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Week of July 21, 2025

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Southbound MacArthur Boulevard Straight

On-Ramp Extended Closure

WHAT:

Crews will be reconstructing the southbound SR-55 MacArthur Boulevard straight on-ramp, which will require an extended closure of the ramp.

WHEN:

The on-ramp is expected to close as soon as midnight, Tuesday, July 22 and reopen to motorists by 5 a.m., Friday, Aug. 1.

Dyer Road Construction Activities and Closures

Dyer Road Bridge Girder Installation

Crews are expected to deliver bridge girders to the Dyer Road area during nighttime hours to minimize impacts to traffic. The girders, also known as supportive beams made out of concrete or steel, will be installed as part of the bridge reconstruction process. Dyer Road will be closed in each direction underneath the freeway from 8 p.m. to 5 a.m. nightly, Monday, July 28 through Friday, Aug. 1.

Northbound Dyer Road Loop On-Ramp 30-Day Closure

WHAT:

Crews will be reconstructing the northbound SR-55 Dyer Road loop on-ramp, which will require a 30-day closure of the ramp.

WHEN:

The on-ramp is expected to close as soon as 9 p.m., Monday, Aug. 11 and reopen to motorists by 5 a.m., Wednesday, Sept. 10.

Closures and Detours Map

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

About the Project

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.

octa.net/SR55South

888-371-2555

SR55Info@octa.net

@55FWYProject