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As crews continue to make steady progress backfilling and constructing the new retaining wall along the southbound MacArthur Boulevard on-ramp, an overnight concrete pour is planned on Wednesday, Sept. 11 as early as midnight to 5 a.m.

This work will require closing the southbound MacArthur Boulevard straight and loop on-ramps, as well as one outside lane on southbound SR-55 at MacArthur. Click here to view the detour map. 

Thank you to the neighboring businesses and communities for your patience while crews construct the wall.

Crews continue to remove vegetation and weeds along the project corridor, as well as ensure local streets are maintained for pedestrians and motorists.

Help keep Orange County clean! Please report graffiti and trash along the corridor to the Outreach Team at 888-371-2555 or email SR55Info@octa.net.

The Tustin Police Department is hosting its 27th Annual Open House event this Saturday, Sept. 7 from 11 a.m. to 3 p.m. Come enjoy live demonstrations, free hot dog lunches and shaved ice desserts along with several fun activities for your little ones! 

Don't forget to stop by the SR-55 Improvement Project booth to learn about construction activities, sign up for project alerts, and pick up one of our project-branded freebies. See you there!

Bookmark the closures and detours map for quick access to real-time construction information. Click on the construction icons to view activities and closures.

OCTA, in cooperation with Caltrans, is improving 4 miles of SR-55 between I-405 and I-5. The project will improve traffic flow and reduce travel time by adding one regular lane and one carpool lane in each direction. Also, the project will add merge lanes between several interchanges and stripe carpool lanes for continuous access, augmenting safety on the freeway by making merging easier. These enhancements are expected to create a better, smoother driving experience for motorists.