California State Route 221

Route description

Route 221 is the northernmost part of the Napa-Vallejo Highway. It is a divided four-lane expressway that serves as an alternate to the nearby Route 29 freeway into Napa from the south. Unlike Route 29, however, 221 provides direct access to Napa Valley College and Napa State Hospital. The southern terminus is with Route 29 (which also carries Route 12), where it continues as the Napa-Vallejo Highway. The northern terminus is an intersection with Route 121, where 121 continues north as Soscol Avenue.

SR 221 is part of the National Highway System, a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration.

History

At SR 221's southern terminus with SR 12 / SR 29 and Soscol Ferry Road, the signalized intersection was reconstructed into a double roundabout interchange to relieve congestion. However, the direct connection from westbound SR 12 / northbound SR 29 to Soscol Ferry Road has been eliminated, though an alternate connection to Soscol Ferry is via Napa Valley Corporate Way. It opened in the fall of 2024, with full construction completed in 2025.

Major intersections

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References

References

1. {{FHWA NHS map
2. {{FHWA NHS
3. "Caltrans District 4 Current Projects - Soscol Junction". [[California Department of Transportation]].
4. (July 2007)
5. [[California Department of Transportation]], [https://traffic-counts.dot.ca.gov/ All Traffic Volumes on CSHS], 2005 and 2006