Napa County Route 12/29 Intersection Improvement Project


SCH Number
Lead Agency
Napa County
Document Title
Napa County Route 12/29 Intersection Improvement Project
Document Type
NEG - Negative Declaration
Present Land Use
Existing intersection and Right-of-Way; Surrounding General Plan designation is industrial. Surrounding zoning is Industrial Park Airport Compatibility.
Document Description
The Napa County Department of Public Works is proposing improvements to the State Route 12 and State Route 29 intersection in Napa County, California. The proposed project is located approximately six kilometers (km; 3.7 miles) south of Napa and approximately eight km (five miles) north of Vallejo, less than 1.6 km (one mile) west of American Canyon. The following improvements are proposed as part of the project. The construction of an additional northbound lane on Route 29 through the Route 12/29 intersection. This lane would be provided by widening the roadway into the existing unpaved median from 400 meters (1310 feet) south to 650 m (2130 feet) north of the intersection. Pavement widening would include one 3.6 m lane and one 0.8-m (2.6-foot) paved left shoulder. The extension of the two existing southbound left-turn lanes along Route 29 north of the intersection. These lanes would be extended by approximately 190 m (625 feet). The lanes would be 3.6 m (11.8 feet) in width and would include a 2.2m (7.0 foot) paved median. The relocation of existing traffic signals, electrical equipment, and signs in the median and outside of the existing shoulders to match the widened intersection. The addition of a second left turn lane from Airport Boulevard to Route 29 to provide additional capacity. The proposed project would be completed within state right-of-way. No additional right-of-way would be required.

Contact Information

Steve Lederer
Agency Name
Napa County
Contact Types
Lead/Public Agency


American Canyon
Cross Streets
Intersection of Highway 12 and 29 and Airport Road
Total Acres
State Highways
29, 12, 121, 221
Southern Pacific
Napa County Airport
Sheehy Creek and Napa River

Notice of Completion

Review Period Start
Review Period End
Development Types
Transportation:Other (Intersection Improvement)
Local Actions
Project Issues
Air Quality, Cultural Resources, Geology/Soils, Hazards & Hazardous Materials, Noise, Transportation
Reviewing Agencies
California Department of Conservation (DOC), California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW), California Department of Parks and Recreation, California Department of Transportation, District 4 (DOT), California Highway Patrol, California Native American Heritage Commission (NAHC), California Regional Water Quality Control Board, San Francisco Bay Region 2 (RWQCB), Caltrans, Division of Aeronautics, Department of Water Resources, Resources Agency, Department of Toxic Substances Control
Reviewing Agency Comments
Department of Toxic Substances Control

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613.

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