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.
⚠️ Full Freeway Closure Planned April 26-27
Southern California Edison (SCE) is scheduled to install new power lines across all lanes of SR-55. This work will require a full closure of northbound and southbound SR-55 between Edinger Avenue and Dyer Road. In addition, the following ramps, connectors, and street will be closed:
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Southbound Dyer Road off-ramps
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Northbound Dyer Road on-ramps
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Southbound Edinger Avenue on-ramp
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Southbound McFadden Avenue on-ramp
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Southbound I-5 to southbound SR-55 HOV connector
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Southbound I-405 to northbound SR-55 HOV connector
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Westbound Warner Avenue over SR-55
WHEN: Northbound and southbound SR-55 as early as 10 p.m. to 5 a.m. nightly, Friday, April 26 and Saturday, April 27.
For questions about the closure, contact the Outreach Team at SR55Info@octa.net.
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
$505.7 million
August 2022 to 2026
Kenyon Pointe and El Paseo Communities
To learn more about construction activities happening near the Kenyon Pointe and El Paseo communities, as well as neighborhood meetings and events, click here.
Dyer Road Bridge Barrier Demolition
To accommodate the freeway improvement project, the concrete barrier on the SR-55 bridge over Dyer Road is being demolished. This work is expected to continue through the end of December.
The following nighttime closures are scheduled from Friday, Dec. 20 through Friday, Dec. 27 between 10 p.m. and 6 a.m.:
- Eastbound and westbound Dyer under the freeway
- Northbound SR-55 Dyer loop on-ramp
- Two outside lanes in both directions of the freeway at Dyer
There will be no closures on Tuesday, Dec. 24 and Wednesday, Dec. 25 in observance of the Christmas holiday.
Northbound SR-55 MacArthur Boulevard Straight On-Ramp Extended Closure
Crews will be pouring concrete to reconstruct the northbound SR-55 MacArthur Boulevard straight on-ramp, which will require an extended closure of the ramp.
The on-ramp is expected to close for a continuous 10-day closure, as early as 9 p.m., Monday, Dec. 9 and reopen to motorists by 5 a.m., Thursday, Dec. 19.
This work may be loud. The schedule is subject to change due to inclement weather or unforeseen operational issues.
Construction Closures & Detours
Construction Accomplishments
Social Media Feed
Latest Activity
- SR-55 Improvement Project Construction Alert - Week of Aug. 26, 2024
- SR-55 Improvement Project Construction Alert - Week of Aug. 19, 2024
- SR-55 Improvement Project Construction Alert - Week of Aug. 12, 2024
- SR-55 Improvement Project Construction Alert - Week of Aug. 5, 2024
- SR-55 Improvement Project Construction Alert - Week of July 29, 2024
- SR-55 Improvement Project Construction Alert - Week of July 22, 2024
- SR-55 Improvement Project Construction Alert - Week of July 15, 2024
- SR-55 Improvement Project Construction Alert - Week of July 8, 2024
- SR-55 Improvement Project Construction Alert - Week of July 1, 2024
- SR-55 Improvement Project Construction Alert - Week of June 24, 2024
- SR-55 Improvement Project Construction Alert - Week of June 17, 2024
- SR-55 Improvement Project Construction Alert - Week of June 10, 2024
- SR-55 Improvement Project Construction Alert - Week of June 3, 2024
- SR-55 Improvement Project Construction Alert - Week of May 27, 2024
- SR-55 Improvement Project Construction Alert - Week of May 20, 2024
- SR-55 Improvement Project Construction Alert - Week of May 13, 2024
- SR-55 Improvement Project Construction Alert - Week of May 6, 2024
- SR-55 Improvement Project Construction Alert - Week of April 29, 2024
- SR-55 Improvement Project Construction Alert - Week of April 22, 2024
- SR-55 Improvement Project Construction Alert - Week of April 15, 2024
- SR-55 Improvement Project Construction Alert - Week of April 8, 2024
- SR-55 Improvement Project Construction Alert - Week of April 1, 2024
- SR-55 Improvement Project Construction Alert - Week of Mar. 25, 2024
- SR-55 Improvement Project Construction Alert - Week of Mar. 18, 2024
- SR-55 Improvement Project Construction Alert - Week of Mar. 11, 2024
- SR-55 Improvement Project Construction Alert - Week of Mar. 4, 2024
- SR-55 Improvement Project Construction Alert - Week of Feb. 26, 2024
- SR-55 Improvement Project Construction Alert - Week of Feb. 19, 2024
- SR-55 Improvement Project Construction Alert - Week of Feb. 12, 2024
- SR-55 Improvement Project Construction Alert - Week of Feb. 5, 2024
- SR-55 Improvement Project Construction Alert - Week of Jan. 29, 2024
- SR-55 Improvement Project Construction Alert - Week of Jan. 22, 2024
- SR-55 Improvement Project Construction Alert - Week of Jan. 15, 2024
- SR-55 Improvement Project Construction Alert - Week of Jan. 8, 2024
- SR-55 Improvement Project ConstructioJune 10, 2024n Alert - Week of Jan. 1, 2024
- SR-55 Improvement Project Construction Alert - Week of Dec. 25, 2023
- SR-55 Improvement Project Construction Alert - Week of Dec. 18, 2023
- SR-55 Improvement Project Construction Alert - Week of Dec. 11, 2023
- SR-55 Improvement Project Construction Alert - Week of Dec. 4, 2023
- SR-55 Improvement Project Construction Alert - Week of Nov. 27, 2023
- SR-55 Improvement Project Construction Alert - Week of Nov. 20, 2023
- SR-55 Improvement Project Construction Alert - Week of Nov. 13, 2023
- SR-55 Improvement Project Construction Alert - Week of Nov. 6, 2023
- SR-55 Improvement Project Construction Alert - Week of Oct. 30, 2023
- SR-55 Improvement Project Construction Alert - Week of Oct. 23, 2023
- SR-55 Improvement Project Construction Alert - Week of Oct. 16, 2023
- Southbound Dyer Road On-Ramp 30-Day Closure
- SR-55 Improvement Project Construction Alert - Week of Oct. 9, 2023
- SR-55 Improvement Project Construction Alert - Week of Oct. 2, 2023
- SR-55 Improvement Project Construction Alert - Week of Sept. 25, 2023
- SR-55 Improvement Project Construction Alert - Week of Sept. 18, 2023
- SR-55 Improvement Project Construction Alert - Week of Sept. 11, 2023
- SR-55 Improvement Project Construction Alert - Week of Sept. 4, 2023
- SR-55 Improvement Project Construction Alert - Week of Aug. 28, 2023
- SR-55 Improvement Project Construction Alert - Week of Aug. 21, 2023
- SR-55 Improvement Project Construction Alert - Week of Aug. 14, 2023
- SR-55 Improvement Project Construction Alert - Week of Aug. 7, 2023
- SR-55 Improvement Project Construction Alert - Week of July 31, 2023
- SR-55 Improvement Project Construction Alert - Week of July 24, 2023
- SR-55 Improvement Project Construction Alert - Week of July 17, 2023
- SR-55 Improvement Project Construction Alert - Week of July 10, 2023
- Edinger Avenue Bridge Barrier Demolition
- SR-55 Improvement Project Construction Alert - Week of July 3, 2023
- SR-55 Improvement Project Construction Alert - Week of June 26, 2023
- SR-55 Improvement Project Construction Alert - Week of June 19, 2023
- SR-55 Improvement Project Construction Alert - Week of June 12, 2023
- SR-55 Improvement Project Construction Alert - Week of June 5, 2023
- SR-55 Improvement Project Construction Alert - Week of May 29, 2023
- SR-55 Improvement Project Construction Alert -Week of May 22, 2023
- SR-55 Improvement Project Update - May 18, 2023
- SR-55 Improvement Project Construction Alert - Week of May 15, 2023
- SR-55 Improvement Project Construction Alert - Week of May 8, 2023
- SR-55 Improvement Project Construction Alert - Week of May 1, 2023
- SR-55 Improvement Project Construction Alert - Week of April 24, 2023
- SR-55 Improvement Project Construction Alert - Week of April 17, 2023
- SR-55 Improvement Project Construction Alert - Week of April 10, 2023
- Lane Channel Demolition and Reconstruction Begins Soon
- SR-55 Improvement Project Construction Alert - Week of April 3, 2023
- SR-55 Improvement Project Construction Alert - Week of Mar. 27, 2023
- SR-55 Improvement Project Construction Alert - Week of Mar. 20, 2023
- SR-55 Improvement Project Construction Alert - Week of Mar. 13, 2023
- SR-55 Improvement Project Construction Alert - Week of Mar. 6, 2023
- SR-55 Improvement Project Construction Alert - Week of Feb. 27, 2023
- SR-55 Improvement Project Construction Alert - Week of Feb. 20, 2023
- SR-55 Improvement Project Construction Alert - Week of Feb. 13, 2023
- SR-55 Improvement Project Construction Alert - Week of Feb. 6, 2023
- SR-55 Improvement Project Construction Alert - Week of Jan. 30, 2023
- SCHEDULE UPDATE: MacArthur Boulevard Bridge Barrier Demolition - Week of Jan. 23, 2023
- SR-55 Improvement Project Construction Alert - Week of Jan. 23, 2023
- MacArthur Boulevard Bridge Barrier Demolition - Week of Jan. 23, 2023
- SR-55 Improvement Project Construction Alert - Week of Jan. 16, 2023
- SR-55 Improvement Project Construction Alert - Week of Jan. 9, 2023
- SR-55 Improvement Project Construction Alert - Weeks of Dec. 19 and 26, 2022
- SR-55 Improvement Project Construction Alert - Week of Dec. 12, 2022
- SR-55 Improvement Project Construction Alert - Week of Dec. 5, 2022
- 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
Photo Gallery
Crews Installing Temporary Concrete Barriers along Southbound SR-55
Excavating for a Retaining Wall on Pullman Street
Southbound SR-55
Construction of a Retaining Wall Near Dyer Road
Construction of a Retaining Wall on Pullman Street
Crews Removing Overhead Sign Structure on Northbound SR-55
Demolition of SR-55 Concrete Barrier Over MacArthur Boulevard
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.