California Department of Transportation

California Department of Transportation

Date: September 3, 2014
District: 4 - Oakland
Contact: Vince Jacala
Phone: (510) 286-5206

State Route 12 Jameson Canyon Road Widening Project Completed

OAKLAND Caltrans, the Solano Transportation Authority and the Napa County Transportation and Planning Agency today celebrated the completion of the much-anticipated State Route 12 Jameson Canyon Road Widening Project, which doubles the highway width from two to four lanes along the six-mile route from State Route 29 in Napa County to Red Top Road near Interstate 80 in Solano County.

“Truckers, businesses, and motorists will all benefit from this highway improvement project, which eases traffic congestion and makes the route safer for everyone,” said Caltrans Director Malcolm Dougherty.

State Route 12 links the Napa Valley, Sacramento Valley and several Bay Area counties, and widening it will reduce traffic congestion for about 35,000 motorists who travel SR-12 daily – and enable emergency responders to reach their destination faster.

In addition, a new six-mile-long concrete median barrier was constructed in the center of the highway to increase safety. The new safety feature will save lives and reduce injuries by preventing vehicles from drifting into traffic coming from the opposite direction.

The $127 million project received $55 million from Proposition 1B, a 2006 voter-approved transportation bond. To date, more than $17 billion in Proposition 1B funds have been put to work statewide for transportation purposes.

“Caltrans is committed to improving mobility throughout California,” said Caltrans District 4 Director Bijan Sartipi. “This commitment includes partnering with local transportation agencies to provide new solutions for North Bay commuters.”

The upgrades on SR-12 in Jameson Canyon are part of an ongoing effort to improve the transportation infrastructure in Solano and Napa counties. In June, Caltrans, the Solano Transportation Authority and the Metropolitan Transportation Commission broke ground on a project that is making major improvements to the Interstate 80/Interstate 680/SR-12 interchange.

Last July, a new $100 million truck complex opened along eastbound Interstate 80 near Fairfield in Solano County. The state-of-the-art facility fast-tracks inspections for more than two million trucks annually that travel from the Port of Oakland on I-80 through Northern California. For more information on the SR-12 project, and the hundreds of ongoing transportation projects in the Bay Area, visit

The mission of Caltrans is to provide a safe, sustainable, integrated and efficient transportation system to enhance California’s economy and livability. The department seeks to be a performance-driven, transparent and accountable organization that values its people, resources and partners, and meets new challenges through leadership, innovation and teamwork.

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