California State Route 12

State Route 12
State Route 12
	SR 12 highlighted in red
Route information
	Maintained by Caltrans
Length	140.64 mi (226.34 km)
Existed	1934–present
Tourist; routes	Valley of the Moon Highway between Santa Rosa and Agua Caliente
Major junctions
West end	SR 116 in Sebastopol
	US 101 in Santa Rosa; SR 121 from Schellville to Napa; SR 29 from Napa to east of Napa; I-80 in Fairfield; I-680 in Fairfield; SR 160 in Rio Vista; I-5 west of Lodi; SR 99 in Lodi; SR 88 from Lockeford to Clements; SR 26 from Valley Springs to east of Valley Springs;
East end	SR 49 in San Andreas
Location
Country	United States
State	California
Counties	Sonoma, Napa, Solano, Sacramento, San Joaquin, Calaveras
Highway system
	State highways in California; Interstate; US; State; Scenic; History; Pre‑1964; Unconstructed; Deleted; Freeways;

State Route 12 (SR 12) is a state highway in the U.S. state of California that travels in an east–west direction from SR 116 in Sebastopol in Sonoma County to SR 49 just north of San Andreas in Calaveras County. The route connects the Sonoma and Napa valleys with the Sacramento–San Joaquin River Delta and the Sierra Foothills. It is constructed to freeway standards from the Fulton Road/South Wright Road stoplight in Santa Rosa, to its partial interchange with Farmers Lane (also in Santa Rosa).