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WHAT:

Crews will be pouring concrete to reconstruct the northbound SR-55 MacArthur Boulevard straight on-ramp, which will require an extended closure of the ramp.

WHEN:

The on-ramp is expected to close for a continuous 10-day closure, as early as 9 p.m., Monday, Dec. 9 and reopen to motorists by 5 a.m., Thursday, Dec. 19.

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

WHAT:

Crews will demolish the concrete barrier along both sides of the SR-55 bridge over Dyer Road to accommodate the freeway improvements. This work will require these closures:

• Dyer Road under the freeway
• Northbound Dyer Road loop on-ramp
• Two outside lanes in both directions of the freeway at Dyer Road

WHEN:

9 p.m. to 5 a.m. nightly, beginning as soon as Monday, Dec. 16, and continuing for approximately three weeks.

To prepare for demolition, crews will perform nighttime sawcutting activities at the Dyer Road bridge the week of Dec. 9. This work will require directional closures of Dyer under the freeway. Eastbound and westbound Dyer will not be closed simultaneously.

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

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.