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

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

OCTA, in cooperation with Caltrans, is improving 4 miles of SR-55 between I-405 and I-5. The project will improve traffic flow and reduce travel time by adding one regular lane and one carpool lane in each direction. 

Construction Updates

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Project Overview

The Costa Mesa Freeway (SR-55) is one of the most heavily congested freeways in Southern California. SR-55 is a vital link to other major freeway systems in Orange County, and it is the only freeway providing a direct north-south connection between Central Orange County and the coastal region. Currently, SR-55 between I-405 and I-5 has four regular lanes and one carpool lane in each direction, as well as merge lanes between some interchanges. The project will add another regular lane and a carpool lane in each direction, as well as additional merge lanes on northbound SR-55 between interchanges at MacArthur Boulevard, Dyer Road and Edinger Avenue. This will improve traffic flow and reduce travel time on SR-55, and augment safety by making merging easier.

Funding

The $475.1 million project is funded with OC Go funds, also known as Measure M, Orange County’s half-cent sales tax for transportation improvements, as well as state and federal funds. The California Transportation Commission awarded OCTA $140 million in competitive state transportation funding to support the project.

OC GO

$52.7 million

State Funds

$261.9 million

Federal Funds

$160.5 million

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.

Project Partners

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