405 Freeway Update
The Orange County Transportation Authority, in cooperation with Caltrans, is widening the San Diego Freeway (I405) between SR-73 and I-605.
The project is improving 16 miles of I-405 between the SR-73 freeway in Costa Mesa and I-605 near the Los Angeles County line, and projects are ongoing all along the construction corridor. 405
Construction updates are as follows:
• I-405 Northbound Seal Beach Boulevard Off-ramp Opens Soon The northbound I-405 offramp to Seal Beach Boulevard has been closed for nearly a month and is scheduled to reopen this week. It was closed to reconstruct the ramp as part of the freeway widening. Work includes demolition, excavation, grading, draining, electrical system installation, concrete pours and asphalt paving.
• Southbound I-405 Loop Off-Ramp to Westminster Boulevard to close for one year The southbound I-405 loop off-ramp to Westminster will close for approximately one year. The ramp is being reconstructed as part of the freeway widening.
The closure is set for 7 a.m. Aug. 17.
Crews built a temporary traffic signal for the southbound I-405 off-ramp to Springdale Street. It is anticipated that the signal will be turned on the morning of Tuesday, Aug. 11.
• I-405 Southbound Loop Off-ramp to Beach Boulevard to Close
The southbound I-405 loop off-ramp to northbound Beach Boulevard is anticipated to permanently close in early August. Motorists will use the Beach Boulevard/Center Avenue offramp from now on to access northbound and southbound Beach Boulevard.
The loop off-ramp is being eliminated to accommodate the widening of Beach Boulevard and the freeway. The Beach Boulevard/ Center Avenue off-ramp and Center Avenue are being reconstructed to accommodate the change in traffic volume.
• NB I-405 Loop Off-ramp to Westminster Boulevard Closed
Crews closed the northbound 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.
• NB I-405 Loop On-ramp from Goldenwest Street is Closed The NB I-405 loop on-ramp from Goldenwest Street is closed for approximately three months. The ramp is being reconstructed as part of the freeway widening. The ramp is scheduled to reopen Oct. 2.
The duration of this work may change depending on site conditions.
Construction Activities Navy Railroad: Crews are installing piles for the foundation of the freeway bridge over the railroad near the Westminster Mall. The work is ongoing from 7 a.m.-4 p.m. for approximately one month. This work may be loud.
Beach Boulevard: Full northbound and southbound Beach Boulevard closures continue for falsework construction.
• Crews are constructing falsework for the widened freeway over Beach Boulevard.
• This work requires full ramp, lane and Beach Boulevard closures between Center Avenue and the freeway ramps.
• This work also includes closing eastbound Center.
• Nightly closures are ongoing, 9:30 p.m.-6 a.m.
• This work may be loud.
East Garden Grove Channel:
Crews are continuing construction on the East Garden Grove Channel near the Newland Avenue bridge. Activities include installing shoring by vibrating in steel beams, excavation, demolishing concrete and hauling materials. Crews will also begin pile driving for the widened I-405 bridge over the channel.
Neighboring Projects Southern California Edison: Crews will close northbound and southbound I-405 lanes from Harbor Boulevard to Euclid Street. The closures are needed for overhead utility relocation.
Orange County Sanitation District: Crews are replacing sewer lines on Westminster Boulevard between Seal Beach Boulevard and Bolsa Chica Road. The project will replace and reconstruct nearly three miles of two parallel 36-inch diameter sewer pipelines on Westminster Boulevard between Seal Beach Boulevard and Rancho Road/ Hammon Place in the cities of Seal Beach and Westminster.
For more information on the I-405 Freeway Project, email
405project@octa.net or call (888) 400-8994. There’s a mobile app to help residents and commuters navigate construction on the I-405.
The app includes quick access to current traffic conditions, closures and detours, along with project updates and links to contact the project team. It is 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 2018 for the safety of the traveling public and crews during construction of the I-405 Improvement Project.
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