SR-55 (I-405 to I-5) Improvement Project
Construction Updates
OCTA, in cooperation with Caltrans, is improving 4 miles of SR-55 between I-405 and I-5. The project will add one regular lane and one carpool lane in each direction, as well as merge lanes between several interchanges.
Project Details
SR-55 is a vital north-south freeway that links central Orange County and beyond to the coastal region. More than 260,000 vehicles use this stretch of SR-55 every day, and that number is expected to grow to nearly 275,000 vehicles by 2040. To address this demand, OCTA and Caltrans are working together to deliver improvements to SR-55 between I-405 and I-5.
roadway- Add one regular lane and one carpool lane in each direction between I-405 and I-5
- Relocate local streets or narrow the width of some surface streets
structure- Improve four freeway bridges over MacArthur Boulevard, Dyer Road, Edinger Avenue and a railroad crossing
- Build one sound wall near the SR-55/I-5 interchange and construct retaining walls throughout the corridora
- Reconfigure on- and off-ramps
operational- Restripe regular lanes
- Restripe carpool lanes for continuous access, making it easier for motorists to enter and exit the lanes
- Add new merge lanes on northbound SR-55 between MacArthur Boulevard and Edinger Avenue
- Install overhead signs and lighting
details4 miles
Irvine, Santa Ana and Tustin
$475.1 million
August 2022 to 2026
Construction Closures & Detours
Social Media Feed
Latest Activity
- SR-55 Improvement Project Construction Alert - Week of Nov. 28, 2022
- SR-55 Improvement Project Construction Alert - Week of Nov. 21, 2022
- SR-55 Improvement Project Construction Alert - Week of Oct. 3, 2022
- SR-55 Improvement Project Construction Alert - Week of Sept. 26, 2022
- SR-55 Improvement Project Construction Alert - Week of Sept. 19, 2022
Contact the SR-55 Community Outreach Team
If you have questions or would like to request information in another language, please contact the Outreach Team at (888) 371-2555 or email SR55Info@octa.net.
Text "55FWYProject" to (877) 587-3065 to receive text alerts.