MacArthur Boulevard under the 55 Freeway and the 55 Freeway northbound and southbound loop on-ramps will be closed from Monday, January 23, to Wednesday, January 25, 2023 from 9pm to 5am. The off-ramps and the straight on-ramps will remain open. Click here for more info.

OCTA crews will demolish the concrete barrier along the east side of the SR-55 bridge over MacArthur Boulevard to accommodate the freeway improvement project.

When:

9 p.m. to 5 a.m. nightly, beginning as early as Monday, January 23, to Wednesday, January 25, 2023.

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

Closures and Detours:

Motorists will be detoured to use Red Hill Avenue, Dyer Road, and Main Street. For more information, visit the interactive Closures and Detours Map.

About the project

Orange County Transportation Authority (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.