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I-5 South County Improvements Project

I-5 South County Improvements Project

OCTA, in cooperation with Caltrans, is widening I-5 between SR-73 and El Toro Road. The project will improve 6.5 miles of I-5 through Mission Viejo, Laguna Niguel, Laguna Hills, and Lake Forest.

Construction Updates

OC Go Local Tax Dollars at Work

Project Improvements

For more information on each area, select an image below.

Construction Closures and Detours

I-5 South County Detour Map
Nighttime Closures
Daytime Closure
Lane Reduction
Long-term Closure

Contact the I-5 South County Improvements Project Outreach Team

If you have questions, please contact the Outreach Team by calling 949-614-0202 or email

Para obtener más información sobre el proyecto, llame al 949-614-0202 o envíe un correo electrónico a

Project Partners

california climate investments
cal trans
department of transportation
mission viejo
lake forest
laguna hills
laguna niquel