I-580/International Pkwy/Patterson Pass Interchange


Project Facts


The California Department of Transportation (Caltrans), in cooperation with the City of Tracy (City), proposes to improve the existing compact diamond (Type L‐ 1) interchange at Interstate (I-) 580 and International Parkway/Patterson Pass Road (hereafter I-580/International Parkway Interchange) between post miles 12.6 and 14.3. Increased traffic demand due to existing commercial growth and planned future development in San Joaquin County is creating the need to improve the interchange. The project proposes to modify the existing interchange into a Diverging Diamond Interchange (DDI).


Project Benefits

Purpose: The purpose of this project is to reduce congestion resulting from ongoing and planned development of the Cordes Ranch Specific Plan and to improve local circulation.

Need: This project is needed to accommodate the increase in traffic demand projected as part of the planned development in the Cordes Ranch Specific Plan Area and nearby areas in Tracy, and to discourage highway traffic from using local roadways, thereby improving local circulation.


Project Funding

The City of Tracy TIMF and RTIF funds are being used for the PA&ED and PS&E phases with additional TIMF and RTIF funds secured for the right-of-way and construction phases. The City will be submitting a funding application in July 2020 to the California Transportation Commission (CTC) for consideration of SB 1 TCEP funds and will pursue SJCOG Measure K funds to complete funding for the right-of-way and construction phases. The City has also submitted a funding application for the Infrastructure For Rebuilding America (INFRA) and for Better Utilizing Investments to Leverage Development (BUILD).

The total cost of the project (Project Approval & Environmental Document, Plans, Specifications & Estimates, Right of Way, and Construction costs) is estimated at $49.2 million.



Caltrans, City of Tracy, SJCOG


Project Schedule

Environmental Document Completed: 12/2020
Right of Way Acquisition Completed: 1/2022
Design Completed: 2/2022
Advertise: 5/2022
Begin Construction: 8/2022
Expected Completion: 12/2023


Project Contacts

City of Tracy Project Manager: Matt Brown

Phone: (209) 831-6457
E-mail: Matthew.Brown@cityoftracy.org

Caltrans Oversight Project Manager: Sinarath Pheng
Phone: (209) 948-7829
Email: Sinarath.Pheng@dot.ca.gov

Caltrans Public Information Office
Phone: (209) 948-7977
Email: district10publicaffairs@dot.ca.gov

Caltrans Oversight Senior Environmental Manager: Jennifer Lugo
Phone: (559) 779-6612
Email: jennifer.lugo@dot.ca.gov

For additional up-to-date information, please visit the project website at: 205and580interchanges.com/


Final Initial Study with Proposed Mitigated Negative Declaration - February 2020 (PDF) 14,912 KB