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I-405 Improvement Project construction alert: Week of April 22

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, April 24: Demolition on the freeway will occur under lane closures on weekday nights, 9 p.m. to 6 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, April 24 to Friday, April 26: 9 p.m. to 6 a.m. Crews will demolish the freeway overhang on the SB I-405 side.
 
As early as Monday, April 29 to Friday, May 3: 9 p.m. to 6 a.m. Crews will demolish the freeway overhang on the NB I-405 side.

As early as Wednesday, April 24 to Friday May 3, on weekdays: 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
 
 


 

What
Crews are scheduled to demolish a portion of the bridge over northbound (NB) and southbound (SB) I-405.
Where
The Bolsa Avenue bridge over NB and SB I-405. The freeway will be closed in both directions between Beach Boulevard and Goldenwest Street.
Additional Closures
  • NB I-405 loop on-ramp from NB Beach Boulevard
  • NB I-405 on-ramp from SB Beach Boulevard
  • NB I-405 on-ramp from Beach Boulevard road
  • NB I-405 loop off-ramp to WB Bolsa Avenue
  • SB I-405 loop on-ramp from SB Goldenwest Street/Westminster Mall Road
  • SB I-405 loop off-ramp to EB Bolsa Avenue
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 8 a.m., Saturday, April 27
Detours
NB I-405 Detour: 
  • Detour No. 1 – NB Beach Boulevard north off-ramp  NB Beach Boulevard 
→ WB SR-22 on-ramp → NB I-405
  • Detour No. 2 – NB Beach Boulevard north off-ramp → NB Beach Boulevard 
→ WB Westminster Boulevard → NB I-405 on-ramp

 
NB I-405 loop on-ramp from NB Beach Boulevard Detour:
WB Edinger Avenue → NB Goldenwest Street → NB I-405 loop on-ramp

 

NB I-405 on-ramp from Beach Boulevard road Detour:
WB Edinger Ave → NB Goldenwest St → NB I-405 Loop On-ramp 

 

NB I-405 on-ramp from SB Beach Boulevard Detour:
SB Beach Boulevard → WB Edinger Avenue → NB Goldenwest Street → NB I-405 on-ramp

 

NB I-405 loop off-ramp to WB Bolsa Avenue Detour:
Beach Boulevard North off-ramp → NB Beach Boulevard → WB Hazard Avenue → SB Goldenwest Street → WB Bolsa Avenue

 

SB I-405 Detour:
Goldenwest Street off-ramp→ EB Westminster Mall Road → SB Goldenwest Street → EB Edinger Avenue → SB I-405 on-ramp

 

SB I-405 loop on-ramp from SB Goldenwest Street/Westminster Mall Road Detour:
SB Goldenwest Street → EB Edinger Avenue → SB I-405 on-ramp

 

SB I-405 loop off-ramp to EB Bolsa Avenue Detour Detour:
Westminster Mall Road off-ramp → EB Westminster Mall Road → NB Goldenwest Street → EB Hazard Avenue → SB Hoover Street → EB Bolsa Avenue

 

SB I-405 on-ramp from Bolsa Avenue Detour:

SB Goldenwest Street → EB Edinger Avenue → SB I-405 on-ramp

 
 
 
 

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
Early 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
Settlement fill construction
Where
Adjacent to the Bolsa Chica Road bridge, on the SB side of I-405.
When
Daytime: As early as 7 a.m. to 4 p.m., ongoing, through Friday, April 26 on weekdays
Nighttime: As early as 10 p.m. to 5 a.m. ongoing, through Friday, April 26 on weekdays
 
Why These large piles of dirt will remain in place for up to three months to compact the soil beneath them for future bridge support structures.
 
 
 

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
 
As early as 7 a.m. Monday, April 22, 2019, 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
Utility location activities
Where
North Gate Road, adjacent to Beverly Manor, west of Seal Beach Rahabilitation Center
 
North Gate Road will be reduced to one lane. Eastbound and westbound traffic will be managed by flaggers.
When
 
As early as 7:30 a.m. to 4:30 p.m.,  Monday, April 22 to Friday, April 26
 
 
 

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 remove vegetation in advance of the future demolition and reconstruction of the sound wall. 
Where
NB I-405, between Springdale Street and Valley View Street.

When

 

As early as Monday, April 22: 6:30 a.m. to 4 p.m. and will take approximately three 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 15 to Saturday, April 20 
 
 

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.