STA Projects and Construction

State Route 12 West - Jameson Canyon

The STA, the Napa County Transportation Planning Agency (NCTPA), and Caltrans are working together on the State Route 12 Widening (Jameson Canyon) Project. Through the state’s Corridor Mobility Improvement Account (CMIA), $74 million of Proposition 1B funds were programmed to this project in February 2007 for Phase 1 improvements.

These improvements would add 2 additional lanes and a concrete median barrier as needed. This amount falls short of the requested $96 million in funding for this phase. Caltrans has initiated the request for the shortfall to come from Interregional Transportation Improvement Program (ITIP) funds. This California Transportation Commission (CTC) is expected to take action on this ITIP request in June 2007.

Download the Jameson Canyon Project Map 05-02-07

Download the Initial Study with Proposed Mitigated Negative Declaration (CEQA) and Environmental Assessment (NEPA) for SR 12 Jameson Canyon Road Widening Project.

Comments were due by September 25, 2007.

Download the Caltrans Draft Project Report for the State Route 12 Jameson Canyon Project (August, 2008).

Download the attachments to the Caltrans Draft Project Report for the State Route 12 Jameson Canyon Project (August, 2008).

State Route 12 West - Truck Climbing Lane

This Caltrans project will build a $10.6 M truck climbing lane on westbound SR 12 from I-80 by approximately one mile.

Construction is expected to begin in the summer of 2009.

State Route 12 East - Safety Projects

The STA, working closely with law enforcement agencies and Caltrans, has developed a multi-faceted strategy for improving safety and mobility on this important interregional highway route from Rio Vista to Suisun City and Fairfield. The four key elements of the program are enforcement, legislation, public education and signage, and engineering.

Click here for more information.

State Route 113 Realignment Study

COMING SOON

For more information about plans and studies, visit the STA's Plans and Studies webpage.