California State Route 121

State Route 121 (SR 121) is a state highway in the U.S. state of California. It runs through the Wine Country region of Sonoma and Napa counties. Its southern terminus is at State Route 37 at Sears Point, and its northern terminus is at State Route 128 near Lake Berryessa. SR 121 passes through the Carneros region of the southern Sonoma Valley and Napa Valley.

State Route 121

Map of western California with SR 121 highlighted in red
Route information
Maintained by Caltrans
Length33.567 mi (54.021 km)
Major junctions
South end SR 37 at Sears Point
Major intersections
North end SR 128 near Lake Berryessa
Location
CountryUnited States
StateCalifornia
CountiesSonoma, Napa
Highway system
  • State highways in California
  • Interstate
  • US
  • State
  • Scenic
  • History
  • Preโ€‘1964
  • Unconstructed
  • Deleted
  • Freeways
โ† SR 120โ†’ SR 123
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