California State Route 128
|Defined by Streets and Highways Code § 428|
|Maintained by Caltrans|
|Length||120.52 mi (193.96 km)|
|West end||SR 1 near Albion|
|East end||I-505 in Winters|
|Counties||Mendocino, Sonoma, Napa, Solano, Yolo|
State Route 128 (SR 128) is a state highway in the U.S. state of California, connecting the Mendocino coast to the Sacramento Valley, through the state's Wine Country. It runs from State Route 1 near Albion to Interstate 505 in Winters.
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 along Road 93A and Covell Blvd to Route 113 at Davis and then Mace Blvd to 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. 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; 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.
The main road through the Anderson Valley to the mouth of the Navarro River, and from there up the coast to Fort Bragg, was originally called the Navarro Highway; it follows the approximate route of the present Route 128 and Route 1 through Mendocino County. Even earlier, the road followed the Navarro Ridge, to the north of the present alignment, instead of staying at the river level. By 1938, the last stretches of old winding roadway near the present location of Navarro were replaced by a straighter alignment, taken over from a disused logging railway line.
Before being numbered as California State Route 128, the highway was signed as State Route 28. In 1952 it was renumbered State Route 128, permitting a different highway around Lake Tahoe to be numbered as Route 28 to coordinate its numbering with Nevada Route 28.
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 ( ). 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.
|||0.00||SR 1 – Mendocino, Fort Bragg, Point Arena||West end of SR 128|
|Boonville||29.58||SR 253 east – Ukiah|
|||||North Cloverdale Boulevard (US 101 Bus. south, SR 128 Bus. east) – Cloverdale||West end of US 101 Bus. overlap|
|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|
|Geyserville||||East end of freeway on US 101|
|US 101 south (Redwood Highway) / Canyon Road – San Francisco||Interchange; east end of US 101 overlap|
|||2.66||Tubbs Lane – Middletown, Lakeport|
|Calistoga||3.62||Petrified Forest Road – Santa Rosa|
|SR 29 north (Lincoln Avenue) – Lakeport, Downtown Calistoga||West end of SR 29 overlap|
|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|
|No major junctions|
|Winters||8.77||Railroad Avenue – Madison, Downtown Winters|
|||9.84||I-505 – Redding, Vacaville||Interchange; east end of SR 128|
|||9.84||CR E6 (Russell Boulevard) – Davis||Continuation beyond I-505|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
- California Department of Transportation (April 2008). "Log of Bridges on State Highways". Sacramento: California Department of Transportation.
- 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
- "Mendocino Coast Properties Map and Directions". Archived from the original on 2006-07-19. Retrieved 2007-12-14.
- Federal Highway Administration (March 25, 2015). National Highway System: California (North) (PDF) (Map). Scale not given. Washington, DC: Federal Highway Administration. Retrieved September 30, 2017.
- Natzke, Stefan; Neathery, Mike & Adderly, Kevin (June 20, 2012). "What is the National Highway System?". National Highway System. Washington, DC: Federal Highway Administration. Retrieved July 1, 2012.
- Levene, Bruce (1976), Mendocino County remembered: an oral history, Volume 1, Mendocino County American Bicentennial History Project, Mendocino County Historical Society, p. 39,
It was the main road over in those days. There was no road up the Navarro River. You had to go over the Navarro Ridge.
- "Narrow Stretch of Navarro Highway Being Improved", Healdsburg Tribune, Enterprise and Scimitar, California Digital Newspaper Collection, October 3, 1938.
- "California Highways (www.cahighways.org): Routes 121 through 128", California Highways, retrieved 2016-04-18; "California Highways (www.cahighways.org): Routes 25 through 32", California Highways, retrieved 2016-04-18
- California Department of Transportation. "State Truck Route List". Sacramento: California Department of Transportation. Archived from the original (XLS file) on June 30, 2015. Retrieved June 30, 2015.
- California Department of Transportation, All Traffic Volumes on CSHS, 2007
- California Department of Transportation, California Numbered Exit Uniform System, U.S. Route 101 Freeway Interchanges
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