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WHAT:

Crews are in the process of constructing a new retaining wall along the southbound MacArthur Boulevard on-ramp. Contractors are expected to pour concrete for the foundation of the new retaining wall. This work will require closing the southbound MacArthur Boulevard on-ramps, as well as the two outside lanes on southbound SR-55.

WHEN: 

Midnight to 5 a.m. Tuesday, June 25.

This work may be loud. The schedule is subject to change due to inclement weather or unforeseen operational issues.

Thank you to everyone who stopped by the SR-55 Improvement Project booth at the City of Tustin Concerts in the Park event on Wednesday, June 19. Look for the SR-55 outreach team at a community event near you this summer!

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.