I-580/International Pkwy/Patterson Pass Interchange


Project Description

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


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.


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.


Funding Source

City of Tracy TIMF and RTIF funds are being used for the PS&E phase with additional TIMF and RTIF funds secured for the right-of-way and construction phases. The City was approved for SB 1 TCEP funds and will pursue SJCOG Measure K funds to complete funding for the right-of-way and construction phases.


Project Cost/Programmed

 Programed Project Cost Capital $ Support $
Project Approval & Environmental Document $0 $1,000,000
Plans, Specifications, & Estimates $0 $3,200,000
Right of Way $8,000,000 $0
Construction $40,000,000 $0


Current Schedule

 Process Date
Project Approval & Environmental Document (M200) March 2021
Right of Way Certification (M410) April 2023
Ready to List (M460) April 2023
Approved Construction Contract (M500) October 2023
Project Completion (M600) April 2025


Project Status

Preparation of 100% Plans, Specifications, & Estimates & Right of Way Acquisition


Project Contact

Caltrans District 10 - Public Information Office
Phone: (209) 948-7977
Email: district10publicaffairs@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


Title VI Information

The California Department of Transportation (Caltrans) assures that no person shall, on the basis of race, color, or national origin, be excluded from participation in, be denied the benefits of, or be otherwise subjected to discrimination under any program or activity receiving Federal financial assistance, as required by Title VI of the Civil Rights Act of 1964, as amended, the Civil Rights Restoration Act of 1987, and Federal Executive Order 12898 (Federal Actions to Address Environmental Justice in Minority Populations and Low-Income Populations).

Caltrans will make every effort to ensure nondiscrimination in all of its programs and activities, whether they are federally funded or not, and that services and benefits are fairly distributed to all people, regardless of race, color, or national origin. In addition, Caltrans will facilitate meaningful participation in the transportation planning process in a nondiscriminatory manner.