California Department of Transportation


Project Fact Sheet


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Project Purpose
The purpose of the project is to construct improvements to the I-205 interchange at or near Lammers Road and Eleventh Street which will:

  • Provide full access to both directions of I-205
  • Improve traffic operations at other interchanges, and;
  • Accommodate forecasted traffic growth.
The interchange improvements would either replace or retain the existing interchange at Eleventh Street/I-205 to provide full ramp movements, depending on the interchange configuration selected.  Connecting roads would be made to provide access between Eleventh Street on the south and Byron Road on the north.

The Need:
I-205 provides direct access to the western portion of the City of Tracy, a growing residential and commercial community and transportation hub in western San Joaquin County.   I-205 primarily functions to channel commuter and freight traffic from the north (Stockton and Sacramento), east (Manteca, Oakdale, Sonora), and south (Modesto, Merced) to the Bay Area via Interstate 580 and the Altamont Pass.  The west Tracy area is served by a partial directional interchange at Eleventh Street and a full interchange at Grant Line Road.  No interchange currently serves Lammers Road at I-205. Two build alternatives are being considered in the environmental study phase, including:

  • Alternative 1 – Lammers Road Diamond interchange, and;
  • Alternative 5A- Eleventh Street Partial Cloverleaf interchange.

A No-Build alternative is also being considered.

Without a new or modified interchange, traffic operations at Eleventh Street and Grant Line Road interchanges are expected to  worsen over the next 20 years, as the Tracy community continues to grow to the north and west, in accordance with the adopted general plan.

This project is developed through a partnership between the City of Tracy, the San Joaquin Council of Governments (SJCOG) and the California Department of Transportation (Caltrans).  Caltrans is the lead agency during the Project Approval & Environmental Document (PA&ED) process.  Preparation of  Plans, Specifications and Estimates (PS&E) and Project Construction phases would be by the City of Tracy. Right-of-Way (R/W) acquisition would be by Caltrans.: