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SR-55 Improvement Project full freeway closure planned nightly April 26-27

Posted on April 23, 2024

Southern California Edison (SCE) plans to install new power lines on the SR-55 freeway, which will require a full closure of both northbound and southbound lanes between Edinger Avenue and Dyer Road. This activity will occur as early as 10 p.m. to 5 a.m. nightly, Friday, April 26 and Saturday, April 27. Crews may need to return the following weekend to complete the work.

 In addition, the following ramps, connectors, and streets will be closed:

  • Southbound Dyer Road off-ramps
  • Northbound Dyer Road on-ramps
  • Southbound Edinger Avenue on-ramp
  • Southbound McFadden Avenue on-ramp
  • Southbound I-5 to southbound SR-55 HOV connector
  • Southbound I-405 to northbound SR-55 HOV connector
  • Westbound Warner Avenue over SR-55

Detour signs will be posted in advance. Motorists are encouraged to plan ahead before traveling through the area. View the latest closures and detours here.

The Orange County Transportation Authority and Caltrans are improving 4 miles of SR-55 between I-5 to I-405. The project will improve traffic flow and reduce travel time by adding one regular lane and one carpool lane in each direction. More information at

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