California State Route 128

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State Route 128 marker

State Route 128
Route information
Defined by S&HC § 428
Maintained by Caltrans
Length: 120.52 mi[1] (193.96 km)
Major junctions
West end: SR 1 near Albion
  US 101 in Cloverdale
SR 29 in Calistoga
East end: I‑505 in Winters
Highway system
SR 127 SR 129

State Route 128 (SR 128) is a state highway in the U.S. state of California, connecting the Mendocino coast to the Central Valley through the state's Wine Country.

Route description[edit]

A relatively straight section of State Route 128 near Hendy Woods State Park.
Highway marker showing cosign of US 101 and California Route 128.

Route 128 begins at Route 1 near the mouth of the Navarro River at the Pacific Ocean. The highway travels upriver through the coast redwood forests of Navarro River Redwoods State Park and through the vineyards and apple orchards of the Anderson Valley to Boonville. Route 253 terminates into Route 128 at the south end of Boonville. Leaving Boonville, Route 128 climbs out of the Navarro River watershed and crosses the Yorkville Highlands before descending into the Russian River watershed, arriving at Cloverdale in the Alexander Valley, where the highway joins U.S. Route 101 heading south. A few miles later, at Geyserville, Route 128 separates from U.S. 101 and crosses Knights Valley on the way to Napa Valley, where it joins Route 29 at Calistoga. After passing through the town of St. Helena, Route 128 splits from Route 29 at Rutherford and climbs east over dry ridges above Lake Berryessa to the Sacramento Valley. In Winters, the route's constructed portion ends at Interstate 505. By its legal definition, the route continues 14 mi (23 km) east to Route 113 at Davis and Interstate 80, but this segment is currently not constructed.

The section of Route 128 through Navarro River Redwoods State Park is often closed in winter storms due to flooding.[2] Two slower alternate routes are available: the Philo-Greenwood road connects Route 1 near Elk to Route 128 near Hendy Woods State Park, a few miles north of Philo;[3] another alternate route is the Comptche-Ukiah Road, which intersects Route 1 just south of the town of Mendocino and runs inland to Comptche, and departs Comptche on Flynn Creek Road, intersecting Route 128 just up river from the seasonal flood gate closing the highway.

Major intersections[edit]

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, and T indicates postmiles classified as temporary.[4] The numbers reset at county lines; the start and end postmiles in each county are given in the county column.

County Location Postmile
[4][5][6]
Exit
[7]
Destinations Notes
Mendocino
MEN 0.00-50.90
  0.00 SR 1 – Mendocino, Fort Bragg, Point Arena
Boonville 29.58 SR 253 east – Ukiah
Sonoma
SON 0.00-24.76
    North Cloverdale Boulevard (US 101 Bus. south, SR 128 Bus. east) – Cloverdale West end of US 101 Bus. overlap
  L4.86
R53.40[N 1]
US 101 north (Redwood Highway) – Eureka Interchange; east end of US 101 Bus. overlap; west end of US 101 overlap
    West end of freeway on US 101
Cloverdale R51.62[N 1] 520 Citrus Fair Drive
  R50.43[N 1] 519 South Cloverdale Boulevard (US 101 Bus. north, SR 128 Bus. west)
  R49.05[N 1] 518 Dutcher Creek Road – Stewarts Point
  R47.85[N 1] 517 Asti
Geyserville   East end of freeway on US 101
43.37[N 1]
L4.86
US 101 south (Redwood Highway) / Canyon Road – San Francisco Interchange; east end of US 101 overlap
Napa
NAP 0.00-34.27
  2.66 Tubbs Lane – Middletown, Lakeport
Calistoga 3.62 Petrified Forest Road – Santa Rosa
4.55
36.89[N 2]
SR 29 north (Lincoln Avenue) – Lakeport, Downtown Calistoga West end of SR 29 overlap
Rutherford 24.60[N 2]
4.56
SR 29 south – Napa East end of SR 29 overlap
  7.37 Silverado Trail – St. Helena, Calistoga, Napa
  11.28 Chiles Pope Valley Road – Pope Valley
  23.90 SR 121 south (Monticello Road) – Napa
Solano
SOL 0.00-0.75
No major junctions
Yolo
YOL 0.00-9.84
Winters 8.77 Railroad Avenue – Madison, Downtown Winters
  9.84 I‑505 – Redding, Vacaville Interchange
  9.84 CR E6 (Russell Boulevard) – Davis Continuation beyond I-505
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
  1. ^ a b c d e f Indicates that the postmile represents the distance along US 101 rather than SR 128.
  2. ^ a b Indicates that the postmile represents the distance along SR 29 rather than SR 128.

History[edit]

California State Route 128 was originally signed as State Route 28. In 1952 it was renumbered State Route 128, permitting the route around Lake Tahoe to be numbered as Route 28 in coordination with Nevada Route 28.[1][2]

References[edit]

  1. ^ January 1, 2006 California Log of Bridges on State Highways
  2. ^ Florsheim, Joan L.; Mount, Jeffrey F.; Rutten, Luke T. (2000), "Effect of baselevel change on floodplain and fan sediment storage and ephemeral tributary channel morphology, Navarro River, California", Earth Surface Processes and Landforms 26 (2): 219–232, doi:10.1002/1096-9837(200102)26:2<219::AID-ESP169>3.0.CO;2-0 
  3. ^ Mendocino Coast Properties Map and Directions
  4. ^ a b Staff. "State Truck Route List" (XLS file). California Department of Transportation. Retrieved August 21, 2012. 
  5. ^ California Department of Transportation, Log of Bridges on State Highways, April 2008
  6. ^ California Department of Transportation, All Traffic Volumes on CSHS, 2007
  7. ^ California Department of Transportation, California Numbered Exit Uniform System, U.S. Route 101 Freeway Interchanges

External links[edit]