Highway 29 (California)

State Route 29
SR 29 highlighted in red
Route information
Defined by
Maintained by Caltrans
Length:	105.648 mi (170.024 km)
Existed:	1934 – present
Major junctions
South end:	I-80 in Vallejo
	SR 12 near Napa SR 128 in Calistoga SR 53 near Clearlake SR 175 near Lakeport
North end:	SR 20 at Upper Lake
Location
Counties:	Solano, Napa, Lake
Highway system
State highways in California Interstate U.S. State Pre-1964 History Unconstructed Deleted Freeway Scenic ← SR 28 SR 32 →

State Route 29 (SR 29) is a state highway in the U.S. state of California that travels from Interstate 80 in Vallejo north to State Route 20 in Upper Lake. It serves as the primary road through the Napa Valley, providing access to the Clear Lake region to the north and the rest of the San Francisco Bay Area to the south.

This route is part of the California Freeway and Expressway System south of the intersection of Oak Knoll Avenue (approximately 1 mile north of the Napa city limits), and is eligible for the State Scenic Highway System. However, it is not a scenic highway as defined by Caltrans.

SR 29 begins at Interstate 80 (I-80) just north of the Carquinez Bridge in Vallejo. After running through the downtown area of Vallejo, it travels as a four-lane expressway (on some segments, five) through American Canyon to Napa. It then briefly becomes a freeway as it passes through Napa.