First identified in 1959, SR-239 is a legislatively approved, but unconstructed route in the California state highway system. SR-239 is a potential multimodal link between SR-4 near Brentwood and I-205 west of Tracy in San Joaquin County. The route has not been adopted by the California Transportation Commission (CTC); however, Contra Costa County was awarded $14 million for initial study and planning under SAFETEA-LU in 2005. Administration of the study, now called TriLink, was transferred to the Contra Costa Transportation Authority (CCTA) in January 2012.

The TriLink study is exploring the possibility of creating a high quality transportation link from Brentwood to the I-580/205 corridor near Tracy. TriLink is looking at transportation improvements along four study corridors:

  • A North Link along Vasco Road
  • An Airport Connector Link to Byron Airport
  • A South Link along the Byron Highway
  • A Link to I-580

The comment period for the SR‐239 Tri‐link Draft Final Report continues until Friday May 23, 2014. A redline version showing changes to the September 2013 Draft Report (made public last fall) is available for your review at the link below. Also provided as separate documents are comments received through the vetting process, our study team’s responses to those comments, and an executive summary of the report.

Retrieve the Draft Final Report, matrix of comments and responses, original comments, and executive summary here. If you have not already done so, please submit your comments in writing to

At the end of May, the Final Report will be released to the public, marking the completion of the feasibility study. The momentum of the TriLink study will be carried forward to the next phase through the preparation of a Project Study Report.

About Kevin

Councilmember - City of Oakley, Manager of Mainframe Operations and Optimization – USS-POSCO INDUSTRIES, Co-Founder and Board Member - Friends of Oakley A Community Foundation, Commissioner - Contra Costa Transportation Authority, Board Member - Tri Delta Transit, Transplan, San Joaquin Joint Powers Authority and RD 2137, Advisory Board – Opportunity Junction
This entry was posted in SR 239. Bookmark the permalink.

1 Response to TRILINK / SR‐239 STUDY

  1. Josie Monaghan says:

    Please join us.

    Thank you, Josie Monaghan Founder ~ CEO East County Veterans Thrift Store E.C. Veterans Resource Center 708 W. 2nd Street Antioch, Ca. 94509 925.206.4113

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s