Construction Alert as of June 26: Interstate 5 (I-405 to SR-55)

As of June 26, 2026

有關此項目的更多信息，請聯繫 I-5 社區服务團隊，郵箱為 i5Project405to55@octa.net 或電話 888-209-5555，或查看 octa.net/i-5project.

이 프로젝트에 대한 자세한 내용은 I-5 Community Outreach Team에 이메일(i5Project405to55@octa.net) 또는 전화(888-209-5550)로 문의하시거나, octa.net/i-5project를방문해주시기바랍니다.

In observance of the Independence Day holiday, there will be no work or closures starting Friday, July 3 through Monday morning, July 6, including Saturday, July 4.

NATIONAL SAFETY MONTH

Speed matters. Slow down. Save lives.

As traffic lane patterns change on the freeway, please stay alert and follow the implemented 55 miles-per-hour speed limit throughout construction zones. Together, we can help ensure motorists and construction crews get home safely.

June is National Safety Month and the I-5 Improvement Project team encourages everyone to follow speed limits and help ensure construction crews and motorists get home safely.

Click on this image to view construction activities on the project interactive map.

Please note: As part of all ongoing construction activities, temporary rough grading and changes to roadway conditions may occur within the project area. Motorists are advised to use caution when traveling through the temporary construction zone and observe the posted 55 miles-per-hour speed limit.

Segment 1 (I-405 to Yale Avenue)

Project Activities

ONGOING WORK

Crews continue with temporary striping and k-rail placement along northbound (NB) and southbound (SB) I-5 as well as on SR-133. Nighttime full ramp closures in addition to street and freeway shoulder and lane closures will be necessary as early as 10 p.m. Friday, June 26 and continuing intermittently until 5 a.m. Thursday morning, July 2. See closures section above for more information.

The City of Irvine continues to carry out underground utility activities requiring the closure of the Sand Canyon Avenue median at the I-5 bridge starting as early as 9 p.m. Friday, June 26 through 5 a.m. Thursday, July 2.

Anticipated Work Hours

Daytime Hours: As early as 7 a.m. to 4 p.m.

Nighttime Hours: As early as 9 p.m. to 5 a.m.

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

*Freeway and street lane closures will occur regularly throughout the duration of the project's construction. At least one lane will be open to traffic at all times, unless otherwise specified. See closure section above for more information.

Segment 2 (Yale Avenue to SR-55)

Project Activities

ONGOING WORK

Image uses green arrows to outline an approved detour route for full road closures along SR-261 at I-5

DOWNLOAD SB SR-261 DETOUR MAP

NB & SB SR-261 FULL ROAD CLOSURES

AT THE I-5 BRIDGE

Nighttime construction activities and closures are ongoing for the demolition of the outer portions of I-5 at SR-261. The demolition of the outer portions of I-5 at NB SR-261 has been completed. Next week, crews will shift to close SB SR-261 to start demolition of the outer portion of I-5 on that side of the bridge.

See below for SB SR-261 detour map or check the closures section above for detour information.

Anticipated Schedule

NB SR-261: Completed.

SB SR-261: Week of June 29 beginning Monday night, June 29

through Wednesday night, July 1.

Anticipated Work Hours

Daytime Hours: As early as 7 a.m. to 4 p.m.

Nighttime Hours: As early as 10 p.m. to 5 a.m.

Look out for more information regarding future road closures for demolition work at the Jamboree Road, Peters Canyon Hiking and Riding Trail, and Culver Drive bridges at I-5.

Construction activity ongoing along NB SR-261 at the I-5 bridge

Construction activity ongoing along SB SR-261 at the I-5 bridge

I-5/PETERS CANYON HIKING & RIDING TRAIL

Daytime construction activities are ongoing at the I-5/Peters Canyon Hiking and Riding Trail Bridge for cast-in-drilled-hole (CIDH) work.

Anticipated Schedule

Ongoing through late 2026

Anticipated Work Hours

Daytime Hours: As early as 7 a.m. to 4 p.m.

Nighttime Hours: As early as 10 p.m. to 5 a.m.

Closures

Nighttime freeway lane and ramp closures will occur for restriping and concrete barrier placement. Lanes will be reduced and traffic will be shifted towards the center of the freeway while crews work on the outside bridge portions of NB and SB I-5 through the remainder of 2026.

Intermittent full closures of the Peters Canyon Hiking and Riding Trail at I-5 may occur through late 2026 for moving equipment in the construction area.

TRAFFIC SHIFTS ON RAMPS AND ROADWAY

Nighttime construction continues at the Tustin Ranch Road, Jamboree Road, and Culver Drive on- and off-ramps. Crews continue placing temporary striping and concrete barriers to reduce freeway lanes as traffic is being shifted towards the center of the roadway. This work facilitates the ongoing traffic shifts onto the temporary ramps allowing demolition and reconstruction of existing ramps to begin.

Anticipated Schedule

Traffic Shift Activity: Ongoing through early July.

Once shifted, traffic will remain on the temporary paved ramps through spring 2027 before being switched to the permanent, newly reconstructed ramps.

Reduced freeway lanes will also allow for crews to work on the outside portions of NB and SB I-5 through the remainder of 2026 for construction of retaining walls and bridge widening.

Anticipated Work Hours

Daytime Hours: As early as 7 a.m. to 4 p.m.

Nighttime Hours: As early as 10 p.m. to 5 a.m.

JAMBOREE AND SR-261 BRIDGES AT I-5

Construction activities including pile driving continue under the bridges at Jamboree Road/I-5 and SR-261/I-5.

Anticipated Schedule

Jamboree Road/I-5: Ongoing through late June.

SR-261/I-5: Ongoing through late July.

Anticipated Work Hours

Daytime Hours: As early as 7 a.m. to 4 p.m.

Nighttime Hours: As early as 10 p.m. to 5 a.m.

Closures

Crews have installed concrete barriers and closed the lanes nearest to the median on Jamboree Road at the I-5 bridge in both directions. At least one lane in each direction will remain open to traffic at all times unless otherwise noted. Lane closures and intermittent nighttime full closures on eastbound (EB) and westbound (WB) Jamboree Road at I-5 will continue through late 2026 to support I-5 widening work.

RETAINING WALL CONSTRUCTION

Construction activities are expected to take place along the NB I-5 Culver Drive on-ramp area for the construction of a new retaining wall (RW).

Additionally, construction activity for a new RW along the SB I-5 Culver Drive off-ramp started this week.

Anticipated Schedule

RW along NB I-5 Culver Drive on-ramp: Late July through late 2026.

RW along SB I-5 Culver Drive off-ramp: Ongoing through fall 2026.

Anticipated Work Hours

Daytime Hours: As early as 7 a.m. to 4 p.m.

Nighttime Hours: As early as 10 p.m. to 5 a.m.

Closures

Daytime work will occur behind concrete barriers while nighttime work will require freeway lane closures and intermittent closures of the NB I-5 Culver Drive on-ramp and the SB I-5 Culver Drive off-ramps.

BRIDGE, ELECTRICAL, CONCRETE, AND K-RAIL ACTIVITIES

Crews continue with bridge and electrical work, concrete barrier (k-rail) activities, and concrete pours on NB and SB I-5 and on SB SR-261. Nighttime full ramp closures and street and freeway lane closures are necessary starting as early as 10 p.m. Friday night, June 26 continuing intermittently until 5 a.m. on Thursday, July 2.

COMING SOON

Aerial view of the Culver Drive/I-5 Bridge

BRIDGE AT CULVER DRIVE/I-5

Construction activities are coming soon at the Culver Drive/I-5 bridge for bridge widening, including CIDH and pile driving to widen structures as a part of project improvements.

Please note: Pile driving activities may be loud at times and are scheduled during daytime hours.

Anticipated Schedule

Pile Driving: Mid-July through early August.

CIDH: November 2026.

Anticipated Work Hours

Daytime Hours: As early as 7 a.m. to 4 p.m.

Nighttime Hours: As early as 10 p.m. to 5 a.m.

24/7 Long-Term Closure: Crews will install concrete barriers and closed the lanes nearest the median on Culver Drive at the I-5 bridge in both directions. At least one lane in each direction will remain open at all times, unless otherwise noted.

Lane closures and intermittent nighttime full closures on eastbound (EB) and westbound (WB) Culver Drive at I-5 will occur to support I-5 widening work.

Check back for more information on these closures and corresponding detours.

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

Google Map

Bookmark the closures and detours map above for quick access to real-time construction information. Click on the construction icons to view activities and closure and detour information. Plan for additional travel time through the area. Detour signs will be in place to assist motorists.

Stay Connected

We invite you to sign up for project updates so you’ll be the first to know about upcoming construction activities, traffic changes, and community meetings and when we’ll be out in your community at local events - we hope you’ll stop by and say hello!