California State Route 99 Business (Merced)
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State Route 99 (SR 99), commonly known as Highway 99 or, simply, as 99 (without any further designation), is a north–south
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 ''numbered'' or ''maintained'' by a sub-national state or province. A road numbered by a ...
in the U.S. state of
California California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territori ...
, stretching almost the entire length of the Central Valley. From its southern end at Interstate 5 (I-5) near
Wheeler Ridge Wheeler Ridge is an unincorporated area, unincorporated community in the southwestern San Joaquin Valley, within Kern County, California, Kern County, California. It is at the junction of the valley floor and the Wheeler Ridge landform of the Te ...
to its northern end at SR 36 near
Red Bluff Red Bluff(s) may refer to several places in North America: Places Canada *Red Bluff, British Columbia, a community near Quesnel, British Columbia, Canada ** Red Bluff First Nation, a First Nations band government headquartered near Quesnel, ...
, SR 99 goes through the densely populated eastern parts of the valley. Cities served include
Bakersfield Bakersfield is a city in Kern County, California, United States. It is the county seat and largest city of Kern County. The city covers about near the southern end of the San Joaquin Valley and the Central Valley region. Bakersfield's populat ...
,
Delano Delano or DeLano may refer to: Places in the United States * Delano, California * Delano, Wichita, Kansas, a neighborhood in Wichita and former community before merging with Wichita * Delano, Minnesota * Delano, Nevada * Delano, Pennsylvania * De ...
, Tulare,
Visalia Visalia ( ) is a city in the agricultural San Joaquin Valley of California. The population was 141,384 as per the 2020 census. Visalia is the fifth-largest city in the San Joaquin Valley, the 42nd most populous in California, and 192nd in ...
, Kingsburg,
Selma Selma may refer to: Places *Selma, Algeria *Selma, Nova Scotia, Canada *Selma, Switzerland, village in the Grisons United States: *Selma, Alabama, city in Dallas County, best known for the Selma to Montgomery marches *Selma, Arkansas *Selma, Cali ...
,
Fresno Fresno () is a major city in the San Joaquin Valley of California, United States. It is the county seat of Fresno County and the largest city in the greater Central Valley region. It covers about and had a population of 542,107 in 2020, maki ...
, Madera,
Merced Merced (; Spanish for "Mercy") is a city in, and the county seat of, Merced County, California, United States, in the San Joaquin Valley. As of the 2020 Census, the city had a population of 86,333, up from 78,958 in 2010. Incorporated on April 1 ...
,
Turlock Turlock is a city in Stanislaus County, California, United States. Its estimated 2019 population of 73,631 made it the second-largest city in Stanislaus County after Modesto. History Founded on December 22, 1871, by prominent grain farmer Jo ...
,
Modesto Modesto () is the county seat and largest city of Stanislaus County, California, United States. With a population of 218,464 at the 2020 census, it is the 19th largest city in the state of California and forms part of the Sacramento-Stockton- ...
, Manteca, Stockton,
Sacramento ) , image_map = Sacramento County California Incorporated and Unincorporated areas Sacramento Highlighted.svg , mapsize = 250x200px , map_caption = Location within Sacramento ...
,
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 ...
, and Chico. The highway is a remnant of the former Mexico to Canada U.S. Route 99 (US 99), which was decommissioned in 1972 after being functionally replaced by I-5 for long-distance traffic south of Sacramento. The entire segment from Wheeler Ridge to Sacramento has been upgraded as of January 2016 to a freeway at least four lanes wide, and the
California Department of Transportation The California Department of Transportation (Caltrans) is an executive department of the U.S. state of California. The department is part of the cabinet-level California State Transportation Agency (CalSTA). Caltrans is headquartered in Sacrame ...
(Caltrans) plans to further upgrade the segment to a minimum width of six lanes and also bring it into compliance with
Interstate Highway standards Standards for Interstate Highways in the United States are defined by the American Association of State Highway and Transportation Officials (AASHTO) in the publication ''A Policy on Design Standards: Interstate System''. For a certain highway to ...
as a parallel route to I-5 for
Los Angeles Los Angeles ( ; es, Los Ángeles, link=no , ), often referred to by its initials L.A., is the largest city in the state of California and the second most populous city in the United States after New York City, as well as one of the world' ...
–Sacramento traffic, with plans for it to eventually become either I-7 or I-9. North of Sacramento, the road ranges from a rural two-lane road to a four-lane freeway, with much of it following the route formerly designated as US 99E.


Route description

SR 99 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 is defined by Article 2 (commenci ...
, and except for a small portion north of SR 20 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 ...
.


Wheeler Ridge to Sacramento

From its southern terminus at
I-5 Interstate 5 (I-5) is the main north–south 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 through the states of Californi ...
in
Wheeler Ridge Wheeler Ridge is an unincorporated area, unincorporated community in the southwestern San Joaquin Valley, within Kern County, California, Kern County, California. It is at the junction of the valley floor and the Wheeler Ridge landform of the Te ...
(
Wheeler Ridge Interchange The Wheeler Ridge Interchange is a freeway interchange near Wheeler Ridge, California, Wheeler Ridge, California, where California State Route 99, State Route 99 (SR 99) merges with Interstate 5 in California, Interstate 5 (I-5). L ...
) to
Sacramento ) , image_map = Sacramento County California Incorporated and Unincorporated areas Sacramento Highlighted.svg , mapsize = 250x200px , map_caption = Location within Sacramento ...
, SR 99 passes through the major cities of the
San Joaquin Valley The San Joaquin Valley ( ; es, Valle de San Joaquín) is the area of the Central Valley of the U.S. state of California that lies south of the Sacramento–San Joaquin River Delta and is drained by the San Joaquin River. It comprises seven c ...
, including
Bakersfield Bakersfield is a city in Kern County, California, United States. It is the county seat and largest city of Kern County. The city covers about near the southern end of the San Joaquin Valley and the Central Valley region. Bakersfield's populat ...
,
Delano Delano or DeLano may refer to: Places in the United States * Delano, California * Delano, Wichita, Kansas, a neighborhood in Wichita and former community before merging with Wichita * Delano, Minnesota * Delano, Nevada * Delano, Pennsylvania * De ...
, Tulare,
Visalia Visalia ( ) is a city in the agricultural San Joaquin Valley of California. The population was 141,384 as per the 2020 census. Visalia is the fifth-largest city in the San Joaquin Valley, the 42nd most populous in California, and 192nd in ...
,
Fresno Fresno () is a major city in the San Joaquin Valley of California, United States. It is the county seat of Fresno County and the largest city in the greater Central Valley region. It covers about and had a population of 542,107 in 2020, maki ...
, Madera,
Merced Merced (; Spanish for "Mercy") is a city in, and the county seat of, Merced County, California, United States, in the San Joaquin Valley. As of the 2020 Census, the city had a population of 86,333, up from 78,958 in 2010. Incorporated on April 1 ...
,
Modesto Modesto () is the county seat and largest city of Stanislaus County, California, United States. With a population of 218,464 at the 2020 census, it is the 19th largest city in the state of California and forms part of the Sacramento-Stockton- ...
, and Stockton. The entirety of this segment is now built to freeway standards with complete access control, although some older portions are not yet in compliance with
Interstate Highway standards Standards for Interstate Highways in the United States are defined by the American Association of State Highway and Transportation Officials (AASHTO) in the publication ''A Policy on Design Standards: Interstate System''. For a certain highway to ...
. The portion of the highway between Fresno and Madera has been designated the 100th Infantry Battalion Memorial Highway, honoring the U.S. Army unit that was composed almost entirely with American soldiers of Japanese ancestry when it fought during
World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...
. The freeway sections connect and serve the agriculture and industry of the
California Central Valley The Central Valley is a broad, elongated, flat valley that dominates the interior of California. It is wide and runs approximately from north-northwest to south-southeast, inland from and parallel to the Pacific coast of the state. It covers ...
, connecting agricultural production with processing and packing businesses. Most of the freeway also parallels the Union Pacific's Fresno Subdivision. The portion between Salida and Manteca is designated the 442nd Regimental Combat Team Memorial Highway, honoring the US Army infantry regiment that, like the 100th Infantry Battalion, was also composed almost entirely of American soldiers of Japanese ancestry during World War II. In Sacramento, SR 99 first joins with I-80 Business as part of the Capital City Freeway, then runs concurrently with I-5. These SR 99 concurrences are not officially designated by Caltrans, but mapmakers often show it as such. SR 99 signage had existed along that route for motorists' convenience along with I-80, but was removed in 2000 on I-5, 2016 on I-80, and replaced by "TO SR 99" signs instead.


North Sacramento to Red Bluff

SR 99 then splits from I-5 in northern Sacramento, and then heads along the eastern side of the
Sacramento Valley , photo =Sacramento Riverfront.jpg , photo_caption= Sacramento , map_image=Map california central valley.jpg , map_caption= The Central Valley of California , location = California, United States , coordinates = , boundaries = Sierra Nevada (ea ...
through
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 ...
, and Chico to its northern terminus at SR 36 near
Red Bluff Red Bluff(s) may refer to several places in North America: Places Canada *Red Bluff, British Columbia, a community near Quesnel, British Columbia, Canada ** Red Bluff First Nation, a First Nations band government headquartered near Quesnel, ...
. SR 99 remains a four-lane freeway as the route leaves Sacramento County, but shortly reverts to a four-lane divided expressway as the highway crosses into Sutter County. As SR 99 reaches the junction of SR 70, the route turns northwest by north and becomes an undivided expressway with the exceptions of crossing 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 R ...
near
Nicolaus Nicolaus is a masculine given name. It is a Latin, Greek and German form of Nicholas. Nicolaus may refer to: In science: * Nicolaus Copernicus, Polish astronomer who provided the first modern formulation of a heliocentric theory of the solar syst ...
and the interchange with SR 113, where the route then turns straight north to Yuba City. As SR 99 crosses SR 20 at a signaled intersection, the highway becomes a four-lane freeway for before reverting to a two-lane road, passing the smaller towns of
Live Oak Live oak or evergreen oak is any of a number of oaks in several different sections of the genus ''Quercus'' that share the characteristic of evergreen foliage. These oaks are not more closely related to each other than they are to other oaks. ...
, Fagan, and Gridley. SR 99 briefly is a local four-lane road through Gridley before continuing as a two-lane highway. SR 99 passes by the western side of the
Thermalito Afterbay Thermalito (Spanish for "Small Thermal") is a census-designated place (CDP) in Butte County, California, United States. The population was 6,646 at the 2010 census, up from 6,045 at the 2000 census. The area is generally considered an integral par ...
. SR 162 joins SR 99 for before splitting off east towards the northern end of the Thermalito Afterbay. SR 99 then transitions from a two-lane road to a four-lane divided expressway just before the interchange at SR 149 turning northwest and eventually a freeway entering the Chico city limits. As SR 99 leaves Chico, the highway reverts to a 2-lane road before crossing into
Tehama County Tehama County ( ; Wintun for "high water") is a county located in the northern part of the U.S. state of California. As of the 2020 census, the population was 65,829. The county seat and largest city is Red Bluff. Tehama County comprises th ...
and passing through rural areas and the town of Los Molinos. The route then curves to the west and terminates at the junction with SR 36, approximately from I-5 in Red Bluff. This part of the highway is not planned to be I-7/I-9.


History


From initial construction to U.S. Route 99

The first state highway
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 repay the principal (i.e. amount borrowed) of the bond at the maturity date as well as i ...
, approved by the state's voters in 1910,"An act authorizing the construction, acquisition, maintenance and control of a system of state highways in the State of California...", approved March 22, 1909, chapter 383, p. 647 included a north–south highway through the central part of the state consisting of Route 3 through the
Sacramento Valley , photo =Sacramento Riverfront.jpg , photo_caption= Sacramento , map_image=Map california central valley.jpg , map_caption= The Central Valley of California , location = California, United States , coordinates = , boundaries = Sierra Nevada (ea ...
from the
Oregon Oregon () is a U.S. state, state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington (state), Washington, while the Snake River delineates much of it ...
state line south to
Sacramento ) , image_map = Sacramento County California Incorporated and Unincorporated areas Sacramento Highlighted.svg , mapsize = 250x200px , map_caption = Location within Sacramento ...
, replacing the
Siskiyou Trail The Siskiyou Trail stretched from California's Central Valley to Oregon's Willamette Valley; modern-day Interstate 5 follows this pioneer path. Originally based on existing Native American foot trails winding their way through river valleys, t ...
, and Route 4 through the
San Joaquin Valley The San Joaquin Valley ( ; es, Valle de San Joaquín) is the area of the Central Valley of the U.S. state of California that lies south of the Sacramento–San Joaquin River Delta and is drained by the San Joaquin River. It comprises seven c ...
from Sacramento to
Los Angeles Los Angeles ( ; es, Los Ángeles, link=no , ), often referred to by its initials L.A., is the largest city in the state of California and the second most populous city in the United States after New York City, as well as one of the world' ...
. In addition, a second route followed the west side of the Sacramento Valley, using Route 7 from
Red Bluff Red Bluff(s) may refer to several places in North America: Places Canada *Red Bluff, British Columbia, a community near Quesnel, British Columbia, Canada ** Red Bluff First Nation, a First Nations band government headquartered near Quesnel, ...
south to
Davis Davis may refer to: Places Antarctica * Mount Davis (Antarctica) * Davis Island (Palmer Archipelago) * Davis Valley, Queen Elizabeth Land Canada * Davis, Saskatchewan, an unincorporated community * Davis Strait, between Nunavut and Gre ...
and the short Route 8 east along the proposed
Yolo Causeway The Yolo Causeway is a long elevated highway viaduct on Interstate 80 that crosses the Yolo Bypass floodplain, connecting the cities of West Sacramento, California and Davis, California. It is officially named the Blecher-Freeman Memorial Caus ...
to Sacramento. North of
Bakersfield Bakersfield is a city in Kern County, California, United States. It is the county seat and largest city of Kern County. The city covers about near the southern end of the San Joaquin Valley and the Central Valley region. Bakersfield's populat ...
these closely paralleled some of the main lines of the
Southern Pacific Railroad The Southern Pacific (or Espee from the railroad initials- SP) was an American Class I railroad network that existed from 1865 to 1996 and operated largely in the Western United States. The system was operated by various companies under the ...
, including the Fresno Line, East and West Valley lines, Shasta Line and Siskiyou Line. By 1920 paving of both routes from Red Bluff to Los Angeles was completed or in progress, including the only mountain crossing south of Red Bluff, the
Ridge Route The Ridge Route, officially the Castaic–Tejon Route, was a two-lane highway between Los Angeles County and Kern County, California. Opened in 1915 and paved with concrete between 1917 and 1921, the road was the first paved highway directly ...
just north of Los Angeles. To the north of Red Bluff, the road was being graded but had not yet been paved over the
Siskiyou Mountains The Siskiyou Mountains are a coastal subrange of the Klamath Mountains, and located in northwestern California and southwestern Oregon in the United States. They extend in an arc for approximately from east of Crescent City, California, northea ...
into Oregon. Paving was finally completed in mid-1933, when a new alignment (now SR 263) opened through the Shasta River Canyon. The route from Davis to Oregon via Routes 7 and 3 came to be known as part of the Pacific Highway, an
auto trail The system of auto trails was an informal network of marked routes that existed in the United States and Canada in the early part of the 20th century. Marked with colored bands on utility poles, the trails were intended to help travellers in ...
organized in 1910 to connect Canada and Mexico. The split in the Sacramento Valley was known as the East and West Side highways (the latter also carrying the Pacific Highway). South of Sacramento Route 4 was the Valley Route, but the San Joaquin Valley Tourist and Travel Association held a contest to rename it, selecting Golden State Highway as the winning entry in July 1927. To this day, "Golden State Highway" is SR 99's default name in areas not given other names by the Legislature, and the name continues from its end at Wheeler Ridge on I-5 as the Golden State Freeway from there to
downtown Los Angeles Downtown Los Angeles (DTLA) contains the central business district of Los Angeles. In addition, it contains a diverse residential area of some 85,000 people, and covers . A 2013 study found that the district is home to over 500,000 jobs. It is ...
. This north–south central highway became part of US 99 in 1926, as part of the new
United States Numbered Highway System The United States Numbered Highway System (often called U.S. Routes or U.S. Highways) is an integrated network of roads and highways numbered within a nationwide grid in the contiguous United States. As the designation and numbering of these hi ...
developed by the
American Association of State Highway Officials The American Association of State Highway and Transportation Officials (AASHTO) is a standards setting body which publishes specifications, test protocols, and guidelines that are used in highway design and construction throughout the United St ...
(AASHO), though signs were not posted in California until 1928. US 99 also continued southeast from Los Angeles along a paved state highway, Route 9 and 26, to US 80 in
El Centro El Centro (Spanish for "The Center") is a city and county seat of Imperial County, California, United States. El Centro is the largest city in the Imperial Valley, the east anchor of the Southern California Border Region, and the core urban are ...
. The paved
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 (United States), county highway departme ...
south from El Centro to the
Mexican border Mexico shares international borders with three nations: *To the north the United States–Mexico border, which extends for a length of through the states of Baja California, Sonora, Chihuahua, Coahuila, Nuevo León and Tamaulipas. *To the south ...
became a state highway in mid-1931, and part of US 99 in mid-1932. In mid-1929, AASHO approved a split designation between Sacramento and Red Bluff, with US 99W replacing the original western route via Davis, and US 99E following the East Side Highway (Route 3) via Roseville. A short-lived split also existed between Manteca and Stockton in the early 1930s, with US 99E becoming the main route and US 99W becoming an extended SR 120 where not
concurrent Concurrent means happening at the same time. Concurrency, concurrent, or concurrence may refer to: Law * Concurrence, in jurisprudence, the need to prove both ''actus reus'' and ''mens rea'' * Concurring opinion (also called a "concurrence"), a ...
with US 50. A third highway heading north from Sacramento was constructed by the Natomas Company in the 1910s for along the
Sacramento River The Sacramento River ( es, Río Sacramento) 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–S ...
levee to provide access to land reclaimed and sold by the company.
Sacramento ) , image_map = Sacramento County California Incorporated and Unincorporated areas Sacramento Highlighted.svg , mapsize = 250x200px , map_caption = Location within Sacramento ...
and Sutter counties continued the road alongside the Sacramento River and
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 R ...
to
Nicolaus Nicolaus is a masculine given name. It is a Latin, Greek and German form of Nicholas. Nicolaus may refer to: In science: * Nicolaus Copernicus, Polish astronomer who provided the first modern formulation of a heliocentric theory of the solar syst ...
, where an existing county road crossed the river on a
drawbridge A drawbridge or draw-bridge is a type of moveable bridge typically at the entrance to a castle or tower surrounded by a moat. In some forms of English, including American English, the word ''drawbridge'' commonly refers to all types of moveable ...
and ran north to the East Side Highway at
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 ...
. This continuous roadway between Sacramento and Yuba City was dedicated in October 1924 as the Garden Highway. Parts of the present SR 99 alignment between Sacramento and Yuba City were added to the state highway system in 1933, when the legislature added Route 87 ( Sign Route 24, later US 40 Alternate) from
Woodland A woodland () is, in the broad sense, land covered with trees, or in a narrow sense, synonymous with wood (or in the U.S., the ''plurale tantum'' woods), a low-density forest forming open habitats with plenty of sunlight and limited shade (see ...
north past Yuba City to northwest of Oroville, and in 1949, with the creation of Route 232 (later Sign Route 24) between Sacramento and Marysville. The final piece became Route 245 (no signed number) in 1959, connecting Route 232 near Catlett with Route 87 near Tudor, and following the old Garden Highway across the Feather River to a point east of Tudor. Despite this combined route connecting the same cities as the Garden Highway, the only other piece of the old county road taken for the state highway was a short segment just north of Sacramento, carrying Route 232 between Jibboom Street and El Centro Road.


As a state route

When the
Interstate Highway System The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, is a network of controlled-access highways that forms part of the National Highway System in the United States. Th ...
was being planned in the 1950s, there were two proposals as to which way to route a freeway through the San Joaquin Valley. One was to upgrade US 99 to Interstate standards. The other proposed alternative was the West Side Freeway, which would bypass all the Central Valley communities and thus provide a faster and more direct north–south route through the state. The latter route was eventually chosen and ultimately became Interstate 5. The implementation of the Interstate Highway System and the mid- 1964 state highway renumbering ultimately sealed the fate of the U.S. Highway designation on US 99. The Interstates eventually replaced portions of US 99, causing it to be truncated at both of its ends. Since the remnant did not cross state lines, it was not allowed to keep its U.S. Highway status. US 99 was truncated to Los Angeles, with the old route south to Mexico becoming mainly
I-10 Interstate 10 (I-10) is the southernmost cross-country highway in the American Interstate Highway System. I-10 is the fourth-longest Interstate in the United States at , following I-90, I-80, and I-40. This freeway is part of the originally pl ...
and SR 86. At the same time Route 99 was defined legislatively to run from I-5 near
Wheeler Ridge Wheeler Ridge is an unincorporated area, unincorporated community in the southwestern San Joaquin Valley, within Kern County, California, Kern County, California. It is at the junction of the valley floor and the Wheeler Ridge landform of the Te ...
to
Red Bluff Red Bluff(s) may refer to several places in North America: Places Canada *Red Bluff, British Columbia, a community near Quesnel, British Columbia, Canada ** Red Bluff First Nation, a First Nations band government headquartered near Quesnel, ...
, but it was only marked as SR 99 between Sacramento and Yuba City, since the remainder was still US 99 or US 99E. The southern end of US 99 was moved further north to Sacramento in late 1966 and SR 99 was extended to Wheeler Ridge; the rest of former US 99 to Los Angeles was either I-5 or the locally maintained
San Fernando Road San Fernando Road is a major street in the City of Los Angeles and Los Angeles County. Within the Burbank city limits it is signed as San Fernando Boulevard, and north of Newhall Pass it is signed as The Old Road. It was previously designated ...
. Several years later US 99 and its branches were removed altogether from California, making SR 99 signage match the legislative definition; all of US 99W, and US 99 north of Red Bluff, remained as other routes (
I-80 Interstate 80 (I-80) is an east–west transcontinental freeway that crosses the United States from downtown San Francisco, California, to Teaneck, New Jersey, in the New York metropolitan area. The highway was designated in 1956 as one o ...
, SR 113, and I-5), while US 99E between Roseville and Marysville became SR 65. By 1968, all US 99 signs were removed or replaced with SR 99 signs following the completion of I-5. During the 20th century, Caltrans gradually widened Route 99 into a four-lane expressway for the length of the entire segment from Wheeler Ridge to Sacramento. The agency did not immediately upgrade Route 99 to a freeway, since the West Side Freeway had already been selected as the preferred alternative for north-south long-distance traffic. As traffic levels along the Route 99 corridor continued to increase, the at-grade intersections on the expressway became extremely dangerous. Drivers on cross-streets who needed to cross the expressway often had to wait for many minutes at those intersections to find suitable gaps in which to dart across heavy through traffic on Route 99 moving at near-freeway speeds. If drivers became impatient or mistimed the speed of through traffic, the result was often a dangerous
side collision A side collision is a vehicle crash where the side of one or more vehicles is impacted. These crashes typically occur at intersections, in parking lots, and when two vehicles pass on a multi-lane roadway. Occurrences and effects For fatali ...
. Therefore, Caltrans upgraded or replaced those intersections one-by-one with freeway interchanges, and often added frontage roads for access to adjacent parcels. This work proceeded very slowly over several decades, as Caltrans needed to balance the rising level of danger at the rural intersections on Route 99 with other urgent construction priorities in California's rapidly growing metropolitan areas. By 2012, there was only one remaining expressway segment with at-grade intersections on Route 99 between Sacramento and Wheeler Ridge, in Merced County between the cities of Chowchilla and Atwater. On December 11, 2012, Caltrans commenced construction on a project to upgrade that segment to a six-lane freeway with full access control. On January 15, 2016, Caltrans officially opened the Plainsburg Road interchange, which completed the conversion of Route 99 south of Sacramento to a freeway built to near-interstate standards.


Future

Caltrans' long-range plans recommend that SR 99 be upgraded to
Interstate Highway standards Standards for Interstate Highways in the United States are defined by the American Association of State Highway and Transportation Officials (AASHTO) in the publication ''A Policy on Design Standards: Interstate System''. For a certain highway to ...
between its southern end and Sacramento, which would require upgrading some substandard sections. Caltrans indicates the route would be designated as either I-7 or I-9, in accordance with the Interstate Highway System's numbering standards (being just east of and parallel to I-5). As route number duplication is not allowed in California, this will necessitate the renumbering of either SR 7 or SR 9.


Junction list


Business routes


Bakersfield

State Route 99 Business (SR 99 Bus.) in the city of
Bakersfield Bakersfield is a city in Kern County, California, United States. It is the county seat and largest city of Kern County. The city covers about near the southern end of the San Joaquin Valley and the Central Valley region. Bakersfield's populat ...
follows Union Avenue and Golden State Avenue. Traveling north on SR 99, the business route begins at exit 11 (Union Avenue), and follows the original routing of
US 99 U.S. Route 99 (US 99) was a main north–south United States Numbered Highway on the West Coast of the United States until 1964, running from Calexico, California, on the US–Mexico border to Blaine, Washington, on the U.S.-Canada borde ...
. Union Avenue is a rural, four-lane road for about until it enters Greenfield at Panama Road. From there, it continues north, passing by the Bakersfield Municipal Airport and the
Kern County Fairgrounds Bakersfield, California has a wide variety of districts and neighborhoods. Generally, its citizens refer to the city by regions, named after directions (for example, the northeast, the northwest, and the southwest). These regions are further broke ...
. Union Avenue widens to six lanes at Ming Avenue, just a few miles before its intersection with SR 58. At the SR 58 junction, the designation SR 204 is added to the route. SR 99 Bus./SR 204 continues north on Union Avenue until the Union Avenue Y-intersection, where the designation heads northwest on Golden State Avenue. The route passes under SR 178 and over Chester Avenue at
Garces Memorial Circle Garces Memorial Traffic Circle, informally known as Garces Circle or just ''The Circle'', is a traffic circle in Bakersfield, California. The traffic circle is located at the intersection of Chester Avenue, Golden State Avenue ( State Route 204) a ...
. At F Street, SR 99 Bus./SR 204 becomes a short four-lane freeway that terminates at SR 99 just before the Olive Drive exit.


See also

* *
Tule fog Tule fog () is a thick ground fog that settles in the San Joaquin Valley and Sacramento Valley areas of California's Central Valley. Tule fog forms from late fall through early spring (California's winter season) after the first significant rai ...


Notes


References


External links

{{Attached KML, display=inline,title
Route 99 highway conditions
at California Department of Transportation

at California Highways
July 24, 2005, San Francisco Chronicle article on Interstate upgrade
at AARoads.com
Virtual Tour of US 99 north of Los AngelesHistoric Highway 99 Association of California
099 Historic trails and roads in California 099 099 State Route 099 State Route 099 State Route 099 State Route 099 State Route 099 State Route 099 State Route 099 State Route 099 State Route 099 State Route 099 State Route 099 State Route 099 State Route 099 State Route 099 California State Route 099 State Route 099 Streets in Visalia, California Transportation in Visalia, California