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I-405 Improvement Project construction alert: Week of Nov. 16

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!

Click to see closures and detours on the interactive map.

NEW! Bolsa Avenue Bridge to Close for 12 Hours

Crews will pour concrete for the Bolsa bridge over I-405. This work will require closing Bolsa between Goldenwest Street and Chestnut Street.

The closure is set for 7 p.m. Monday, Nov. 23, to 7 a.m. Tuesday, Nov. 24.

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

NEW! Full Northbound (NB) and Southbound (SB) Harbor Boulevard Closures for Falsework Grading

Crews will grade the falsework for the widened I-405 bridge over Harbor. This work will require full closures of NB and SB Harbor between the I-405 ramps.

The closures are set for:

  • NB Harbor: 10 p.m., Thursday, Nov. 19, to 2 a.m., Friday, Nov. 20.
  • SB Harbor: 2 a.m. to 5 a.m., Friday, Nov. 20.

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

COMING SOON! Southbound (SB) I-405 Off-Ramp to Euclid Street to Close for Approximately One Month

Crews will close the SB I-405 off-ramp to Euclid for approximately one month in early December to accommodate the freeway widening.

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

COMING SOON! Southbound (SB) I-405 On-Ramp to Westminster Boulevard to Close for Approximately One Month

Crews will close the SB I-405 on-ramp to Westminster for approximately one month in early December to accommodate the freeway widening.

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

REMINDER! Nightly Consecutive Ramp Closures Scheduled for Approximately Six Months

Crews are scheduled to close the following ramps, as needed, for six months to support bridge construction activities at Magnolia Street and Brookhurst Street:

  • Southbound (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! Northbound (NB) Beach Boulevard Lane Reductions

Crews are performing utility work on Beach Boulevard for approximately the next several weeks. This work requires daytime and nighttime lane reductions on NB Beach between McFadden and Edinger and nighttime closures of the NB I-405 off-ramp to Beach through mid-December.

Daytime lane reductions are set to continue 9 a.m. to 3 p.m.

  • Nighttime lane reductions are set to continue for as early as 7:30 p.m. to as late as 8 a.m.

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

Crews closed the SB I-405 off-ramp to Bolsa Chica Road for approximately one month to accommodate the freeway widening.

REMINDER! SB I-405 Off-Ramp to Harbor Boulevard Closed for Approximately One Month

The SB I-405 off-ramp to Harbor is closed and anticipated to open to traffic next week. The ramp is being reconstructed as part of the freeway widening project.

UPDATE! NB I-405 Loop On-Ramp from Harbor Boulevard is NOW OPEN!

The NB I-405 loop on-ramp from Harbor is now open to traffic.

Construction Activities

Fairview Road

REMINDER! Crews will continue installing piles for the foundation of a new retaining wall along northbound (NB) Fairview adjacent to Boston Way.

  • 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 activities may occur at night.

Edinger Avenue

NEW! Crews will demo the columns of the former Edinger bridge along Southbound (SB) I-405.

The demo activities are set for 10 p.m., Saturday, Nov. 21, to 8 a.m., Sunday, Nov. 22.

REMINDER! Crews are scheduled to begin pile driving along northbound (NB) and southbound (SB) I-405 for the foundation of the new Edinger Avenue bridge. Approximately 150 piles will be used.

  • Ongoing 7 a.m. to 4 p.m. on weekdays and Saturdays, for approximately one month.

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

Activities will be suspended Thursday, Nov. 26, and Friday, Nov. 27, for the Thanksgiving holiday.

Edwards Street

UPDATE! Crews will continue installing piles for the foundation for the Edwards bridge over I-405 in the center median in late November.

The pile driving is set to continue Monday, Nov. 23, 7 a.m. to 4 p.m., on weekdays and Saturdays, as needed, for approximately two months.

Vermont Street

REMINDER! Crews will continue working on the foundation of the wall along southbound (SB) I-405, behind homes on Vermont Street. The foundation consists of approximately 180 cast-in-drilled-hole (CIDH) piles. This activity includes augering large holes, and installing rebar cages and pouring concrete into the holes to form the piles.

  • Ongoing 7 a.m. to 4 p.m. on weekdays and Saturdays, for approximately two months.

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

Bolsa Avenue

REMINDER! Crews will continue installing piles for the wall along northbound (NB) I-405 between McFadden Avenue and Bolsa Avenue.

  • 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 activities may occur at night.

Bolsa Chica Road

COMING SOON! Crews will begin installing piles for the foundation of the center columns for the Bolsa Chica bridge over I-405, in the center median, west of the Bolsa Chica bridge.

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.