I-405 Improvement Project construction alert: Week of May 6

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 Tuesday, May 7: 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 Tuesday, May 7 to Friday, May 10: 9 p.m. to 6 a.m. Crews will demolish the freeway overhang on the SB I-405 side. As early as Tuesday, May 14 to Friday, May 17: 9 p.m. to 6 a.m. Crews will demolish the freeway overhang on the NB I-405 side. As early as Tuesday, May 7 to Friday May 17, 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 Goldenwest Street bridge.
Where	Adjacent to Goldenwest Street, on the NB and SB sides of I-405. SB I-405 will be closed between Springdale Street and Goldenwest Street. Additional Closure SB I-405 loop on-ramp from 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	As early as 11 p.m. to 5 a.m., Monday, May 6 to Saturday, May 11: SB I-405 will be closed between Springdale Street and Goldenwest
Detour	SB I-405 and SB I-405 loop on-ramp from Goldenwest Street Detour: SB Springdale Street → EB Bolsa Avenue → SB I-405 on-ramp from Bolsa Avenue

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 for temporary shoring
Where	Adjacent to the Ocean View Channel, near Daisy Avenue
When	As early as 7 a.m. to 4 p.m., Monday, May 6 for approximately two weeks, on weekdays Crews may conduct pile installation activities at night.

What	Daytime pile installation
Where	Adjacent to Magnolia Street bridge, in the center median
When	As early as 7 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 demolish the majority of the sound wall adjacent to northbound I-405 between Springdale Street and Valley View Street. A new sound wall is being constructed as part of the improvement project. A temporary sound barrier will be in place during construction of the new sound wall. Please be advised that this work may be loud.
Where	NB I-405, between Springdale Street and Valley View Street.
When	Demolition activities may begin as early as Monday, May 6. Activities will occur approximately 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 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 6:30 a.m. to 4 p.m. Monday, April 29 for 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., ongoing on weekdays

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.