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

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.

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

Construction Closures & Detours

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



Latest Activity

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Construction Alert
Construction Alert
As of April 3, 2026
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COMMUNITY EVENT
COMMUNITY EVENT
As of April 1, 2026
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Construction Alert
Construction Alert
As of March 27, 2026
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Construction Alert
Construction Alert
As of March 20, 2026
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Construction Alert
Construction Alert
As of March 13, 2026
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Construction Alert
Construction Alert
As of March 6, 2026

Contact the Community Outreach Team