August 20–27, 2025

In addition to the projects listed below that may impact your commute, you can find information on work being done to enhance our City on the Capital Improvement Projects Map and the Road Construction Map.

Lane Closures on Culver Drive and Alton Parkway

There will be multiple lane closures in both directions along Culver Drive and Alton Parkway next week as the City paves the intersection.

Work will take place Tuesday, August 26, through Friday, August 29, from 9 a.m. to 3 p.m. At certain times, left-turn traffic movements will be restricted and only one through lane of traffic movement will be maintained.

Significant traffic delays are anticipated. Motorists are strongly advised to use alternate routes and follow posted detours prior to reaching the intersection. 

This is the final phase of construction for this intersection improvement project, which is expected to be complete in September.

For more information, email pm@cityofirvine.org or call the project hotline at 949-724-6676.

JOST Bridge Construction Impacts to the I-5 Freeway

As work continues on the Jeffrey Open Space Trail (JOST) Bicycle and Pedestrian Bridge, falsework steel beams and plywood forms will be removed over and across the I-5 Freeway. This will require multiple nighttime lane closures and full freeway closures September 2–19.

All work will occur from 9 p.m. to 7 a.m. The first week of September will include the following closures:

Tuesday, September 2
Northbound and southbound I-5 Freeway lane closures

Wednesday, September 3, and Thursday, September 4
Southbound Jeffrey Road off-ramp and southbound I-5 Freeway lanes closures

Friday, September 5, and Saturday, September 6
Southbound I-5 Freeway full closure from Culver Drive to Jeffrey Road

View the construction schedule through September 19. Learn more about the JOST Bridge. 

Alton Parkway Traffic Signal Shutdown 

As part of the Alton Parkway Regional Traffic Signal Synchronization Program, work will occur on the traffic signal at the intersection of Alton Parkway and Kaiser Permanente / Hoag Irvine Tuesday, August 26. The traffic signal will be turned off or placed in red flash mode from 9 a.m. to 3 p.m.

Every effort will be made to keep traffic flowing and minimize disruptions, but delays should be expected, and motorists should consider using alternate routes. 

State Route 55 On-Ramp Extended Closure

Orange County Transportation Authority crews are reconstructing the southbound State Route 55 (SR-55) MacArthur Boulevard loop on-ramp, requiring an extended closure of the ramp. The on-ramp is closed and is expected to reopen to motorists by 5 a.m., Friday, August 29.

Detour signs have been posted. Motorists are encouraged to plan ahead before traveling through the area. View freeway detours.

Laguna Canyon Road On-ramp Closure

The Barranca Parkway on-ramp to southbound Laguna Canyon Road is closed nightly from 11 p.m. to 5 a.m. through Friday, August 22.

View detours as well as other work impacting The Toll Roads.

Learn about additional projects throughout our City, including project descriptions and work hours, as well as any lane closures and night and weekend work, which may occur intermittently on major arterials when permitted.