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

I-405 Improvement Project construction alert: Wednesday, December 8

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! Newland Street Bridge Closure and Demolition

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

Crews will demolish the bridge over two nights under full freeway closures. Additional nighttime demolition will occur for several weeks under freeway lane closures, and some daytime demolition also is anticipated.

Northbound (NB) I-405 will be closed between Warner Avenue and Magnolia Street, and southbound (SB) I-405 will be closed between Beach Boulevard and Edinger.

  • NIGHT ONE: As early as 11 p.m. Friday, Dec. 10, to 8 a.m. Saturday, Dec. 11.
  • NIGHT TWO: As early as 11 p.m. Saturday, Dec. 11, to 8 a.m. Sunday, Dec. 12, if needed.

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

REMINDER! Northbound (NB) I-405 Closures for Westminster Boulevard Bridge Falsework Installation

Crews will continue installing the falsework for the Westminster Boulevard bridge over I-405.

This work will require nightly NB I-405 closures between the NB I-405 off-ramp to Willow Lane and the NB I-405 on-ramp from Westminster Boulevard.

The closures are set to continue 11 p.m. to 5 a.m. TONIGHT, Wednesday, Dec. 8, to Friday, Dec. 17, on weeknights.

UPDATE! Southbound (SB) I-405 Closures for Westminster Boulevard Bridge Falsework Installation

Crews will continue installing the falsework for the Westminster Boulevard bridge over I-405.

This work will require nightly SB I-405 closures between Springdale Street and Westminster Boulevard.

The closures are anticipated for 11 p.m. to 7 a.m. Tuesday, Dec. 14, to Friday, Dec. 17.

The 405 Community Outreach Team will provide confirmed schedule information in future alerts.

NEW! Northbound (NB) I-405 Closure for K-rail Installation and Striping

Crews will place k-rail and restripe lanes on the outside shoulder of NB I-405. This work will require a full NB I-405 closure between Euclid Street/Ellis Avenue and Brookhurst Street.

The closure is anticipated for 11 p.m. Saturday, Dec. 18, to 7 a.m. Sunday, Dec. 19.

The 405 Community Outreach Team will provide detailed closure/detour information in future alerts.

REMINDER! Northbound (NB) Brookhurst Street Closures for Wall Construction

Crews are constructing a retaining wall adjacent to the Brookhurst Street bridge over I-405. This work will require nightly NB Brookhurst Street bridge closures.

The nightly closures are anticipated to begin as early as Friday, Dec. 10.

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

REMINDER! Southbound (SB) I-405 Closures for I-405/SR-73 Connector

Crews will continue constructing the widened I-405/SR-73 connector. This work will require nightly SB I-405 closures between the SB I-405 off-ramp to Brookhurst and the SB I-405 loop on-ramp from Harbor Boulevard.

The closures are set to continue 11 p.m. TONIGHT, Wednesday, Dec. 8, to 5 a.m. Thursday, Dec. 9.

REMINDER! Southbound (SB) I-405 Loop Off-Ramp to Westminster Boulevard Extended Closure to CONTINUE

The closure of the SB 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, which is anticipated early next month.

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

UPDATE! Southbound (SB) I-405 Loop On-Ramp from Bolsa Chica Road Closed for Approximately One Month

Crews closed the southbound (SB) I-405 loop on-ramp from Bolsa Chica Road to accommodate the freeway widening.

The ramp closed Monday, Nov. 8, and is anticipated to reopen in approximately one week.

COMING SOON! Northbound (NB) Brookhurst Street Freeway Ramps to Close for Approximately Two Months

Crews will close the NB I-405 off-ramp to Brookhurst and the NB I-405 on-ramp from Brookhurst for approximately two months in early January. The closures are needed to accommodate the freeway widening.

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

REMINDER! 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 is anticipated to reopen later this month.

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

North Gate Road

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

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 planned to begin on the north end of the wall and will proceed south.

Ongoing, 7 a.m. to 4 p.m. for approximately two more 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.

Springdale Street

REMINDER! Crews are installing shoring for construction of the new Springdale Street bridge. This work includes constructing a temporary structure by vibrating sheet piles into the ground.

Ongoing, 7 a.m. to 4 p.m. for approximately one more week on weekdays.

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

NEW! Crews will place concrete in the center median of the Magnolia Street bridge over I-405. This work will require Magnolia to be reduced to two lanes in each direction between Heil Avenue and Recreation Circle.

The lane reductions are anticipated 9 p.m. Thursday, Dec. 9, to 5 a.m. Friday, Dec. 10.

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.

Ward Street

REMINDER! Crews will begin installing piles for the Ward Street bridge over I-405, in the center median of the freeway.

Ongoing, 7 a.m. to 4 p.m. for approximately one week on weekdays and Saturdays as needed.

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.