For more information about this project, please contact the 405 Community Outreach Team at 405project@octa.net or 888-400-8994.

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 !
COMING SOON! Crews will begin removing falsework to continue construction of the new bridge.

The work will require full freeway closures.
 
  • Scheduled to begin in early December.

Please be advised that this work may be loud.
COMING SOON! Crews will install piles for the foundation of the new bridge.
 
  • Scheduled to begin in early December.
  • Crews may also conduct pile installation activities at night.

Please be advised that this work may be loud.
Eastbound (EB) Westminster will be reduced to one lane for crews to pour concrete for the new bridge.
 
  • Ongoing, 10 p.m. to 5 a.m. weekdays intermittently for approximately three months.

Please be advised that this work may be loud.
Crews are installing piles for the foundation of the new center columns.
 
  • Ongoing, 7 a.m. to 4 p.m. weekdays for approximately one month.
  • Crews may also conduct pile installation activities at night.

Please be advised that this work may be loud.
Crews are installing piles for the foundation of the widened freeway over the Santa Ana River.

  • Ongoing, 7 a.m. to 4 p.m. weekdays for approximately one month.
  • Crews may also conduct pile installation activities at night.

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.
Check Out our New Mobile App!
Now there’s a new mobile app to help residents and commuters navigate construction on the
I-405.

The I-405 Improvement Project app includes quick access to current traffic conditions, closures and detours, along with project updates and links to contact the project team. 

Now Available for Download on the Apple Store or Google Play!
55 on the 405
The speed limit on I-405 between I-605 and
SR-73 has changed from 65 mph to 55 mph.

The new speed limit was implemented in early October 2018 for the safety of the traveling public and crews during construction of the I-405 Improvement Project. The signs warning motorists of the new 55 mph are installed on the northbound and southbound sides of the freeway in the project area, and on all on-ramps between I-605 and Fairview Road in Costa Mesa. 

Click here for more information.
Don't Miss the 405 Community Outreach Team in Action!
If there is a community event in your area that you would like us to participate in, please contact us at 405project@octa.net .