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June 16, 2025

Soscol Junction Interchange Named Top 3 Finalist for State Transportation Award

Rendering of what the Soscol Junction construction project will look like upon completion

Built in partnership with Caltrans District 4 and the Napa Valley Transportation Authority (NVTA), Napa County’s Soscol Junction Interchange project was honored as a top three finalist in the Interchange Project category at the 36th annual California Transportation Foundation (CTF) Transportation Awards on June 12. Although Soscol Junction did not win, this prestigious recognition celebrates excellence and innovation in transportation projects across the state.

“The Soscol Junction Interchange addresses one of Napa County’s most critical and persistent traffic bottlenecks. By replacing the signalized intersection at State Routes 29/221 and Soscol Ferry Road with two roundabouts and an overpass, the project significantly improves safety and reduces congestion for commuters, residents and visitors,” said Caltrans District Director Dina El-Tawansy.

The Soscol Junction Interchange addresses one of Napa County’s most critical and persistent traffic bottlenecks. By replacing the signalized intersection at State Routes 29/221 and Soscol Ferry Road with two roundabouts and an overpass, the project significantly improves safety and reduces congestion for commuters, residents, and visitors.

“This recognition is especially meaningful — our team has poured more than a decade of dedication into making the Soscol Junction a reality,” said Kate Miller, NVTA Executive Director.

This new infrastructure will save 1.35 million hours of vehicle delay a year, reducing carbon emissions by 94,000 tons over the next 20 years. That’s the equivalent of removing 22,372 cars from our roads for one year. The addition of a pedestrian and bicycle facility increases access for all road users. Construction on the $56 million project began in the summer of 2022, and Soscol Junction opened to traffic in the summer of 2024.

The new Highway 101/De La Cruz/Trimble Roadd project in San Jose, sponsored by VTA, was named Interchange Project winner at the CTF’s annual awards ceremony in Irvine, Calif., on June 12, 2025. Still, both agencies are honored to be recognized as one of the most impactful transportation projects in California.

More information: Soscol Junction Interchange.