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Northbound I-405 full freeway closure: Slater Avenue falsework construction

Slater Avenue Construction

Falsework construction, which includes installing wood framing and steel beams to support construction of the new Slater Avenue bridge.
Adjacent to Slater Avenue, on the northbound (NB) side of I-405.
  • 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
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.

11 p.m. to 5 a.m. weekdays and 11 p.m. to 6 a.m. on weekends, beginning as early as March 25, and continuing through Saturday, April 6. No closures are anticipated on Saturday nights into Sunday mornings.
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

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.