We want your input!

Use the visuals and videos linked below to explore the three project alternatives under consideration, then take the survey and share your thoughts!

• See visual renderings of the proposed alternatives
• See an animation of alternative 1: Displaced Left Turn animation
• See the slides presented at NVTA’s June 24Community Workshop on the project

Take Our Survey! 

QR code for the survey:

NVTA is advancing safety and congestion relief improvements at the SR 29/SR 12/Airport Boulevard and SR 12/North Kelly Road intersections in southern Napa County, also known as the Jameson Canyon interchange. Building on prior planning efforts and an existing 2008 environmental document that selected a tight diamond interchange concept, NVTA is conducting a performance-based alternatives analysis and environmental review in partnership with Caltrans District 4.

The study will explore up to three viable interchange alternatives, including both conventional and innovative designs such as a grade-separated “dogbone” roundabout, while considering multimodal access, context sensitivity, cost-effectiveness, and future growth. The goal of NVTA’s current work efforts is to refine the project footprint and update the environmental clearance to support selection of a preferred alternative and prepare for future design and construction phases.

Location: Southern Napa County, at SR 29 / SR 12 / Airport Blvd and SR 12 / N. Kelly Road

Timeline:

• 2024–2027: Environmental Revalidation

• 2027–2028: Design

• 2028–2029: Right-of-Way

• 2030: Construction (pending funding)

UPDATE: 6/17/26

UPDATE: June 2026

See the latest project fact sheet.

UPDATE: 9/17/25

The NVTA Board of Directors approved a contract with Kimley-Horn to study design alternatives at the congested intersection.