California State Route 29

"CA 29" redirects here. For the congressional district, see California's 29th congressional district.

State Route 29
Route information
Defined by S&HC § 329
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
Highway system
State highways in California List 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.

Route description

Route 29 in Vallejo

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.

The highway then runs as a two-lane road through the Napa Valley cities and towns of Yountville, Oakville, Rutherford, St. Helena, and Calistoga, while also passing many of the region's notable vineyards and wineries. This portion of the highway is often heavily congested with rental cars and tour buses in spring and summer, when tourists flock to Napa Valley from San Francisco.

North of Calistoga, SR 29 climbs Mount Saint Helena, an extinct volcano, at the border between Napa County and Lake County. The road then heads north to Middletown and Lower Lake before going around the southern and western sides of Clear Lake, the largest natural freshwater lake completely within California. In Lakeport, SR 29 becomes a freeway as it bypasses the city. It then reverts back as a two-lane highway before it terminates at Route 20 in Upper Lake.

Historically, the route between the Napa Valley and Middletown was served by the Old Bull Trail Road, built by volunteers in the 1850s that had grades up to 35 percent. That was replaced by the St. Helena Toll Road in 1868, which had more manageable inclines of up to 12 percent. The State of California purchased the toll road in 1925.

The points of interest along Route 29 include Bothe-Napa Valley State Park, Bale Grist Mill State Historic Park, Robert Louis Stevenson State Park, the St. Helena Toll Road and Bull Trail, the Stone House, and the Lower Lake Stone Jail.

Major intersections

Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, and do not necessarily reflect current mileage. R reflects a realignment in the route since then. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.

County	Location	Postmile	Exit	Destinations	Notes
Solano SOL 0.00-5.96	Vallejo	0.00		I-80 west / Maritime Academy Drive – California Maritime Academy	Interchange
		1.01		Lemon Street to I-680 / I-780
				Curtola Parkway to I-780 – Benicia
		2.07		Maine Street	Former SR 141
		2.82		Tennessee Street
		4.73		SR 37 to I-80 – San Rafael, Sacramento, San Francisco	Interchange
Napa NAP 0.00-48.58	American Canyon	0.69		American Canyon Road
		R2.77		Watson Lane, Green Island Road	Interchange
		4.71		SR 12 east (Jameson Canyon Road) / Airport Boulevard – Fairfield, Sacramento, Napa County Airport	South end of SR 12 overlap
		R6.20		SR 221 / Soscol Ferry Road – Downtown Napa, Lake Berryessa
		R8.66		SR 121 south / SR 12 west (Carneros Highway) – Sonoma	North end of SR 12 overlap; south end of SR 121 overlap
			South end of freeway
	Napa	10.31	16	SR 121 north (Imola Avenue) – Lake Berryessa	North end of SR 121 overlap
		11.55	18A	First Street – Downtown Napa
		12.04	18B	Lincoln Avenue
		13.06	19	Trancas Street, Redwood Road	Former SR 221
			North end of freeway
				Sierra Avenue	Interchange; northbound exit and entrance
	Yountville	19.03		California Drive – Yountville, Veterans Home	Interchange
	Rutherford	24.60		SR 128 east (Rutherford Road) – Lake Berryessa, Winters	South end of SR 128 overlap
	Calistoga	36.89		SR 128 west (Foothill Boulevard) – Geyserville	North end of SR 128 overlap
		39.50		Tubbs Lane – Santa Rosa, Geyserville
Lake LAK 0.00-52.54	Middletown	5.81		SR 175 (Main Street)
	Lower Lake	20.31		SR 53 north / Morgan Valley Road (Main Street) – Clearlake
		27.89		SR 281 (Soda Bay Road) / Red Hills Road – Soda Bay
		31.05		SR 175 east – Middletown	South end of SR 175 overlap
		R40.14		SR 175 west / South Main Street (SR 29 Bus. north), Soda Bay Road – Hopland	North end of SR 175 overlap
			South end of freeway
	Lakeport	R41.42	102	Lakeport Boulevard, Todd Road – Lakeport
		R42.68	103	11th Street, Scotts Valley Road – Lakeport
		R45.15	106	Hill Road, Park Way
		R47.85	108	Nice-Lucerne Cutoff (SR 29 Bus. south)
			North end of freeway
		52.54		SR 20 to US 101 – North Shore Resorts, Williams
Concurrency terminus       Closed/former       HOV only       Incomplete access       Tolled/ETC       Unopened

External links

• California @ AARoads - State Route 29
• Caltrans: Route 29 highway conditions
• California Highways: SR 29
• Cal-NExUS: Route 29 North
• Cal-NExUS: Route 29 South