California State Route 128

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 description

Route 128 is defined in section 428 of the California Streets and Highways Code. The definition omits the concurrencies with Route 101 and Route 29 instead of duplicating that segment in those other routes' definition in the code:

Route 128 is from: (a) Route 1 near the mouth of the Navarro River to Route 101 near Cloverdale. (b) Route 101 to Route 29 in Calistoga. (c) Route 29 near Rutherford to Route 113 near Davis via Sage Canyon.

Route 128 begins at Route 1 near the mouth of the Navarro River at the Pacific Ocean. The highway travels southeast and 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, from Ukiah, has its western terminus 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 continues southeast through 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 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.

SR 128 is part of the California Freeway and Expressway System, although it is mostly two lanes, but except for a small portion in Winters is not part of the National Highway System, a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration.

History The main road through the Anderson Valley to the mouth of the Navarro River, and from there up the coast to Fort Bragg, was previously called the Navarro Highway; it followed the approximate route of the present Route 128 and Route 1 through Mendocino County. In the early 1900s the part of the highway north of Mountain House Road was also known as "MacDonald-to-the-Sea", after the owner of the hotel there. 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 State Route 28.;

Major intersections

California State Route 128

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