays and weekends, as needed, through Spring 2022.

Daytime and nighttime lane reductions on SB I-405, between SR-73 and Bear Street are anticipated to support the work.

Crews may mobilize equipment as early as 6 a.m., and some activities may occur from 9 p.m. to 6 a.m. as needed.

Please be advised that this work may be loud.

The duration of this work may change depending on site conditions. Please be advised that this work may be loud. Dates and times are subject to change due to unforeseen operational factors or inclement weather.

This article was released by the Orange County Transportation Authority.