Featured graphic for the Orange County Transportation Authority

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

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

Click to see closures and detours on the interactive map.

Southbound (SB) and Northbound (NB) Freeway Closures for Goldenwest Street bridge Falsework Removal

Crews will begin removing falsework for a portion of the new Goldenwest bridge this week.

This work will require full SB and NB I-405 freeway closures.

Detours will be in place for motorists to navigate around the closures. Motorists should expect delays and use alternate routes if possible.

Northbound Closure Details:


11 TONIGHT Tuesday, Dec. 17, to 5 a.m. Wednesday, Dec. 18
11 p.m. Thursday, Dec. 19, to 5 a.m. Friday, Dec. 20*
11 p.m. Sunday, Dec. 22, to 5 a.m. Monday, Dec. 23*

NB Closures:

NB I-405 between Bolsa and Goldenwest
NB I-405 loop on-ramp from NB Goldenwest

*The carpool lane and far left lane will also be closed on SB I-405 the nights of Dec. 19 and Dec. 22.

Southbound Closure Details:


11 p.m. Wednesday, Dec. 18, to 5 a.m. Thursday, Dec. 19
11 p.m. Monday, Dec. 23, to 5 a.m. Tuesday, Dec. 24*

SB Closures:

SB I-405 between Goldenwest and Bolsa Avenue
SB I-405 loop on-ramp from Goldenwest

*The carpool lane and far left lane will also be closed on NB I-405 the night of Dec. 23.

NEW! Daytime lane closures on Magnolia Street

NB Magnolia is reduced to one lane so crews can work on a wall adjacent to the bridge.

Scheduled to occur 9 a.m. to 4 p.m.:

  • Thursday, Dec. 19; and
  • Saturday, Dec. 21.

UPDATE! Northbound Beach Boulevard closure for pile driving activities

Crews will install piles for the foundation of the widened freeway over Beach, in the center median.

This work requires closing the northbound (NB) lanes on Beach.

  • Scheduled to to occur over four weekends in late December.

UPDATE! I-405 Traffic Shift for Bushard Street Bridge Center Columns

Crews will shift traffic on I-405 to create a work space for construction of the center columns of the Bushard bridge.

Scheduled to occur the night of:

  • Saturday, Dec. 21.

NEW! NB I-405 loop off-ramp to Westminster Boulevard to be closed

The NB I-405 loop off-ramp to Westminster will be completely closed for drainage work.

  • Scheduled to occur 9 p.m. Friday, Dec. 20, to 11 a.m. Saturday, Dec. 21.

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.