California State Route 221
|Defined by Streets and Highways Code § 521|
|Maintained by Caltrans|
|Length||2.682 mi (4.316 km)|
|South end||SR 12 / SR 29 near Napa|
|North end||SR 121 in Napa|
State Route 221 (SR 221) is a state highway in the U.S. state of California that runs in and just outside the City of Napa, providing access to Napa Valley College and Napa State Hospital. The highway's southern terminus is with State Route 12 and State Route 29 outside the southeast corner of the city, and its northern terminus is at State Route 121 inside the city. SR 221 forms part of the Napa-Vallejo Highway with SR 29.
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.
Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on the alignment that existed at the time, and do not necessarily reflect current mileage. R reflects a realignment in the route since then, M indicates a second realignment, L refers an overlap due to a correction or change, and T indicates postmiles classified as temporary ( ). Segments that remain unconstructed or have been relinquished to local control may be omitted. The entire route is in Napa County.
|||0.00||Soscol Ferry Road||Continuation beyond SR 12 / SR 29|
|||0.00||SR 12 / SR 29 – Sonoma, Calistoga, Vallejo, Oakland||South end of SR 221|
|Napa||2.68||SR 121 (Imola Avenue, Soscol Avenue) – Lake Berryessa, Sonoma, Downtown Napa||North end of SR 221|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
- California Department of Transportation. "State Truck Route List". Sacramento: California Department of Transportation. Archived from the original (XLS file) on June 30, 2015. Retrieved June 30, 2015.
- Federal Highway Administration (March 25, 2015). National Highway System: Napa, CA (PDF) (Map). Scale not given. Washington, DC: Federal Highway Administration. Retrieved September 9, 2017.
- Natzke, Stefan; Neathery, Mike & Adderly, Kevin (June 20, 2012). "What is the National Highway System?". National Highway System. Washington, DC: Federal Highway Administration. Retrieved July 1, 2012.
- California Department of Transportation (July 2007). "Log of Bridges on State Highways". Sacramento: California Department of Transportation.
- California Department of Transportation, All Traffic Volumes on CSHS, 2005 and 2006
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