Featured graphic for the Orange County Transportation Authority

I-405 Improvement Project construction alert: Week of May 4

Governor Newsom has issued a “stay at home” executive order to help reduce the spread of COVID-19. Construction of public transportation projects is considered an essential service and is exempt from this order. Work will continue on the I-405 Improvement Project as scheduled.

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! Nightly Closures on Center Avenue set to begin Wednesday, May 6

Center Avenue between Beach Boulevard and One Pacific Plaza is set to close nightly so crews can continue electrical work. The closures also support striping and pavement for a new ramp.

The I-405 southbound (SB) Beach/Center off-ramp and on-ramp also will be closed.

  • Nightly closures are set to begin Wednesday, May 6, to Saturday, May 31, 9 p.m. to 6 a.m.

COMING SOON! SB I-405 on-ramp from Edinger Avenue to close for approximately one month

The SB I-405 on-ramp from Edinger is scheduled to close 10 p.m. Thursday, May 14. The ramp will be closed for approximately one month, and will be reconstructed as part of the freeway widening.

  • Scheduled to reopen Wednesday, June 17*

*Daytime closures are set to continue through May 14, 6 a.m. to 4 p.m.

UPDATE! Southbound (SB) Full Freeway Closure for McFadden Avenue bridge falsework construction

Crews are constructing falsework for the McFadden bridge over I-405 in Westminster

This work requires full SB ramp, lane and freeway closures of I-405 between Bolsa Avenue and Beach Boulevard

Closures are set for Wednesday, May 7, 10 p.m. to 5:30 a.m.

*Lanes will be reduced on NB I-405, between Beach and Bolsa.

NEW! Full Northbound (NB) Beach Boulevard closures for falsework construction

Crews will begin constructing falsework for the widened freeway over Beach Boulevard.

This work requires full NB ramp, lane and Beach Boulevard closures between Center Avenue and the freeway ramps.

Nightly closures are set to begin Monday, May 11, 9:30 p.m. to 6 a.m. for approximately one week on weeknights.

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

NEW! Full Southbound (SB) Beach Boulevard closures for falsework construction

Crews will begin constructing falsework for the widened freeway over Beach Boulevard.

This work requires full SB ramp, lane and Beach Boulevard closures between the freeway ramps and Center Avenue.

Nightly closures are set to begin Tuesday, May 19, 9:30 p.m. to 6 a.m. for approximately one week on weeknights.

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

UPDATE! Northbound (NB) Full Freeway Closure for Bushard Street bridge falsework construction

Crews are constructing falsework for the McFadden bridge over I-405 in Westminster

This work requires full NB ramp, lane and freeway closures of I-405 between Beach Boulevard and Bolsa Avenue

The closure is set for the night of Monday, May 18.

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

UPDATE! Southbound (SB) Full Freeway Closure for Bushard Street bridge falsework construction

Crews are constructing falsework for the Bushard bridge over I-405 in Fountain Valley.

This work requires full SB ramp, lane and freeway closures of I-405 between Warner Avenue and Slater Avenue

The closure is set for the night of Tuesday, May 19.

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

REMINDER! NB I-405 off-ramp to South Coast Drive closed for approximately one month

Crews closed the NB I-405 off-ramp to South Coast Drive. The ramp will be closed for approximately three more weeks as part of the freeway widening. The ramp is scheduled to reopen Saturday, May 30.

REMINDER! NB I-405 loop off-ramp to Westminster Boulevard closed for ONE YEAR

Crews closed the NB I-405 loop off-ramp to Westminster Boulevard. The ramp will be closed for approximately 12 months to allow construction of new walls and ramps at this location in one stage, eliminating multiple traffic shifts and confusion for motorists.

COMING SOON! NB I-405 off-ramp to Seal Beach Boulevard to close for approximately one month

The NB I-405 off-ramp to Seal Beach Boulevard is scheduled to close for approximately one month this summer. The ramp will be reconstructed as part of the freeway widening.

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

Construction Activities

Bolsa Avenue

COMING SOON! Crews will begin installing piles for the foundation for the new Bolsa bridge in late May or early June.

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

Goldenwest Street

Crews are scheduled to continue utility work on the Goldenwest Street bridge over I-405.

This work requires nightly lane reductions on Goldenwest, between Sowell Avenue and Bolsa Avenue.

  • Ongoing 10 p.m. to 5 a.m. weeknights

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.