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 Interstate 405 (I-405) and Interstate 5 (I-5) has four general purpose lanes, one carpool lane and some auxiliary lanes in each direction. The heavy congestion on SR-55 is expected to increase with future demand. This project will add new lanes to this stretch of the freeway to reduce congestion and increase capacity.

About the Project

The design phase of the project is complete and construction is anticipated to begin in mid-2022. The project will add one general purpose lane, one carpool lane and auxiliary lanes in each direction of SR-55 between I-405 and I-5.

Funding

This OC Go project, also known as Measure M, Orange County’s half-cent sales tax, is being constructed in cooperation with Caltrans and will be funded through a combination of local, state and federal funds. The estimated project cost is $475.1 million.

Anticipated Project Schedule

Community Outreach

The Outreach Team is available to make a presentation to your neighborhood, organization or business. Please contact us with requests, questions or comments at SR55info@octa.net or 800-724-0353. Or, sign up for our project email alerts by selecting the Stay Informed tab at the top of this page.

Resources