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I-405 Improvement Project construction alert: Week of Aug. 19

The Slater Avenue bridge over I-405 is scheduled to reopen Thursday night, Aug. 29.
 
Crews are scheduled to close the Talbert Avenue and Bushard Street bridges the same night, Thursday, Aug. 29, for pre-demolition activities.
 
Additional information regarding the closure and demolition of the bridges will be included in future alerts.
 
For more information, email the 405 Community Outreach Team at [email protected]
All closures and detours can be viewed in our interactive map and on our closure list.


What
Crews will continue removing falsework from the Slater Avenue bridge
Where
Adjacent to Slater Avenue, on the northbound (NB) and southbound sides of I-405
 
Note: NB and SB closures will not be implemented concurrently.

Closures:
  • NB I-405, between Brookhurst Street and Magnolia Street
  • NB I-405 loop on-ramp from NB Brookhurst Street
  • NB I-405 on-ramp from SB Brookhurst Street
  • SB I-405, between Magnolia Street and Brookhurst Street
  • SB I-405 loop on-ramp from SB Magnolia Street
  • SB I-405 on-ramp from EB Warner Avenue
  • SB I-405 off-ramp onto SB Brookhurst Street
  • SB I-405 loop on-ramp from SB Brookhurst Street

Detours will be in place, and signs will be posted to guide motorists around the closures. Motorists should expect delays and use alternate routes if possible.
When
NB Closures: Scheduled to occur 11 p.m. to 5 a.m., Monday, Aug. 19 to Wednesday, Aug. 21
 
SB Closures: Scheduled to occur 11 p.m. to 5 a.m., Thursday, Aug. 22 to Friday, Aug. 23
 
Depending on the progress of falsework removal, crews may close SB I-405 on the night of Wednesday, Aug. 21 instead of NB I-405.
 
Detours
NB I-405 and NB I-405 loop on-ramp from NB Brookhurst Street Detour:
NB Brookhurst Street → WB Warner Avenue → NB I-405
 
SB I-405 Detour:
SB Magnolia Street → EB Talbert Avenue → SB I-405




What
FULL NB AND SB FREEWAY CLOSURE for Utility Relocation
Where
NB and SB I-405 will be completely closed between Warner Avenue and Brookhurst Street



Detours will be in place, and signs will be posted to guide motorists around the closures. Motorists should expect delays and use alternate routes if possible.
When
Scheduled to occur 11 p.m. Friday, Aug. 23 to 5 a.m. Saturday, Aug. 24
Detours
NB I-405 Detour:  
Brookhurst Street → Warner Avenue → NB I-405
 
SB I-405 Detour:
Warner Avenue → Brookhurst Street → SB I-405

What
Utility relocation
Where
Goldenwest Street bridge will be closed between Bolsa Avenue and Sowell Avenue.

 

Additional Closures
  • SB I-405 off-ramp to Westminster Mall Road/Goldenwest Street
  • SB loop on-ramp from Westminster Mall Road/Goldenwest Street
Detours will be in place, and signs will be posted to guide motorists around the closures. Motorists should expect delays and use alternate routes if possible.
When
Scheduled to occur 10 p.m. to 5 a.m., Monday, Aug. 19, for approximately three weeks on weeknights
Detours

Goldenwest Street Bridge Detours:

  • Detour No. 1: SB Goldenwest Street  → EB Hazard Avenue → SB Beach Boulevard  → WB Bolsa Avenue
  • Detour No. 2: NB Goldenwest Street  → WB Edinger Avenue  → NB Edwards Street  
     EB Westminster Boulevard

What
Concrete placement
Where
Magnolia Street bridge will be closed between the I-405 freeway ramps

 

Additional Closures:
  • NB I-405 loop on-ramp from NB Magnolia Street
  • SB I-405 loop on-ramp from SB Magnolia Street
Detours will be in place, and signs will be posted to guide motorists around the closures. Motorists should expect delays and use alternate routes if possible.
When
Scheduled to occur 9 p.m. Friday, Aug. 23 to 9 a.m. Saturday, Aug. 24
Detours
NB Magnolia Street Bridge Detour:
  • Warner Avenue → Beach Boulevard → Edinger Avenue
  • Warner Avenue → Bushard Street → Edinger Avenue
SB Magnolia Street Bridge Detour:
  • Edinger Avenue → Beach Boulevard → Warner Avenue
  • Edinger Avenue → Bushard Street → Warner Avenue
 

What
POSTPONED: Falsework construction, which will include installing rebar to support construction of the new Magnolia Street bridge.
Where
Adjacent to Magnolia Street, on the NB and SB sides of I-405. NB and SB I-405 will be fully closed between Warner Avenue and Magnolia. Note: NB and SB closures will not be implemented concurrently.

 

Additional Closures:
  • NB I-405 on-ramp from Warner Avenue
  • NB I-405 loop on-ramp from Magnolia Street
  • NB I-405 off-ramp to Magnolia Street
  • SB I-405 loop off-ramp to Warner Avenue
  • SB I-405 loop on-ramp from Magnolia Street 
Detours will be in place, and signs will be posted to guide motorists around the closures. Motorists should expect delays and use alternate routes if possible.
When
This work has been postponed to a later date.
Detours
NB I-405 Detour:
Use the NB I-405 collector distributor road between Warner and Magnolia.
 

SB I-405 Detours:

  • Detour No. 1: Exit SB I-405 at Magnolia Street → Warner Avenue → Warner Avenue
    on-ramp
  • Detour No. 2: Exit SB I-405 at Beach Boulevard → Warner Avenue → Warner Avenue
    on-ramp


What
Concrete placement
Where
Adjacent to McFadden Avenue, along SB I-405
When
Scheduled to occur 5 a.m. to 3 p.m., Friday, Aug. 23
 

What
Pile installation activities for the widening of the Bolsa Chica Road bridge over I-405
Where
Adjacent to the Bolsa Chica Road bridge
When
Ongoing, 6:30 a.m. to 4 p.m., for approximately one month, on weekdays 
 
Crews may conduct pile installation activities at night.
 

What
Pile installation activities for the widening of the Fairview Road bridge over I-405
Where
Adjacent to the Fairview Road bridge on the NB and SB sides of I-405, and in the center median of the freeway
When
Ongoing, 6:30 a.m. to 4 p.m., on weekdays and Saturdays.
 
Crews may conduct pile installation activities at night.
 

What
Pile installation activities for the widening of the Westminster Boulevard bridge over I-405
Where
Adjacent to the Westminster Boulevard bridge
When
Ongoing, 6:30 a.m. to 4 p.m.
 
Crews may conduct pile installation activities at night.

What
Pile installation activities for the widening of the Bolsa Avenue bridge over I-405
Where
Adjacent to the Bolsa Avenue bridge
When
Ongoing, 6:30 a.m. to 4 p.m., on weekdays.
 
Crews may conduct pile installation activities 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.

To view all project closures and detours, please visit the interactive map or click here for a pdf list. 
 
This article was released by the Orange County Transportation Authority.