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Retaining Wall Construction

Crews are constructing a new retaining wall along the northbound McFadden Avenue off-ramp. On Thursday, June 6, as early as 5 a.m. to 3 p.m., contractors will be pouring concrete for the foundation of the new retaining wall.

Crews will be accessing the site from the northbound off-ramp, which will remain open during the operation.

Don't miss the 40th Annual Tustin Street Fair and Chili Cook-Off on Sunday, June 2 from 11 a.m. to 6 p.m. in Old Town Tustin.

Enjoy the largest one-day chili cook-off with live music, contests, and a Kids Fun Zone.

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!

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.