Construction Alert as of Aug. 21: Interstate 5 (I-405 to SR-55)

As of Aug. 21, 2026

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

Image is of a clipboard with a traffic cone on it to encourage people to click on the link next to it to view a detailed closure list

To view and print a detailed list of closures and detours, CLICK HERE!

Segment 1 (I-405 to Yale Avenue)

Project Activities

ONGOING WORK

DOWNLOAD DETOUR MAP

NIGHTLY NB I-5 CLOSURES

FOR OVERHEAD SIGN REMOVAL

Construction activities are ongoing to remove overhead signage on northbound (NB) I-5. This work requires nightly full closures of NB I-5 between Alton Parkway and SR-133 and the southbound (SB) I-5 carpool (HOV) lane adjacent to the center.

For more information on these closures and associated detours, please view the detour map above, the Google Interactive Map, or plan your route using the Waze navigation app.

Anticipated Schedule

Friday, Aug. 21.

Anticipated Work Hours

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

NB lane closures start as early as 9 p.m., followed by the full closure at 10 p.m.

OTHER ACTIVITIES

Crews will continue electrical and sign work as well as paving activities on NB and SB I-5. Nighttime full ramp and connector closures, and street and freeway lane closures will be necessary as early as 9 p.m. Friday, Aug. 21 and continuing intermittently until 5 a.m. on Saturday, Aug. 29.

Anticipated Work Hours

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

Nighttime: 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 DETOUR MAP

BRIDGE GIRDER WORK AND FULL ROAD CLOSURES AT SR-261/I-5 BRIDGE

Nighttime construction activities and closures are expected to take place for bridge girder installation at the SR-261/I-5 bridge. This work will require full road closures of SR-261 at I-5. Crews are expected to intermittently alternate work and closures between NB and SB SR-261 on the same nights.

For more information on these closures and associated detours, please view the detour maps above, the Google Interactive Map, or plan your route using the Waze navigation app.

Anticipated Schedule

As early as Monday, Aug. 24 through Friday, Aug. 28.

Anticipated Work Hours

Daytime: As early as 6 a.m. to 4 p.m.

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

CIDH ACTIVITIES AT EL MODENA TUSTIN CHANNEL/I-5 BRIDGE

Daytime construction activities are expected to take place at the I-5/El Modena Tustin Channel Bridge for cast-in-drilled-hole (CIDH) work.

Daytime work is anticipated to occur behind concrete barriers and nighttime work requires intermittent NB and SB I-5 lane closures and related on- and off-ramps.

Anticipated Schedule

As early as the week of Aug. 24 through late September 2026.

Anticipated Work Hours

Daytime: As early as 6 a.m. to 4 p.m.

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

Image is of an infographic that demonstrates what cast-in-drilled-hole construction activity looks like

BRIDGE DEMOLITION & CIDH ACTIVITIES AT PETERS CANYON HIKING & RIDING TRAIL/I-5 BRIDGE

Picture depicts Peters Canyon Trail Closures

DOWNLOAD DETOUR MAP

Nighttime construction activities and closures are coming up for the demolition of the remaining outer portions of I-5 at the Peter Canyon Hiking & Riding Trail. This work requires full closures of westbound (WB) and eastbound (EB) Peters Canyon Trail between Bryan Avenue and Harvard Avenue/Walnut Avenue.

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

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.

At least one lane in each direction will remain open at all times, unless otherwise noted.

Anticipated Schedule

Demolition: As early as Monday, Aug. 31 through Saturday, Sept. 5, 2026.

CIDH: Ongoing through late 2026.

Anticipated Work Hours

Daytime: As early as 6 a.m. to 4 p.m.

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

RETAINING WALL AND SOUND WALL CONSTRUCTION

Retaining wall (RW) and sound wall (SW) construction activities, including demolition and wall construction, are ongoing and expected to continue along northbound (NB) and southbound (SB) I-5.

For the latest wall locations and construction schedule information, please visit the Google Interactive Map.

Anticipated Work Hours

Daytime: As early as 6 a.m. to 4 p.m.

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

Closures

Daytime work is anticipated to occur behind concrete barriers and nighttime work requires intermittent NB and SB I-5 lane closures and related on-and-off-ramps.

OTHER ACTIVITIES

Crews continue with general highway construction activities as well as bridge construction on and along NB and SB I-5 and NB and SB SR-261. Nighttime full ramp closures, freeway lane closures, and road closures are necessary starting as early as 10 p.m. Friday, Aug. 21 and continuing intermittently until 5 a.m. on Saturday, Aug. 29.

Neighboring Project

City of Irvine Long-Term Closure

Please note: Ongoing through October, the City of Irvine and Irvine Ranch Water District (IRWD) will continue water relocation activities on Culver near the I-5 bridge. This work requires WB Culver under the bridge to be reduced to one lane. Work and lane closures are expected Monday through Friday, from 9 a.m. to 3 p.m. Please contact the City of Irvine or IRWD for more information.

COMING SOON

BRIDGE GIRDER WORK AND FULL ROAD CLOSURES JAMBOREE ROAD/I-5 BRIDGE

Nighttime construction activities and closures are expected to take place for bridge girder installation at the Jamboree Road/I-5 bridge. This work will require full road closures of Jamboree at I-5. Crews are expected to alternate work and closures between both sides of Jamboree Road.

Anticipated Schedule

As early as the week of Sept. 7 or the week of Sept. 14, 2026.

Anticipated Work Hours

Daytime: As early as 6 a.m. to 4 p.m.

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

Please check back for additional schedule, closure and detour information.

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

Google Map

View the latest closures and detours using our Google Interactive Map, or plan your route using the Waze navigation app. 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!