Week of Aug. 24, 2026

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Upcoming Closures

Northbound and Southbound SR-55

Crews are expected to perform paving work along the outside shoulder on northbound and southbound SR-55, which will require closing two outside lanes in each direction from 9 p.m. to 5 a.m. nightly, Monday, Aug. 24 to Friday, Aug. 28.

Eastbound Dyer Road

Crews are expected to stripe eastbound (EB) Dyer Road underneath the freeway to reopen the street to three lanes in each direction, which will require closing EB Dyer and the inside lane on westbound Dyer from 9 p.m. to 5 a.m. nightly, Wednesday, Aug. 26 to Thursday, Aug. 27.

MacArthur Boulevard

Temporary Lane Configuration

To allow crews to safely perform work in the median, contractors are expected to place concrete barriers along eastbound and westbound MacArthur Boulevard on the east side of the bridge to shift traffic towards the outside and reduce the street to two lanes in each direction.

This work will require closing eastbound MacArthur and the inside lane on westbound MacArthur from 9 p.m. to 5 a.m. nightly, Wednesday, Aug. 26 to Thursday, Aug. 27.

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.