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I-405 Improvement Project construction alert: Week of Aug. 5

All closures and detours can be viewed in our interactive map and on our closure list.


What
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 Street. 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 onto Magnolia Street
  • SB I-405 loop off-ramp onto 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
NB Closures: As early as 11 p.m. tonight, Friday, Aug. 2 to 6 a.m. Saturday, Aug. 3 and again 11 p.m. Thursday, Aug. 8 to 5 a.m. Friday, Aug. 9
 
SB Closures: As early as 11 p.m. Friday, Aug. 9 to 5 a.m. Saturday, Aug. 10
 
The SB I-405 closure, which was originally scheduled for tonight, has been postponed to a later date.
Detours
NB I-405 Detour:
Exit NB 405 at Warner Avenue → Goldenwest Street → Goldenwest Street on-ramp
 

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
Utility relocation
Where
Goldenwest Street 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
Beginning as early as 10 p.m. to 5 a.m., Monday, Aug. 5 to Friday, Aug. 9
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
Crews will remove a sign structure over NB I-405 and WB SR-22
Where
NB I-405 and WB SR-22 will be completely closed for this work

 

Closure Details
  • NB I-405 to I-605 general purpose lane connector
  • NB I-405 to I-605 HOV connector
  • WB SR-22, between the WB 7th Street junction and I-605

 

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
As early as 11 p.m. Friday, Aug. 9 to 5 a.m. Saturday, Aug. 10 



Detours
NB I-405 to I-605 Connectors Detour:
Exit Seal Beach Boulevard off-ramp  → (Right to) NB Seal Beach Boulevard  → (Left to) WB Katella Avenue  → NB I-605 on-ramp

WB SR-22, between the WB 7th Street junction and I-605 Detour:
Exit WB SR-22 connector  → Exit Studebaker Road off-ramp  → (Left to) SB Studebaker Road  → (Left to) EB SR-22 on-ramp  →  NB I-405 connector




What
Crews will construct settlement fills for Westminster City channel widening. 
Where
Milton Avenue will be reduced to one lane between Hope Lutheran Church and Willow Lane.

Flaggers will be onsite to navigate motorists around the lane reduction.
When
As early as 7 a.m. to 4 p.m. Monday, Aug. 5 to Friday, Aug. 16, on weekdays


What
Vegetation removal activities 
Where
Talbert Avenue, between the SB I-405 on-ramp and Ward Street

Motorists should expect intermittent lane reductions for crews to conduct this work.

When
As early as 7 a.m. to 4 p.m., Monday, Aug. 5 to Friday, Aug. 9


What
Crews closed the off-ramp from NB SR-73 to Harbor Boulevard/Susan Street. A new temporary off-ramp – only to Harbor – has been constructed a half-mile up the freeway.
Where
SR-73 connector to Harbor Boulevard/Susan Street off-ramp is closed

When
The temporary ramp will be in place for approximately two years.
Detour
NB SR-73 Harbor Boulevard/Susan Street Off-Ramp Detour:
Temporary NB I-405 Harbor Off-Ramp → NB Harbor → EB South Coast Drive → Susan Street


What
Electrical work and street improvements
Where
Warner Avenue, between Brookhurst Street and Bushard Street

When
Ongoing, 6:30 a.m. to 4 p.m., on weekdays and Saturdays
 
Warner Avenue will be reduced to one lane intermittently between Brookhurst Street and Bushard Street.
 


What
Ocean View Channel widening 
Where
NB and SB sides of I-405, between Warner Avenue and Magnolia Street
When
Ongoing, 7 a.m. to 4 p.m., on weekdays
 
Crews may also work at night.
 


What
Bridge construction activities
Where
NB Bolsa Chica Road will be reduced to one lane intermittently between Duncannon Avenue and Garden Grove Boulevard
When
Ongoing, 9 a.m. to 3 p.m., on weekdays
 


What
Bridge construction activities
Where
NB Magnolia Street will be reduced to one lane intermittently between the Boomers driveway and Heil Avenue
When
Ongoing, 9 a.m. to 3 p.m., on weekdays
 

What
Pile installation activities for the widening of the I-405 bridge over Harbor Boulevard
Where
Adjacent to the SB I-405 bridge over Harbor Boulevard
When
As early as Monday, Aug. 5, 7 a.m. to 5 p.m., on weekdays and Saturdays
 
Crews may conduct pile installation activities at night.

 

Motorists should expect intermittent lane reductions on NB and SB Harbor Boulevard during the day and at night for crews to conduct this work.

What
Pile installation activities
Where
Adjacent to the Bolsa Chica Road bridge
When
As early as Monday, Aug. 13, 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
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 foundation of the new bridge
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 temporary shoring and the foundation of the new bridge.
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.

What
Utility relocation
Where
Spencer Avenue, between Pacific Street and Langley Street


Crews reduced the width of Spencer Avenue, however, it remains open with one lane in each direction.

When
Ongoing, a.m. to 4 p.m., on weekdays
 
Crews may also work at night.

What
Utility relocation
Where
On Talbert Avenue, between Ward Street and the LA Fitness driveway
When
Ongoing, 6:30 a.m. to 4 p.m.
 
Crews may also work at night.
 
Motorists should expect intermittent lane reductions during the day for crews to conduct this work.

What
Utility relocation
Where
On Heil Avenue, adjacent to NB I-405
When
Ongoing, 6:30 a.m. to 4 p.m.
 
Crews may also work at night.
 
The work zone will be in the alley adjacent to the pedestrian overcrossing.
 

What
Crews will demolish the remainder of the existing sound wall adjacent to SB I-405, between the Santa Ana River and Wyoming Circle.

 

A new sound wall is being constructed as part of the improvement project.
Where
SB I-405 between the Santa Ana River and Wyoming Circle
 
Crews will close the right lane on SB I-405, between Euclid Street and Harbor Boulevard, during the day for this work.
 
When
Demolition activities may begin as early as Monday, Aug. 5, and will take approximately two weeks.

 

Demolition activities and the freeway lane closure will occur approximately 11 a.m. to 5 a.m.
 
The lane will be open from 5 to 11 a.m., during peak travel time. 

Please be advised that this work may be loud.

What
Crews are working on the foundation of the new wall and loading out material.
Where
NB I-405, between Westminster Boulevard and Springdale Street
 
When
Ongoing, 7 a.m. to 4 p.m. and 10 p.m. to 5 a.m.

 

Crews will haul out materials behind freeway lane closures, which can only be done at night.

 



What
Crews are working on the foundation of the new wall and loading out material.
Where
SB I-405, adjacent to Bolsa Chica Road
When
Ongoing, 7 a.m. to 4 p.m., on weekdays 
 
Crews may also work at night.
 

What
Crews are working on the foundation of the new wall and loading out material.
Where
SB I-405, between Milan Street and Springdale Street
 
When
Ongoing, 6:30 a.m. to 4 p.m. and 10 p.m. to 5 a.m. 

Crews will haul out materials behind freeway lane closures, which can only be done at night.

What
Crews are working on the foundation of the new wall and loading out material.
Where
NB I-405, between Springdale Street and Valley View Street.
 
When
Ongoing, 6:30 a.m. to 4 p.m. and 10 p.m. to 5 a.m.

 

Crews will haul out materials behind freeway lane closures, which can only be done at night.

What
Crews are working on the foundation of the new wall and loading out material.

 

Where
Milan Street, between approximately Stratford Avenue and 200 feet south of Lowell Circle

When
Ongoing, during the day and at night on weekdays 
 
 

What
Crews are working on the foundation of the new wall and loading out material.
Where
Milan Street, between Bolsa Chica Road and Stratford Avenue
 
When
Ongoing, 7 a.m. to 4 p.m. and 10 p.m. to 5 a.m.

 

Crews will haul out materials behind freeway lane closures, which can only be done 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.