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I-405 Improvement Project construction alert: Week of April 29

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.

The signs, which will be in place for the duration of the project, allow the California Highway Patrol to enforce the lower speed limit.

Caltrans advises motorists to slow down and proceed with caution whenever signs of highway work are present. This will significantly reduce the potential for incidents on the freeway. Also, motorists whose vehicles become disabled should pull off at the nearest exit, if possible.

Additionally, state law allows traffic fines to be doubled for violations that occur in highway work areas.

So remember, 55 on the 405, and slow down for everyone’s safety!

What
Crews are scheduled to demolish a portion of NB and SB I-405 bridge over the Santa Ana River. Crews also will demolish portions of the bridge structure within the river channel.
Where
Freeway lanes will be closed in both directions between Euclid Street and Harbor Boulevard.
 
This work will require freeway lane closures, not full freeway closures.
Euclid Street will be closed between Mt. Washington Street and Condor Avenue. 

 

The bike trail on the east side of the river also will be closed intermittently. Detours will be in place, and signs will be posted to guide motorists and bicyclists around the closures.
When
As early as  Wednesday, May 1: Demolition on the freeway will occur under lane closures on weeknights, 10 p.m. to 5 a.m. Demolition in the river will occur on weekdays, 7 a.m.-4 p.m. Mobilization may begin as early as 6 a.m.
 
As early as Wednesday, May 1 to Thursday, May 9: 9 p.m. to 6 a.m. Crews will demolish the freeway overhang on the SB I-405 side.
 
As early as Thursday, May 9 to Wednesday, May 15: 9 p.m. to 6 a.m. Crews will demolish the freeway overhang on the NB I-405 side.

As early as Wednesday, May 1 to Friday May 15, on weeknights: 9 p.m. to 5 a.m. Euclid Street will be closed between Mt. Washington Street and Condor Avenue.
Detours Detour No.1: Euclid Street/Ellis Avenue → Talbert Avenue → Ward Street → Ellis Avenue

Detour No. 2: Ellis Avenue → SB I-405 → Exit Harbor Avenue →  MacArthur Boulevard →  Euclid Street
 
 


 

The partial demolition of the Bolsa Avenue bridge has been postponed.

 

The 405 Community Outreach Team will provide additional information in a future construction alert. Please email [email protected] with questions.
  
 

What
Partial demolition of the Westminster Boulevard bridge. Crews will demolish a portion of the bridge over northbound (NB) and southbound (SB) I-405.
Where
The Westminster Boulevard bridge over NB and SB I-405. The freeway will be closed in both directions.between Westminster Boulevard and Springdale Street.
Additional Closures
  • NB I-405 loop on-ramp from NB Goldenwest Street
  • NB I-405 loop off-ramp to WB Westminster Boulevard
  • NB I-405 on-ramp from Westminster Boulevard
  • SB I-405 loop on-ramp from SB Bolsa Chica Road
  • SB I-405 loop on-ramp to EB Westminster Boulevard.
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
Mid- to Late May 2019
Detours
Detour information will be included in the project interactive map and in future alerts.
 
 
 

What
Falsework construction, which includes installing timber and steel beams to support construction of the new Slater Avenue bridge.
Where
Adjacent to Slater Avenue, on the NB and SB sides of I-405. The freeway will be closed in both directions between Brookhurst Street and Magnolia Street. NB and SB freeway closures will not be concurrent.
 
Additional Closures
  • NB I-405 loop on-ramp from NB Brookhurst Street
  • NB I-405 on-ramp from SB Brookhurst Street
  • SB I-405 loop on-ramp from SB Magnolia Street
  • SB I-405 on-ramp from EB Warner Avenue 
  • SB I-405 loop off-ramp onto EB Warner Avenue
  • SB I-405 off-ramp onto SB Brookhurst Street
  • SB I-405 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
As early as 11 p.m. to 5 a.m., Wednesday, May 1: NB I-405 will be closed from Brookhurst Street and Magnolia Street
 
As early as 11 p.m. to 5 a.m., Thursday, May 2: SB I-405 will be closed from Magnolia Street to Brookhurst Street
 
 
Detours
NB I-405 and NB Brookhurst Street Detour: NB Brookhurst Street → WB Warner Avenue → NB I-405

SB Brookhurst Street On-Ramp Detour: 
SB Brookhurst Street → WB Talbert Avenue → NB Magnolia Street → NB I-405

 

SB I-405 Detour: SB Magnolia Street → EB Talbert Avenue → SB I-405
 
SB I-405 on-ramp from EB Warner Avenue Detour:
EB Warner Avenue → SB Brookhurst Street → SB I-405 Loop On-ramp
 
SB I-405 loop off-ramp onto EB Warner Avenue Detour:
SB I-405 Magnolia Street off-ramp → EB Warner Avenue
 
SB I-405 off-ramp onto SB Brookhurst Street Detour:
SB I-405 Magnolia Street off-ramp → SB Magnolia Street → EB Talbert Avenue  → SB Brookhurst Street
 
SB I-405 on-ramp from SB Brookhurst Street Detour:
SB Brookhurst Street → EB Talbert Avenue → SB I-405 on-ramp
 
 
 
 
 
 
 
 

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

 

 
 
 

What
Underground utility work
Where
Milton Avenue will be fully closed between Willow Lane and Hefley Street
When
 
Began Monday, April 22, 2019, and expected to continue for approximately five months.
 
NOTE: If there is downtime between major activities, the contractor will, to the extent possible, reopen the roadway.

Work hours are 7 a.m. to 5 p.m., however, crews may also work at night.

Milton Avenue will be closed for the full duration of the work. Flaggers will be on site for local access, and driveways will be maintained. The sidewalk on the southwest side of Milton Avenue will be closed intermittently; pedestrians will be detoured to the opposite sidewalk.
 
Detour
Detour from Willow Lane
Westminster Boulevard → Springdale Street → Navajo Road → Hefley Street → Milton Avenue
 
Detour from Hefley Street 
Springdale Street → Westminster Boulevard → Willow Lane → Milton Avenue
 
 
 

What
Daytime pile installation 
Where
Adjacent to Magnolia Street bridge, on the NB and SB sides of I-405.
When
 
As early as a.m. to 4 p.m. ongoing, for approximately three weeks
 
Crews may conduct pile installation activities at night.
 
Why
Pile installation is necessary to construct the foundation of the new Magnolia Street bridge.
 
 

What
Daytime pile installation
Where
Adjacent to Goldenwest Street, on the northbound and southbound sides of I-405. Crews are working near the center median columns on the freeway, behind lane closures. 
When
7 a.m. – 4 p.m. ongoing, through late April on weekdays and Saturdays
 
Why
Pile installation is necessary to construct the foundation of the new Goldenwest Street bridge.
 
 
 

What
Crews will begin creating access holes in the sound wall and property walls behind residents’ homes to install temporary fencing. This will create a work area for demolition and reconstruction of the sound wall.
 
Residents are advised to move items away from the walls.
 
NOTE: Residents with pets will be contacted directly at least 72 hours prior to crews accessing their backyards.
 
Residents will receive additional notification prior to the start of sound wall demolition.
 
Please be advised that this work may be loud.
Where
NB I-405, between Springdale Street and Valley View Street.

When

 

As early as Monday, April 29: 6:30 a.m. to 4 p.m. and will take approximately two weeks on weekdays
 
 

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

 

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

When
As early as 9 p.m. to 6 a.m., Monday, April 29 to Friday, May 3 
 
 

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.