State Route 20 (California)
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State Route 20 (SR 20) is a
state highway A state highway, state road, or state route (and the equivalent provincial highway, provincial road, or provincial route) is usually a road that is either Route number, numbered or maintained by a sub-national state or province. A road numbered ...
in the northern-central region of the U.S. state of
California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...
, running east–west north of
Sacramento Sacramento ( or ; ; ) is the capital city of the U.S. state of California and the seat of Sacramento County. Located at the confluence of the Sacramento and American Rivers in Northern California's Sacramento Valley, Sacramento's 2020 p ...
from the
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to the
Sierra Nevada The Sierra Nevada ( ) is a mountain range in the Western United States, between the Central Valley of California and the Great Basin. The vast majority of the range lies in the state of California, although the Carson Range spur lies primari ...
. Its west end is at SR 1 in
Fort Bragg Fort Bragg (formerly Fort Liberty from 2023–2025) is a United States Army, U.S. Army Military base, military installation located in North Carolina. It ranks among the largest military bases in the world by population, with more than 52,000 m ...
, from where it heads east past Clear Lake, Colusa,
Yuba City Yuba City (Maidu: ''Yubu'') is a city in Northern California and the county seat of Sutter County, California, United States. The population was 70,117 at the 2020 census. Yuba City is the principal city of the Yuba City Metropolitan Statistical ...
, Marysville and Nevada City to
I-80 Interstate 80 (I-80) is an east–west transcontinental freeway that crosses the United States from San Francisco, California, to Teaneck, New Jersey, in the New York metropolitan area. The highway was designated in 1956 as one of the ori ...
near Emigrant Gap, where eastbound traffic can continue on other routes to
Lake Tahoe Lake Tahoe (; Washo language, Washo: ''dáʔaw'') is a Fresh water, freshwater lake in the Sierra Nevada of the Western United States, straddling the border between California and Nevada. Lying at above sea level, Lake Tahoe is the largest a ...
or
Nevada Nevada ( ; ) is a landlocked state in the Western United States. It borders Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. Nevada is the seventh-most extensive, th ...
. Portions of SR 20 are built near the routing of what was first a
wagon road ''Wagon Train'' is an American Western television series that aired for eight seasons, first on the NBC television network (1957–1962) and then on ABC (1962–1965). ''Wagon Train'' debuted on September 18, 1957, and reached the top of the N ...
and later a turnpike in the late 19th century. This road was extended through the state highway system all the way to Ukiah in the early 20th century, and the missing link near Clear Lake was completed in 1932 before the official designation of this highway as SR 20 in 1934. There have been subsequent improvements to the road, such as the conversion of the Grass Valley portion of the route to
freeway A controlled-access highway is a type of highway that has been designed for high-speed vehicular traffic, with all traffic flow—ingress and egress—regulated. Common English terms are freeway, motorway, and expressway. Other similar terms ...
standards.


Route description

State Route 20 begins at SR 1 in southern
Fort Bragg Fort Bragg (formerly Fort Liberty from 2023–2025) is a United States Army, U.S. Army Military base, military installation located in North Carolina. It ranks among the largest military bases in the world by population, with more than 52,000 m ...
, less than from the Pacific Ocean. It heads east, quickly climbing into the
Mendocino Range The Mendocino Range is one of several coastal mountain ranges which compose the Pacific Coast Ranges, Pacific Coast Range. This massive range of coastal mountains was formed during a period of coastal orogeny, millions of years ago. The Mendocino ...
along a ridge and crossing through Dunlap Pass. The highway continues to rise alongside the North Fork Big River and tributaries, crossing another summit and then descending to Willits in the Little Lake Valley via Broaddus Creek. An
overlap Overlap may refer to: * In set theory, an overlap of elements shared between sets is called an intersection, as in a Venn diagram. * In music theory, overlap is a synonym for reinterpretation of a chord at the boundary of two musical phrases * Ove ...
with
US 101 U.S. Route 101, or U.S. Highway 101 (US 101), is a major north–south highway that traverses the states of California, Oregon, and Washington on the West Coast of the United States. It is part of the United States Numbered Highway Syst ...
begins in Willits and heads southeasterly to Calpella, north of Ukiah in Redwood Valley. There SR 20 turns east again, crossing the Russian River, passing the north shore of Lake Mendocino, and rising to a summit via the East Fork Russian River and Cold Creek. The roadway again descends alongside the Blue Lakes and Scotts Creek to the junction with SR 29 and the settlement of Upper Lake in the Clear Lake Basin. SR 20 closely follows the northeast shore of Clear Lake, staying right above the water line to avoid the adjacent hills. Where the lake ends, SR 20 continues east, intersecting SR 53 and then following the North Fork Cache Creek and tributaries to the
Lake A lake is often a naturally occurring, relatively large and fixed body of water on or near the Earth's surface. It is localized in a basin or interconnected basins surrounded by dry land. Lakes lie completely on land and are separate from ...
Colusa county line. During its final descent into the
Sacramento Valley The Sacramento Valley is the area of the Central Valley of the U.S. state of California that lies north of the Sacramento–San Joaquin River Delta and is drained by the Sacramento River. It encompasses all or parts of ten Northern California ...
, SR 20 intersects SR 16 and curves north and back east, entering the valley via Salt Creek.
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street maps and
USGS The United States Geological Survey (USGS), founded as the Geological Survey, is an government agency, agency of the United States Department of the Interior, U.S. Department of the Interior whose work spans the disciplines of biology, geograp ...
topographic map In modern mapping, a topographic map or topographic sheet is a type of map characterized by large- scale detail and quantitative representation of relief features, usually using contour lines (connecting points of equal elevation), but histori ...
s, accessed January 2008 vi
ACME Mapper
/ref> Once it enters the flat Sacramento Valley, SR 20 takes a generally straight path, crossing I-5 in Williams, overlapping SR 45 near the west bank of the
Sacramento River The Sacramento River () is the principal river of Northern California in the United States and is the largest river in California. Rising in the Klamath Mountains, the river flows south for before reaching the Sacramento–San Joaquin River D ...
southeast from Colusa, and then turning back east to cross the Sacramento River and
Sutter Bypass The Sutter Basin is a area of the Sacramento Valley in the U.S. state of California, and is part of the Feather River drainage basin. The basin includes the Sutter Basin Fire Protection District of ~ and uses irrigation from the Thermalito Afterba ...
on its way to
Yuba City Yuba City (Maidu: ''Yubu'') is a city in Northern California and the county seat of Sutter County, California, United States. The population was 70,117 at the 2020 census. Yuba City is the principal city of the Yuba City Metropolitan Statistical ...
. The route crosses SR 99 west of central Yuba City, and runs east through northern Yuba City to the
Feather River The Feather River is the principal tributary of the Sacramento River, in the Sacramento Valley of Northern California. The river's main stem is about long. Its length to its most distant headwater tributary is just over . The main stem Feather ...
, which it crosses on the 10th Street Bridge into Marysville. Within the central part of that city, SR 20 makes several turns, first turning south from 10th Street onto E Street, then east on 9th Street (overlapping SR 70), north on B Street, and east on 12th Street (splitting from SR 70). The highway leaves Marysville to the northeast, paralleling the
Yuba River The Yuba River is a tributary of the Feather River in the Sierra Nevada and eastern Sacramento Valley, in the U.S. state of California. The main stem of the river is about long, and its headwaters are split into three major forks. The Yuba ...
on its north side as it enters the foothills of the
Sierra Nevada The Sierra Nevada ( ) is a mountain range in the Western United States, between the Central Valley of California and the Great Basin. The vast majority of the range lies in the state of California, although the Carson Range spur lies primari ...
. SR 20 rises into the Sierra along the north side of the Yuba River, crossing to the south side near Smartsville and then climbing through several ravines to the Penn Valley. The current alignment, built in the mid-1980s as a mostly
two-lane freeway A two-lane expressway or two-lane freeway is an expressway or freeway with only one lane in each direction, and usually no median barrier. It may be built that way because of constraints, or may be intended for expansion once traffic volumes ri ...
, continues east across rugged terrain to the city of Grass Valley, where it joins SR 49 on the Golden Center Freeway. The two routes travel northeast to Nevada City, where SR 49 turns northwest and SR 20 resumes its eastward course as a two-lane highway. The roadway climbs from Nevada City and follows Harmony Ridge and Washington Ridge before descending into the Bear Valley via a series of
hairpin turn A hairpin turn (also hairpin bend or hairpin corner) is a bend in a road with a very acute inner angle, making it necessary for an oncoming vehicle to turn about 180° to continue on the road. It is named for its resemblance to a bent metal ha ...
s, and then climbing, just north of Emigrant Gap, to its end at
I-80 Interstate 80 (I-80) is an east–west transcontinental freeway that crosses the United States from San Francisco, California, to Teaneck, New Jersey, in the New York metropolitan area. The highway was designated in 1956 as one of the ori ...
at
Yuba Pass Yuba Pass is a mountain pass on State Route 49 in Sierra County in the U.S. state of California. The pass lies at an elevation of about 3.4 air miles west of Sattley, on the divide between the North Yuba River and the Middle Fork Feather Riv ...
. The Pioneer Trail, a
National Recreation Trail The National Trails System is a series of trails in the United States designated "to promote the preservation of, public access to, travel within, and enjoyment and appreciation of the open-air, outdoor areas and historic resources of the Nati ...
, parallels SR 20 from a point on Harmony Ridge to the Bear Valley, and includes parts of a branch of the
California Trail The California Trail was an emigrant trail of about across the western half of the North American continent from Missouri River towns to what is now the state of California. After it was established, the first half of the California Trail f ...
first used in 1850. SR 20 east of US 101 is part of the
California Freeway and Expressway System The California Freeway and Expressway System is a system of existing or planned freeways and expressways in the U.S. state of California. It encompasses both state highways and federal highways in California. It was defined by Article 2 (comme ...
, although it is mostly a two-lane surface road; west of SR 29 and east of SR 53, it is 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 The Federal Highway Administration (FHWA) is a division of the United States Department of Transportation that specializes in highway transportation. The agency's major activities are grouped into two programs, the Federal-aid Highway Program a ...
. All of SR 20 is on the Interregional Road System, a highway system that connects major economic centers of the state,
California State Legislature The California State Legislature is the bicameral state legislature of the U.S. state of California, consisting of the California State Assembly (lower house with 80 members) and the California State Senate (upper house with 40 members). ...

CA Codes (shc:163-164.56)
, accessed March 2008
and has been selected by the
California Department of Transportation The California Department of Transportation (Caltrans) is an Executive (government), executive department of the U.S. state of California. The department is part of the Government of California#State agencies, cabinet-level California State Tran ...
(Caltrans) as a High Emphasis Route and Focus Route from US 101 to SR 29 and SR 53 to I-80, with the designated corridor following SR 29 and SR 53 around the south side of Clear Lake. It is also eligible for the State Scenic Highway System from SR 1 to SR 16 and SR 49 to I-80, and has been designated as such for near the east end; this is part of the federally designated Yuba-Donner Scenic Byway, a
National Forest Scenic Byway The National Forest Scenic Byways are roads that have been designated by the U.S. Forest Service as scenic byways. Many are also National Scenic Byways (NSB). The program was initiated in 1987. List The following roadways were listed by the Fede ...
that uses SR 20 east of SR 49.


History

The east end of SR 20, from Bear Valley (just below Emigrant Gap) to Nevada City, closely follows a branch of the Truckee Route of the California Trail, first used by California-bound emigrants in 1850.
U.S. Forest Service The United States Forest Service (USFS) is an agency within the U.S. Department of Agriculture. It administers the nation's 154 national forests and 20 national grasslands covering of land. The major divisions of the agency are the Chief's ...

Pioneer Trail
revised May 2006
Later a turnpike was built here by the same company that opened the Pacific Turnpike (Culbertson Road and Bowman Lake Road between Dutch Flat and Bowman Lake) in 1864. California Highways and Public Works: Centennial Edition, September 9, 1950, p. 64 By the end of the 1910s, a passable
dirt Dirt is any matter considered unclean, especially when in contact with a person's clothes, skin, or possessions. In such cases, they are said to become dirty. Common types of dirt include: * Debris: scattered pieces of waste or remains * Du ...
and
gravel road A gravel road is a type of unpaved road surfaced with gravel that has been brought to the site from a quarry or stream bed. Gravel roads are common in less-developed nations, and also in the rural areas of developed nations such as Canada and ...
connected Ukiah and Nevada City via the south side of Clear Lake and Marysville. The portion between Lower Lake and Wilbur Springs was impassable in wet weather, at which times the Bartlett Springs and Bear Valley Toll-road via Upper Lake and Bartlett Springs was available for $1.50 each way or $2.50 round trip. This route generally followed the present SR 20, except around Clear Lake and between Marysville and Rough and Ready (where it used Spenceville Road). Beyond Nevada City to Emigrant Gap, the old turnpike was not passable; instead the present SR 174 was available for eastward drivers. Between Williams and Colusa, the road was paved in
concrete Concrete is a composite material composed of aggregate bound together with a fluid cement that cures to a solid over time. It is the second-most-used substance (after water), the most–widely used building material, and the most-manufactur ...
, as it had been added to the state highway system as part of the first (1910)
bond issue In finance, a bond is a type of security under which the issuer (debtor) owes the holder (creditor) a debt, and is obliged – depending on the terms – to provide cash flow to the creditor (e.g. repay the principal (i.e. amount borrowed) of t ...
, specifically as Route 15, connecting the west Sacramento Valley trunk ( Route 7, now I-5) with the
county seat A county seat is an administrative center, seat of government, or capital city of a county or parish (administrative division), civil parish. The term is in use in five countries: Canada, China, Hungary, Romania, and the United States. An equiva ...
of Colusa. This state highway was significantly extended in both directions in 1919, west to Ukiah and east to Emigrant Gap,Howe & Peters
Engineers' Report to California State Automobile Association Covering the Work of the California Highway Commission for the Period 1911–1920
pp. 11-16
creating what was known as the Tahoe-Ukiah Highway, connecting Ukiah and
Lake Tahoe Lake Tahoe (; Washo language, Washo: ''dáʔaw'') is a Fresh water, freshwater lake in the Sierra Nevada of the Western United States, straddling the border between California and Nevada. Lying at above sea level, Lake Tahoe is the largest a ...
in combination with Route 37 (now I-80) and Route 38 (now SR 89).Ben Blow, California Highways: A Descriptive Record of Road Development by the State and by Such Counties as Have Paved Highways, 1920
Archive.org
o
Google Books
, pp. 104-105
The law that defined the extension simply stated that it would connect "Ukiah to Tahoe City"; the state decided in September 1925 that it would run the highway along the north shore of Clear Lake, combining with the planned Rumsey-Lower Lake Highway ( Route 50, now SR 53 and SR 16) east to Wilbur Springs. With the completion of this segment in mid-1932, the highway was ready for heavy travel, and became Sign Route 20 in 1934 as part of the initial signed state route system. In 1953, the legislature added an extension of Route 15 from US 101 at Willits (north of Ukiah) west to SR 1 near Fort Bragg. This was constructed (over an existing
county road A county highway (also county road or county route; usually abbreviated CH or CR) is a road in the United States and in the Canadian province of Ontario that is designated and/or maintained by the county highway department. Route numbering can ...
) and became part of Sign Route 20 prior to 1964,H.M. Gousha Company, California, 1963 when the Route 20 designation was legislatively adopted.: "Route 20 is from: (a) Route 1 near Fort Bragg to Route 101 at Willits. (b) Route 101 to Route 80 near Emigrant Gap via Williams and Colusa." Subsequent improvements include the construction of the Golden Center Freeway, connecting Grass Valley with Nevada City, in the late 1960s, and a new alignment of SR 20 west from Grass Valley, bypassing Rough and Ready, in the mid-1980s.


Major intersections


Williams business loop

State Route 20 Business (SR 20 Bus.) is a
business route A business route (or business loop, business spur, or city route) in the United States is a short special route that branches off a parent numbered highway at its beginning, continues through the central business district of a nearby city or to ...
of California State Route 20 in Williams. It provides access to downtown Williams as E Street and Husted Road. The business route follows the original routing of SR 20 from its western terminus to
Interstate 5 Interstate 5 (I-5) is the main north–south Interstate Highway System, Interstate Highway on the West Coast of the United States, running largely parallel to the Pacific coast of the contiguous U.S. from Mexico to Canada. It travels thro ...
. East of I-5, the original routing, which headed northeast out of Williams, has since been abandoned. The present-day route continues on E Street east to Husted Road, then turns north to the business route's eastern terminus at SR 20 at the northeastern tip of Williams. ;Major intersections


See also

*


References


External links


California @ AARoads - California 20


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