California State Route 29

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

State Route 29 marker

State Route 29
Route information
Defined by S&HC § 329
Maintained by Caltrans
Length: 105.648 mi[1] (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
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[edit]

Route 29 in Vallejo

This route is part of the California Freeway and Expressway System[2] 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.[3] However, it is not a scenic highway as defined by Caltrans.[4]

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 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[edit]

Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on the alignment that existed at the time, and do not necessarily reflect current mileage. R reflects a realignment in the route since then, M indicates a second realignment, L refers an overlap due to a correction or change, and T indicates postmiles classified as temporary (for a full list of prefixes, see the list of postmile definitions).[1] Segments that remain unconstructed or have been relinquished to local control may be omitted. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.

County Location Postmile
[1][5][6]
Exit
[7]
Destinations Notes
Solano
SOL 0.00-5.96
Vallejo 0.00 I‑80 west / Maritime Academy Drive – California Maritime Academy Interchange; south end of SR 29
1.01 I-680 (CA).svgI-780 (CA).svg Lemon Street to I-680 / I-780
  I-780 (CA).svg Curtola Parkway to I-780Benicia
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 North end of SR 29
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

References[edit]

External links[edit]

Route map: Google / Bing