September 16–23, 2026
Newsletter Update: Thank you for subscribing to the Roadway Improvements & Traffic Advisories Newsletter. Going forward, we will send updates as needed regarding road closures and projects that may impact your commute across the City.
In addition to the projects listed below, you can find information on work being done to enhance our City on the Capital Improvement Projects Map and the Road Construction Map.
Help Shape Projects that Improve Mobility and Roadway Safety
Help enhance safety, accessibility, and mobility in Irvine. The City is exploring improvement options for Yale Avenue north of the I-405 Freeway as well as street crossings along the Venta Spur Trail. Learn more about these projects and share your feedback at an upcoming Community Workshop:
Learn more at cityofirvine.gov/mobilityprojects.
Jamboree & Michelson Pedestrian Bridge Lane Closure
Crews continue to build the tower walls for the Jamboree & Michelson Pedestrian Bridge project. This work requires the closure of the dedicated right-turn lane from westbound Michelson Drive to northbound Jamboree Road.
A temporary traffic pattern allows vehicles to make a right turn via a dedicated right-turn lane. Revised striping and signage are in place to direct motorists.
Work occurs weekdays from 7 a.m. to 3:30 p.m.
The Jamboree & Michelson Pedestrian Bridge aims to improve pedestrian safety, ease traffic congestion, and serve as a gateway monument for anyone entering the Irvine Business Complex. It is expected to be completed in 2027.
Every effort will be made to keep traffic flowing and minimize disruptions, but delays should be expected. Please consider using alternate routes.
For more information, email pm@cityofirvine.org or call the project hotline at 949-724-6676.
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Harvard Avenue & Michelson Drive Intersection Improvements
One eastbound and one westbound lane on Michelson Drive at Harvard Avenue are closed as work continues on the Harvard Avenue and Michelson Drive Intersection Improvements project.
Phase 3 is underway and will continue through September. Work occurs Monday through Friday from 9 a.m. to 3:30 p.m.
This intersection widening project will enhance traffic flow through the intersection and improve signal timing coordination along the Harvard Avenue and Michelson Drive corridors.
The City is removing and replacing asphalt pavement, curb and gutter, curb ramps, and sidewalk, as well as modifying traffic signal equipment behind temporary traffic control delineators and permanent K-rail lane closures. The project is anticipated to be completed this fall.
For more information, email pm@cityofirvine.org or call the project hotline at 949-724-6676.
Jamboree Road and Main Street Intersection Enhancements
The Jamboree Road and Main Street Intersection project is underway with work occurring weekdays from 9 a.m. to 3 p.m.
The project, which will continue through winter, will widen and enhance the intersection and reduce traffic congestion on Jamboree Road and Main Street. Specific improvements include lengthening left turn lanes, removing islands at southwest and southeast corners, modifying the traffic signal system, implementing drainage, water quality, and street lighting upgrades, as well as installing Class II bike lanes.
Every effort will be made to keep traffic flowing and minimize disruptions, but delays should be expected. Please consider using alternate routes.
For more information, email pm@cityofirvine.org or call the project hotline at 949-724-6676.
San Diego Creek Trail Closure
The San Diego Creek Trail between Spectrum and the Los Olivos community is closed daily from 7 a.m. to 4 p.m. through Friday, September 18, as crews remove vegetation along the trail.
State Route 55 Dyer Road Lane Closures
Orange County Transportation Authority crews will be performing pave work along Dyer Road, which requires closing eastbound and westbound Dyer Road underneath the freeway from 9 p.m. to 5 a.m. through Friday, September 18.
This work is part of the Orange County Transportation Authority's State Route 55 Improvement Project. Please visit octa.net/55Construction for more information.
State Route 133 Closures
The southbound State Route 133 between Great Park Boulevard and the I-5 Freeway will be closed through Thursday, September 17, from 10 p.m. to 5 a.m., and Friday, September 18, from 10 p.m. to 6 a.m.
In addition, the northbound State Route 133 between the I-5 Freeway and Great Park Boulevard will be closed through Thursday, September 17, from 10 p.m. to 5 a.m., and Friday, September 18, from 10 p.m. to 6 a.m.
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.
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