Construction Updates

Ensure you have the latest information on construction activities and project milestones delivered directly to your inbox. Use the Stay Informed form to subscribe to our project notifications, which will begin once construction is underway. If you require further assistance, please contact our community outreach team—we are ready to assist you.

Click to download to view and print a detailed list of closures and detours.

Download Closure List

Upcoming Events

Community Meeting Info

OCTA's I-5 Improvement Project Community Outreach Team is hosting two community meetings on Wednesday, April 8 and Saturday, April 11.

These meetings are being held to allow the community to ask questions about the project.

Virtual
Wednesday, April 8
5:30 p.m. – 6:30 p.m.
Register at bit.ly/i-5projectmeeting

In-Person
Saturday, April 11
10:00 a.m. – 11:00 a.m.
Frontier Park 1400 Mitchell Ave., Tustin, CA 92780

Community Meeting Map

Download the Flyer

Sand Canyon Pile Installation

Crews are expected to perform nighttime pile driving at the Sand Canyon Avenue/I-5 Bridge. This work must take place at night to safely accommodate large equipment and reduce daytime tra¬ffic impacts.

What to Expect

Noise: Pile driving will generate loud noise and repetitive hammering sounds.
Vibration: Nearby properties may experience temporary ground vibrations.

Crews will mobilize equipment and begin closures as early as 10 p.m. Tuesday, Oct. 13 and drive piles from approximately 12 a.m. to 5 a.m. Wednesday, Oct. 14.

This work will require ramp, lane and connector closures. For additional information regarding closures and detours, view the interactive map below.

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

Download Flyer

Peters Canyon CIDH Work

Daytime construction activities will continue 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
CIDH Work: Ongoing through mid-October.

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.

Construction Closures & Detours

View the latest project closures and detours using the interactive map below.

Bridge Sections

Abutment: Support structure at each end of a bridge.

Bent: Support structure located beneath the middle portion of bridges.

Bridge Foundation Construction Methods

What is Pile Driving?

Pile driving is a commonly used method of constructing structure foundations.

To support the structure, a pre-fabricated steel or concrete beam or "pile" is hammered into the soil until it reaches a hard layer of earth beneath the structure foundation.

Activity is best carried out during the daytime due to:

Significant noise
More vibration

pile driving

Social Media Feed

I5 Improvement Project I405 to SR55

Construction Alert

Weekly Construction Alert

As of Oct. 9, 2026

Construction Alert

Sand Canyon Pile Installation Alert

As of Oct. 8, 2026

Construction Alert

Weekly Construction Alert

As of Oct. 02, 2026

Construction Alert

Weekly Construction Alert

As of Sept. 25, 2026

Construction Alert

Peters Canyon Drainage Demolition Alert

As of Sept. 22, 2026

Construction Alert

Jamboree Road Girder Installation Alert

As of Sept. 21, 2026

Photo Gallery

Crews performing drilled foundation work to support the I-5 bridge construction.

Crews are assembling reinforcing steel cages for bridge foundation construction beneath the I-5 bridge

Aerial photos of project area

I-5/Peters Canyon Hiking & Riding Trail

Jamboree and SR-261 Bridges at I-5

Segment 1

Segment 2

Contact the Community Outreach Team

i5Project405to55@octa.net

(888) 209-5550

I5improvement

I-5 (I-405 to SR-55) Improvement Project