page_title: California State Route 121
section_title: History
hierarchical_section_title: California State Route 121 / History
caption_attribution_description: English: The sign on Highway 37 for the Napa and Sonoma exit in Sears Point, California
context_page_description: State Route 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.
context_section_description: The section from SR 37 to SR 29 in Napa remains virtually unchanged since its definition in 1963. The northern section, however, was slightly altered since its definition the same year due to a realignment of various other freeways.
caption: A sign on Highway 37 directing drivers to SR 121
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