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I-405 Improvement Project construction alert: Week of Aug. 10

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.

UPDATE! Heil Avenue Pedestrian Bridge Demolition

Crews will close the Heil pedestrian bridge over I-405 the night of Friday, Aug. 14, in anticipation of demolition.

The bridge will be demolished in one night, under a full freeway closure. Additional nighttime demolition will occur for several weeks under freeway lane closures. Some daytime demolition are also anticipated.

Demolition is set for 11 p.m. Saturday, Aug. 15, to 9 a.m. Sunday, Aug. 16.

I-405 will be closed in each direction during nighttime demolition.

REMINDER! Daytime Closures Are Set for Harbor Boulevard Pile Driving Activities

Crews are pile driving for the foundation of the I-405 bridge over Harbor Boulevard. This work requires full northbound (NB) ramp and lane closures on Harbor .

NB Harbor Pile Driving (weekend two)

Pile driving at NB Harbor will take place adjacent to the NB I-405 loop on-ramp from Harbor. This work will require a lane reduction of NB Harbor between the SB I-405 on-ramp and NB I-405 on-ramp, a lane reduction of the SB Harbor off-ramp and a full closure of the NB I-405 on-ramp.

Pile driving is set for 7 a.m. to 10 p.m. Saturday, Aug. 15, and again Sunday, Aug. 16.

REMINDER! Southbound I-405 Loop Off-Ramp to Westminster Boulevard to Close for ONE YEAR

The SB 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. The signal was turned on the morning of Tuesday, Aug. 11.

REMINDER! Northbound I-405 Loop Off-Ramp to Bolsa Avenue to Close For 24 hours

Crews will close the NB I-405 off-ramp to Bolsa to support the reconstruction of the Bolsa bridge over I-405.

The 24-hour closure is set for 10 p.m. Friday, Aug. 21, to 10 p.m. Saturday, Aug. 22.

UPDATE! Southbound I-405 Loop Off-Ramp to Beach Boulevard to PERMANENTLY CLOSE

The SB I-405 loop off-ramp to NB Beach Boulevard is anticipated to permanently close 10 p.m. Aug. 18. Motorists will use the Beach Boulevard/Center Avenue off-ramp from now on to access NB and SB Beach Boulevard.

The loop off-ramp is being eliminated to accommodate the widening of Beach Boulevard and of the freeway. The Beach Boulevard/Center Avenue off-ramp and Center Avenue are being reconstructed to accommodate the change in traffic volume.

NEW! Southbound (SB) Full Freeway Closures for Bolsa Avenue Bridge Falsework Removal

Crews will begin constructing the falsework for the Bolsa bridge over I-405. This work requires full SB freeway closures between Goldenwest Street and Bolsa.

The closures are set for 11 p.m. to 5 a.m. Monday, Aug. 17, to Friday, Aug. 21.

UPDATE! Southbound (SB) Full Freeway Closures for McFadden Avenue Bridge Falsework Removal

Crews will remove the falsework from the McFadden bridge. This work requires full SB freeway closures between Beach Boulevard and Bolsa Avenue.

The closures are set for TONIGHT 11 p.m. to 5 a.m. through Friday, Aug. 14.

UPDATE! Northbound (NB) and Southbound (SB) Euclid Street Intermittent Closures Are Set to Continue

Northbound and southbound Euclid lane reductions and directional closures will be scheduled intermittently 9 a.m. to 3 p.m. and 10 p.m. to 5 a.m. through Friday, Aug. 21, on weeknights.

UPDATE! Full Northbound (NB) and Southbound (SB) Beach Boulevard Closures for Pavement Operations and Falsework Removal

Crews began paving and falsework removal activities on Beach Boulevard. This activity requires NB and SB Beach Boulevard closures.

The closures are set for 11 p.m. to 5 a.m. Monday, Aug. 17, to Friday, Aug. 21.

NEW! Beach Boulevard Lane Reductions

Crews are conducting construction activities to reopen the NB I-405 loop on-ramp from Beach Boulevard. This work requires Beach Bouleavard to be reduced to one lane in each direction between McFadden Avenue and Edinger Avenue.

The lane reductions are set for 11 p.m. to 5 a.m. Wednesday, Aug. 12, to Friday, Aug. 14.

REMINDER! Northbound Beach Boulevard Freeway Ramps Closed for ONE MONTH

Crews closed the northbound (NB) loop on-ramp to NB I-405 and the NB I-405 off-ramp to NB Beach. The ramps will be closed for approximately one month to accommodate the freeway widening. The ramps are scheduled to reopen in mid-August.

Activities include demolition, excavation, grading, drainage and electrical system installation, concrete pours and asphalt paving.

UPDATE! Northbound (NB) I-405 Full Freeway Closures for Talbert Avenue Bridge Falsework Construction

Crews are constructing the falsework for the Talbert bridge over NB I-405.

This work requires full NB freeway closures between Euclid Street and Brookhurst Street.

The closures are set for 10 p.m. to 5:30 a.m. and will continue through Tuesday, Aug. 18, on weeknights.

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.

REMINDER! NB I-405 Loop On-Ramp from Goldenwest Street is Closed for Approximately THREE MONTHS

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.

Construction Activities

Goldenwest Street

UPDATE! Crews will continue demolishing the east side of the Goldenwest bridge over I-405.

  • Ongoing, 10 p.m. to 5 a.m. for approximately one more week
  • Some daytime demolition also is anticipated.

East Garden Grove Channel

UPDATE! 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.

  • Ongoing, 7 a.m. to 4 p.m. for approximately one month
  • Crews may mobilize equipment as early as 6 a.m.
  • Some activities, such as hauling materials, may occur at night.

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.