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I-405 Improvement Project construction alert: Week of April 26

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.

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

NEW! If you are currently receiving the I-405 Improvement Project automated call and text alerts, you will notice that these alerts will now start coming to you from our Project Helpline number (888-400-8994.) This will now allow you to call us right back and leave us a message if you have any questions or concerns about the project.

To opt out of text message alerts, simply reply “STOP”

To opt out of automated calls, simply press the number “7” on your phone’s keypad

Click to see closures and detours on the interactive map.

NEW! Full Harbor Boulevard Closure for Concrete Pour

Crews will perform concrete pours to connect new and existing I-405 bridges over Harbor. This work will require a full closure of southbound (SB) and northbound (NB) Harbor between the I-405 ramps.

The closures are set for 10 p.m. Thursday, April 29, to 6 a.m. Friday, April 30.

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

UPDATE! Talbert Avenue Bridge Is Now Open to Traffic!

The Talbert bridge is now open to traffic.

Remaining activities include final paving and striping, installing steel railing, adding bridge lighting, completing the eastbound sidewalk, and installing irrigation and landscaping

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

REMINDER! Full Closures of Bolsa Avenue Bridge Continue for Waterline Installation Work

Crews are continuing waterline work on the Bolsa bridge over I-405. This work requires full closures of Bolsa between Goldenwest Street and Chestnut Street.

The nightly bridge closures are set for 9 p.m. to 5 a.m. weeknights until Friday, April 30.

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

UPDATE! NB I-405 On-Ramp from Westminster Boulevard to Close for Approximately Seven Weeks

Crews will close the NB I-405 on-ramp from Westminster Boulevard for approximately seven weeks to accommodate the freeway widening.

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.

The NB I-405 on-ramp from Westminster is anticipated to close as early 10 p.m. Tuesday, May 11.

UPDATE! Full Closure of McFadden Avenue Bridge for Maintenance Work

Crews will continue maintenance work at McFadden Avenue bridge over I-405. This work will require a full closure of McFadden bridge between Sugar Drive and Huntington Village Lane.

The McFadden bridge closure is set for 9 p.m. to 5 a.m., Thursday, April 29, and Friday, April 30, if needed.

REMINDER! Full NB and SB I-405 Freeway Closures for Brookhurst Street Bridge Falsework Installation

Crews will continue installing falsework for the Brookhurst Street bridge over I-405. This work will require partial and full closures of the NB and SB I-405 between Talbert Avenue and Slater Avenue. Additionally, crews will close the NB and SB I-405 on-ramps from Brookhurst.

The SB I-405 freeway nightly closures are set for 10 p.m. Wednesday, April 28, to 5:30 a.m. Thursday, April 29.

The NB I-405 freeway nightly closures are set for 10 p.m. to 5:30 a.m. Thursday, April 29, to Friday, May 7, on weeknights.

Additional nights are anticipated Monday, May 10, to Wednesday, May 12.

NEW! Partial Lane Closures on Talbert Avenue Bridge for Paving Work

Crews will perform paving work for the Talbert Avenue center median. This work will require inside lane reductions on both sides of Talbert between Brookhurst Street and Cashew Street.

The Talbert lane closures are set for 9 a.m. to 3 p.m., Thursday, May 6, and Friday, May 7.

COMING SOON! Full Closure of the Warner Avenue Bridge and Bridge Demolition

Crews anticipate closing the Warner Avenue bridge for reconstruction in early spring. Complete demolition of the bridge is anticipated to occur after the bridge closure.

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

COMING SOON! Full Ellis Avenue Closures for Drainage Work

Crews will install a new drainage system across Ellis in early to mid May. This work will require nightly full closures of Ellis between the SB freeway ramps and Pacific Street.

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

COMING SOON! Full NB and SB I-405 Freeway Closures for Magnolia Street Bridge Closure Pour

Crews will perform concrete pours to connect the two new Magnolia bridge structures over I-405. This work will require full closures of the NB and SB I-405 in early May.

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

COMING SOON Full Magnolia Street Bridge Closures for Paving Work

Crews will perform paving work for the approaches to the second half of the Magnolia bridge. This work will require full closures of the Magnolia bridge between the freeway ramps in early May.

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

REMINDER! Nightly Consecutive Ramp Closures Scheduled for Approximately Six Months

Nightly closures of the following ramps will be scheduled, as needed, until May 2021 to support bridge construction activities at Magnolia and Brookhurst:

  • SB I-405 Loop On-Ramp from Magnolia
  • SB I-405 On-Ramp from Warner Avenue
  • SB I-405 Loop On-Ramp from Brookhurst

Closure hours are:

  • 10 p.m. to 5 a.m. weeknights
  • 10 p.m. to 7 a.m. weekends

REMINDER! Partial Lane Closures on Seal Beach Boulevard for Temporary Signal Work

Crews will continue traffic signal construction work at the intersection of Seal Beach Boulevard and Lampson Avenue and the intersection of Seal Beach Blvd. and the NB I-405 freeway ramps.

Activities include the installation of temporary signals and removal of existing signals which are being replaced.

Work is set for 10 p.m. Thursday, April 29, to 5 a.m. Friday, April 30.

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

Additional work is anticipated to continue in mid-May.

REMINDER! Westbound (WB) SR-22 On-Ramp from Old Ranch Parkway Closed for Approximately 8 Months

Crews closed the Old Ranch Parkway on-ramp to the WB SR-22 on April 13, forapproximately 8 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.

REMINDER! NB I-405 Loop Off-Ramp to Bolsa Avenue Closed Intermittently for Approximately One Month

Crews are closing the NB I-405 loop off-ramp to Bolsa intermittently for approximately one month on weeknights and Saturdays to work on a retaining wall.

NB I-405 intermittent ramp closures areongoing 8 p.m. to 6 a.m. as needed.

REMINDER! NB I-405 and SR-73 Off-Ramps to Fairview Road Closed for Approximately 100 Days

Crews closed the NB I-405 and SR-73 off-ramps to Fairview on April 5, 2021, for approximately 100 days to accommodate the freeway widening.

REMINDER! SB I-405 Off-Ramp to Bolsa Chica Road Closed for Approximately One Year

Crews closed the SB I-405 off-ramp to Bolsa Chica on Oct. 27, 2020 for approximately one year to advance construction on the Bolsa Chica bridge.

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.

Construction Activities

Almond Avenue

COMING SOON! Demolition and reconstruction of the sound walls along Almond Avenue are anticipated to commence as early as May 2021. Crews will install a temporary sound barrier prior to demolition.

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

I-405 near Bolsa

REMINDER! Crews will continue working on the foundation of the wall along southbound (SB) I-405, south of Bolsa Ave.

  • Ongoing 7 a.m. to 4 p.m. on weekdays and Saturdays, for several weeks.

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

Please be advised that this work may be loud.

Edwards Street

REMINDER! Crews will began working on the foundation of the retaining wall adjacent to Buckingham Park along the NB I-405 near Edwards bridge. The foundation consists of approximately 51 cast-in-drilled-hole (CIDH) piles.

As early as Wednesday, April 28, 7 a.m. to 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.

Please be advised that this work may be loud.

Fairview Road

UPDATE! Crews are scheduled to continue working on the retaining wall along northbound (NB) Fairview Road, south of the on-ramp to southbound (SB) I-405 and SB SR-73. This work will also require NB and SB Fairview intermittent lane reductions between McCormack Lane and freeway ramps. Additional activities include strip and form work and concrete pours.

Crews are anticipated to resume concrete pours for the retaining wall along NB Fairview as early as 9 p.m. to 6 a.m.:

  • Wednesday, April 28
  • Monday, May 3
  • Friday, May 7

Nightly intermittent lane reductions are ongoing 10 p.m. to 5 a.m. and continue through the end of May on weeknights.

Retaining wall activities are ongoing 7 a.m. to 4 p.m. on weekdays.

Crews may mobilize equipment as early as 6 a.m. and some activity may occur at night from 9 p.m. to 6 a.m. as needed.

Concrete pours are anticipated in late March and early April.

Please be advised that this work may be loud.

Goldenwest Street

COMING SOON! Pile driving activities are anticipated to resume in mid-May for the Goldenwest bridge over I-405.

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

Please be advised that this work may be loud.

Harbor Boulevard

REMINDER! Crews will continue installing piles for the foundation of a wall along SB I-405 between Harbor and Fairview Road.

  • Ongoing 7 a.m. to 4 p.m. 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.

Heil Avenue

REMINDER! Crews continue construction activities for the Heil pedestrian bridge over I-405.

Crews are forming the footings and columns, and will begin to construct the falsework soon to form the spans over the freeway.

This work requires an extended closure of Heil between Ross Lane and Landau Lane.

The closure began on Wednesday, Dec. 30, and is expected to continue for approximately seven months.

Residential access will be maintained at all times.

McFadden Avenue

REMINDER! Crews are installing CIDH piles for the foundation of the sound wall adjacent to Sugar Drive and Shasta Lane. This work will continue for approximately one week.

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

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

Please be advised that this work may be loud.

Milan Street

COMING SOON! Sidewalk, curb and gutter work along Milan between approximately Stratford Avenue and Lowell Circle has been postponed.

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

Westminster Boulevard

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

  • Ongoing 7 a.m. to 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. Please note intermittent nighttime closures of the SB I-405 on-ramp from Westminster may be required.

Additional construction activities including rebar, form and concrete activities are anticipated in May/June and backfill and block wall installation are anticipated in July/August.

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

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.