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The Central Valley is a broad, elongated, flat
valley A valley is an elongated low area often running between Hill, hills or Mountain, mountains, which will typically contain a river or stream running from one end to the other. Most valleys are formed by erosion of the land surface by rivers ...
that dominates the interior 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 ...
. It is wide and runs approximately from north-northwest to south-southeast, inland from and parallel to the
Pacific The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, and is bounded by the continen ...
coast of the state. It covers approximately , about 11% of California's land area. The valley is bounded by the
Coast Ranges The Pacific Coast Ranges (officially gazetted as the Pacific Mountain System in the United States) are the series of mountain ranges that stretch along the West Coast of North America from Alaska south to Northern and Central Mexico. Although the ...
to the west and 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 primarily ...
to the east. The Central Valley is a
region In geography, regions, otherwise referred to as zones, lands or territories, are areas that are broadly divided by physical characteristics (physical geography), human impact characteristics (human geography), and the interaction of humanity and t ...
known for its
agricultural productivity Agricultural productivity is measured as the ratio of agricultural outputs to inputs. While individual products are usually measured by weight, which is known as crop yield, varying products make measuring overall agricultural output difficu ...
: it provides more than half of the fruits, vegetables, and nuts grown in the United States. More than of the valley are irrigated via reservoirs and canals. The valley hosts many cities, including the state capital
Sacramento ) , image_map = Sacramento County California Incorporated and Unincorporated areas Sacramento Highlighted.svg , mapsize = 250x200px , map_caption = Location within Sacramento ...
; as well as Redding, Chico, Stockton,
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- ...
,
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 ...
,
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 ...
,
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 ...
, and
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 ...
. The Central Valley
watershed Watershed is a hydrological term, which has been adopted in other fields in a more or less figurative sense. It may refer to: Hydrology * Drainage divide, the line that separates neighbouring drainage basins * Drainage basin, called a "watershe ...
comprises , or over a third of California. It consists of three main drainage systems: 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 ...
in the north, which receives over of rain annually; the drier
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 ...
in the south, and the Tulare Basin and its semi-arid desert climate at the southernmost end. The
Sacramento ) , image_map = Sacramento County California Incorporated and Unincorporated areas Sacramento Highlighted.svg , mapsize = 250x200px , map_caption = Location within Sacramento ...
and San Joaquin river systems drain their respective valleys and meet to form the
Sacramento–San Joaquin River Delta The Sacramento–San Joaquin River Delta, or California Delta, is an expansive inland river delta and estuary in Northern California. The Delta is formed at the western edge of the Central Valley by the confluence of the Sacramento and San ...
, a large expanse of interconnected
canal Canals or artificial waterways are waterways or engineered channels built for drainage management (e.g. flood control and irrigation) or for conveyancing water transport vehicles (e.g. water taxi). They carry free, calm surface flow un ...
s,
stream bed A stream bed or streambed is the bottom of a stream or river (bathymetry) or the physical confine of the normal water flow (Channel (geography), channel). The lateral confines or channel margins are known as the stream Bank (geography), banks ...
s,
slough Slough () is a town and unparished area in the unitary authority of the same name in Berkshire, England, bordering west London. It lies in the Thames Valley, west of central London and north-east of Reading, at the intersection of the M4 ...
s,
marsh A marsh is a wetland that is dominated by herbaceous rather than woody plant species.Keddy, P.A. 2010. Wetland Ecology: Principles and Conservation (2nd edition). Cambridge University Press, Cambridge, UK. 497 p Marshes can often be found at ...
es and peat islands. The delta empties into the
San Francisco Bay San Francisco Bay is a large tidal estuary in the U.S. state of California, and gives its name to the San Francisco Bay Area. It is dominated by the big cities of San Francisco, San Jose, and Oakland. San Francisco Bay drains water from a ...
, and ultimately into the Pacific. The waters of the Tulare Basin essentially never reach the ocean (with the exception of Kings River waters diverted northward for irrigation), though they are connected by man-made canals to the San Joaquin. The valley encompasses all or parts of 19 California counties:
Butte __NOTOC__ In geomorphology, a butte () is an isolated hill with steep, often vertical sides and a small, relatively flat top; buttes are smaller landforms than mesas, plateaus, and tablelands. The word ''butte'' comes from a French word mea ...
, Colusa, Glenn,
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 ...
,
Kern KERN (1180 AM) is a commercial radio station licensed to Wasco-Greenacres, California, and serving the Bakersfield metropolitan area. The station is owned by American General Media. The radio studios and offices are in the American General Me ...
,
Kings Kings or King's may refer to: *Monarchs: The sovereign heads of states and/or nations, with the male being kings *One of several works known as the "Book of Kings": **The Books of Kings part of the Bible, divided into two parts **The ''Shahnameh'' ...
, 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 ...
, Placer, San Joaquin,
Sacramento ) , image_map = Sacramento County California Incorporated and Unincorporated areas Sacramento Highlighted.svg , mapsize = 250x200px , map_caption = Location within Sacramento ...
, Shasta, Solano, Stanislaus, Sutter, Tehama, Tulare, Yolo and Yuba.


Name

Older names include "the Great Valley", a name still often seen in scientific references (notably
Great Valley Sequence The Great Valley Sequence of California is a -thick group of related geologic formations that are Late Jurassic through Cretaceous in age (150–65 Ma) on the geologic time scale. These sedimentary rocks were deposited during the late Mesozoic ...
), as well as "Golden Empire", a
booster Booster may refer to: Amusement rides * Booster (Fabbri ride), a pendulum ride * Booster (HUSS ride), an evolution of the Breakdance ride * Booster (KMG ride), a pendulum ride Arts, entertainment, and media Fictional characters *Booster, a char ...
name that is still referred to by some organizations (notably
Golden Empire Transit Golden Empire Transit is the operator of mass transportation in Bakersfield, California. There are 16 routes serving Greater Bakersfield, which includes both the City of Bakersfield and adjacent unincorporated communities. Since 2005, nearly the ...
,
Golden Empire Council The Golden Empire Council (GEC-BSA) is a California-based 501(c)(3) nonprofit affiliated with the Boy Scouts of America and its Western Region, Area 4. The council serves a large section of Northern California, primarily the Sacramento Valley and t ...
).


Population

Subregions and their counties commonly associated with the valley include: * North Sacramento Valley (all or parts of Shasta, Tehama, Glenn,
Butte __NOTOC__ In geomorphology, a butte () is an isolated hill with steep, often vertical sides and a small, relatively flat top; buttes are smaller landforms than mesas, plateaus, and tablelands. The word ''butte'' comes from a French word mea ...
and Colusa counties) * Sacramento Metropolitan area (all or parts of
Sacramento ) , image_map = Sacramento County California Incorporated and Unincorporated areas Sacramento Highlighted.svg , mapsize = 250x200px , map_caption = Location within Sacramento ...
,
El Dorado El Dorado (, ; Spanish for "the golden"), originally ''El Hombre Dorado'' ("The Golden Man") or ''El Rey Dorado'' ("The Golden King"), was the term used by the Spanish in the 16th century to describe a mythical tribal chief (''zipa'') or king o ...
, Solano, Sutter, Yuba, Yolo and Placer counties) * North San Joaquin (all or parts of San Joaquin, Stanislaus and
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 ...
counties) * South San Joaquin (all or parts of Madera,
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 ...
,
Kings Kings or King's may refer to: *Monarchs: The sovereign heads of states and/or nations, with the male being kings *One of several works known as the "Book of Kings": **The Books of Kings part of the Bible, divided into two parts **The ''Shahnameh'' ...
, Tulare and
Kern KERN (1180 AM) is a commercial radio station licensed to Wasco-Greenacres, California, and serving the Bakersfield metropolitan area. The station is owned by American General Media. The radio studios and offices are in the American General Me ...
counties) The four main population centers in the Central Valley area are roughly equidistant from the next. From south to north, they are
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 ...
,
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 ...
,
Sacramento ) , image_map = Sacramento County California Incorporated and Unincorporated areas Sacramento Highlighted.svg , mapsize = 250x200px , map_caption = Location within Sacramento ...
and Redding. These four cities act as hubs for regional commerce and transportation.


Metropolitan areas

As of 2010, some 7.2 million people lived in the Central Valley; it was the fastest-growing region in California. It includes 12
Metropolitan Statistical Areas In the United States, a metropolitan statistical area (MSA) is a geographical region with a relatively high population density at its core and close economic ties throughout the area. Such regions are neither legally incorporated as a city or tow ...
(MSA) and 1 Micropolitan Statistical Area (μSA). Below, they are listed by MSA and μSA population. The largest city is
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 ...
followed by the state capital
Sacramento ) , image_map = Sacramento County California Incorporated and Unincorporated areas Sacramento Highlighted.svg , mapsize = 250x200px , map_caption = Location within Sacramento ...
. The following metropolitan and micropolitan statistical areas are listed from largest to smallest:


Ethnography

After English and
Spanish Spanish might refer to: * Items from or related to Spain: **Spaniards are a nation and ethnic group indigenous to Spain **Spanish language, spoken in Spain and many Latin American countries **Spanish cuisine Other places * Spanish, Ontario, Cana ...
,
Punjabi Punjabi, or Panjabi, most often refers to: * Something of, from, or related to Punjab, a region in India and Pakistan * Punjabi language * Punjabi people * Punjabi dialects and languages Punjabi may also refer to: * Punjabi (horse), a British Th ...
is the third most commonly spoken language in the Central Valley. The valley has the largest Sikh population in the nation.


Geography

The flatness of the valley floor contrasts with the rugged hills or gentle mountains that are typical of most of California's terrain. The valley is thought to have originated below sea level as an offshore area depressed by
subduction Subduction is a geological process in which the oceanic lithosphere is recycled into the Earth's mantle at convergent boundaries. Where the oceanic lithosphere of a tectonic plate converges with the less dense lithosphere of a second plate, the ...
of the
Farallon Plate The Farallon Plate was an ancient oceanic plate. It formed one of the three main plates of Panthalassa, alongside the Phoenix Plate and Izanagi Plate, which were connected by a triple junction. The Farallon Plate began subducting under the west c ...
into a trench farther offshore. The valley has no earthquake faults of its own but is surrounded by faults to the east and west. The valley was enclosed by the uplift of the
Coast Ranges The Pacific Coast Ranges (officially gazetted as the Pacific Mountain System in the United States) are the series of mountain ranges that stretch along the West Coast of North America from Alaska south to Northern and Central Mexico. Although the ...
, with its original outlet into
Monterey Bay Monterey Bay is a bay of the Pacific Ocean located on the coast of the U.S. state of California, south of the San Francisco Bay Area and its major city at the south of the bay, San Jose. San Francisco itself is further north along the coast, by a ...
. Faulting moved the Coast Ranges, and a new outlet developed near what is now
San Francisco Bay San Francisco Bay is a large tidal estuary in the U.S. state of California, and gives its name to the San Francisco Bay Area. It is dominated by the big cities of San Francisco, San Jose, and Oakland. San Francisco Bay drains water from a ...
. Over the millennia, the valley filled with the sediments of these same ranges, as well as the rising
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 primarily ...
to the east; that filling eventually created an extraordinary flatness just barely above sea level. Before California's flood control and aqueduct system was built, annual snow melt turned much of the valley into an inland sea. The one notable exception to the flat valley floor is
Sutter Buttes The Sutter Buttes (Maidu: ''Histum Yani'' or ''Esto Yamani'', Wintun: ''Olonai-Tol'', Nisenan: ''Estom Yanim'') are a small circular complex of eroded volcanic lava domes which rise as buttes above the flat plains of the Sacramento Valley in Sut ...
, the remnants of an extinct volcano just to the northwest of
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 ...
. Another significant geologic feature of the Central Valley lies hidden beneath the delta. The Stockton Arch is an upwarping of the crust beneath the valley sediments that extends southwest to northeast across the valley. The Central Valley lies within the California Trough physiographic section, which is part of the larger Pacific Border province, which in turn is part of the
Pacific Mountain System The Pacific Coast Ranges (officially gazetted as the Pacific Mountain System in the United States) are the series of mountain ranges that stretch along the West Coast of North America from Alaska south to Northern and Central Mexico. Although the ...
.


Environment

The Central Valley was formerly a diverse expanse of grassland, containing areas of
prairie Prairies are ecosystems considered part of the temperate grasslands, savannas, and shrublands biome by ecologists, based on similar temperate climates, moderate rainfall, and a composition of grasses, herbs, and shrubs, rather than trees, as the ...
, desert grassland (at the southern end),
oak savanna An oak savanna is a type of savanna—or lightly forested grassland—where oaks (''Quercus ''spp.) are the dominant trees. The terms "oakery" or "woodlands" are also used commonly, though the former is more prevalent when referencing the Mediter ...
,
riparian forest A riparian forest or riparian woodland is a forested or wooded area of land adjacent to a body of water such as a river, stream, pond, lake, marshland, estuary, canal, sink or reservoir. Etymology The term riparian comes from the Latin word '' ...
,
marsh A marsh is a wetland that is dominated by herbaceous rather than woody plant species.Keddy, P.A. 2010. Wetland Ecology: Principles and Conservation (2nd edition). Cambridge University Press, Cambridge, UK. 497 p Marshes can often be found at ...
, several types of seasonal
vernal pool Vernal pools, also called vernal ponds or ephemeral pools, are seasonal pools of water that provide habitat for distinctive plants and animals. They are considered to be a distinctive type of wetland usually devoid of fish, and thus allow the safe ...
s, and large lakes such as now-dry
Tulare Lake Tulare Lake () (Spanish: ''Laguna de Tache'', Yokuts: ''Pah-áh-su'') is a freshwater dry lake with residual wetlands and marshes in the southern San Joaquin Valley, California, United States. After Lake Cahuilla disappeared in the 17th century ...
(once the largest
freshwater lake A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much larger ...
west of the Mississippi),
Buena Vista Lake Buena Vista Lake was a fresh-water lake in Kern County, California, in the Tulare Lake Basin in the southern San Joaquin Valley, California. Buena Vista Lake was the second largest of several similar lakes in the Tulare Lake basin, and was fed ...
and Kern Lake. However, much of the Central Valley environment has been altered by human activity, including the introduction of
exotic plant An introduced species, alien species, exotic species, adventive species, immigrant species, foreign species, non-indigenous species, or non-native species is a species living outside its native distributional range, but which has arrived there ...
s, notably grasses. The valley's grasslands, wetlands, and riparian forests constitute the
California Central Valley grasslands The California Central Valley grasslands is a temperate grasslands, savannas, and shrublands ecoregion in California's Central Valley. It a diverse ecoregion containing areas of desert grassland (at the southern end), prairie, savanna, riparian ...
, a
temperate grasslands, savannas, and shrublands Temperate grasslands, savannas, and shrublands is a terrestrial biome defined by the World Wide Fund for Nature. The predominant vegetation in this biome consists of grass and/or shrubs. The climate is temperate and ranges from Semi-arid climate ...
ecoregion An ecoregion (ecological region) or ecozone (ecological zone) is an ecologically and geographically defined area that is smaller than a bioregion, which in turn is smaller than a biogeographic realm. Ecoregions cover relatively large areas of l ...
. The foothill oak woodlands and
chaparral Chaparral ( ) is a shrubland plant community and geographical feature found primarily in the U.S. state of California, in southern Oregon, and in the northern portion of the Baja California Peninsula in Mexico. It is shaped by a Mediterranean c ...
that fringe the valley have been categorized as the
California interior chaparral and woodlands The California interior chaparral and woodlands ecoregion covers in an elliptical ring around the California Central Valley. It occurs on hills and mountains ranging from to . It is part of the Mediterranean forests, woodlands, and scrub biom ...
ecoregion.


Flora

The dominant grass of the valley was ''
Nassella pulchra ''Nassella pulchra'', basionym ''Stipa pulchra'', is a species of grass known by the common names purple needlegrass and purple tussockgrass. It is native to the U.S. state of California, where it occurs throughout the coastal hills, valleys, an ...
'' mixed with other species, but today only 1% of the grassland in the valley is intact. Grassland flowers include
California poppy ''Eschscholzia californica'', the California poppy, golden poppy, California sunlight or cup of gold, is a species of flowering plant in the family Papaveraceae, native to the United States and Mexico. It is cultivated as an ornamental plant f ...
(''Eschscholzia californica''),
lupin ''Lupinus'', commonly known as lupin, lupine, or regionally bluebonnet etc., is a genus of plants in the legume family Fabaceae. The genus includes over 199 species, with centers of diversity in North and South America. Smaller centers occur ...
s, and purple owl's clover (''
Castilleja exserta ''Castilleja exserta'' (formerly ''Orthocarpus purpurascens'') is a species of plant in the genus ''Castilleja'' which includes the Indian paintbrushes. Its common names include purple owl's clover, escobita, and exserted Indian paintbrush. Thi ...
''), which can still be seen, especially in
Antelope Valley The Antelope Valley is located in northern Los Angeles County, California, and the southeast portion of Kern County, California, and constitutes the western tip of the Mojave Desert. It is situated between the Tehachapi, Sierra Pelona, and the ...
in the
Tehachapi Mountains The Tehachapi Mountains (; Kawaiisu: ''Tihachipia'', meaning "hard climb") are a mountain range in the Transverse Ranges system of California in the Western United States. The range extends for approximately in southern Kern County and northwest ...
. Riverside trees include willows, western sycamore (''
Platanus racemosa ''Platanus racemosa'' is a species of plane tree known by several common names, including California sycamore, western sycamore, California plane tree, and in North American Spanish aliso. ''Platanus racemosa'' is native to California and Baja C ...
''), box elder (''
Acer negundo ''Acer negundo'', the box elder, boxelder maple, Manitoba maple or ash-leaved maple, is a species of maple native to North America. It is a fast-growing, short-lived tree with opposite, compound leaves. It is sometimes considered a weedy or inv ...
''), Fremont cottonwood (''
Populus fremontii ''Populus fremontii'', commonly known as Frémont's cottonwood, is a cottonwood (and thus a poplar) native to riparian zones of the Southwestern United States and northern through central Mexico. It is one of three species in ''Populus'' sect. ...
''), and the endemic valley oak (''
Quercus lobata ''Quercus lobata'', commonly called the valley oak or roble, grows into the largest of California oaks. It is endemic to California, growing in interior valleys and foothills from Siskiyou County to San Diego County. Mature specimens may attain a ...
'').


Fauna

The Central Valley was once home to large populations of
pronghorn The pronghorn (, ) (''Antilocapra americana'') is a species of artiodactyl (even-toed, hoofed) mammal indigenous to interior western and central North America. Though not an antelope, it is known colloquially in North America as the American a ...
antelope (''Antilocapra americana''),
elk The elk (''Cervus canadensis''), also known as the wapiti, is one of the largest species within the deer family, Cervidae, and one of the largest terrestrial mammals in its native range of North America and Central and East Asia. The common ...
including the endemic
tule elk The tule elk (''Cervus canadensis nannodes'') is a subspecies of elk found only in California, ranging from the grasslands and marshlands of the Central Valley to the grassy hills on the coast. The subspecies name derives from the tule (), a s ...
subspecies (''Cervus elaphus nannodes''),
mule deer The mule deer (''Odocoileus hemionus'') is a deer indigenous to western North America; it is named for its ears, which are large like those of the mule. Two subspecies of mule deer are grouped into the black-tailed deer. Unlike the related whit ...
(''Odocoileus hemionus''),
California ground squirrel The California ground squirrel (''Otospermophilus beecheyi''), also known as the Beechey ground squirrel, is a common and easily observed ground squirrel of the western United States and the Baja California Peninsula; it is common in Oregon and ...
s,
gopher Pocket gophers, commonly referred to simply as gophers, are burrowing rodents of the family Geomyidae. The roughly 41 speciesSearch results for "Geomyidae" on thASM Mammal Diversity Database are all endemic to North and Central America. They are ...
s, mice, hare, rabbits and
kangaroo rat Kangaroo rats, small mostly nocturnal rodents of genus ''Dipodomys'', are native to arid areas of western North America. The common name derives from their bipedal form. They hop in a manner similar to the much larger kangaroo, but developed thi ...
s, along with their predators including the
San Joaquin kit fox The endangered San Joaquin kit fox (''Vulpes macrotis mutica'') was formerly very common in the San Joaquin Valley and through much of Central California. Its 1990 population was estimated to be 7,000. This subspecies is still endangered, after n ...
(an endangered subspecies surviving on the San Joaquin Valley's hillsides). The valley's wetlands were an important habitat for wintering
waterbirds A water bird, alternatively waterbird or aquatic bird, is a bird that lives on or around water. In some definitions, the term ''water bird'' is especially applied to birds in freshwater ecosystems, although others make no distinction from seabi ...
and migrating birds of other kinds. Reptiles and amphibians of the valley include the endemic San Joaquin coachwhip snake (''
Masticophis flagellum ''Masticophis flagellum'' is a species of nonvenomous colubrid snake, commonly referred to as the coachwhip or the whip snake, which is endemic to the United States and Mexico. Six subspecies are recognized, including the nominotypical subspecies ...
ruddocki''),
blunt-nosed leopard lizard ''Gambelia sila'', commonly known as the blunt-nosed leopard lizard, is a species of lizard in the family Crotaphytidae. The species is endemic to southern California. Taxonomy ''Gambelia sila'' was originally described by Leonhard Stejneger in ...
(''Gambelia sila''),
Gilbert's skink ''Plestiodon gilberti'', commonly known as Gilbert's skink, is a species of heavy-bodied medium-sized lizard in the family Scincidae. The species is endemic to the southwestern United States, and grows to about in total length (including tail ...
(''Eumeces gilberti'') and the western aquatic garter snake (''Thamnophis couchii''). Endemic invertebrates are present. The Central Valley is home to endemic fish species, including the
Sacramento Pikeminnow The Sacramento pikeminnow (''Ptychocheilus grandis''), formerly known as the Sacramento squawfish, is a large cyprinid fish of California, United States. It is native to the Los Angeles River, Sacramento- San Joaquin, Pajaro- Salinas, Russian Ri ...
, Sacramento Perch,
Sacramento Blackfish The Sacramento blackfish (''Orthodon microlepidotus'') is a species of freshwater fish in central California. A cyprinid, the blackfish is the sole member of its genus. Distribution and habitat Blackfish are primarily denizens of the warm and ...
, and
Sacramento Splittail The splittail (''Pogonichthys macrolepidotus''), also called Sacramento splittail, is a cyprinid fish native to the low-elevation waters of the Central Valley in California. It was first described by William O. Ayres in 1854. It is the sole li ...
.


Protected areas

The
Great Valley Grasslands State Park Great Valley Grasslands State Park is a state park of California, United States, preserving a parcel of remnant native grassland in the San Joaquin Valley. Such a temperate grasslands, savannas, and shrublands biome was once widespread througho ...
preserves an example of the valley's native grass
habitat In ecology, the term habitat summarises the array of resources, physical and biotic factors that are present in an area, such as to support the survival and reproduction of a particular species. A species habitat can be seen as the physical ...
, while oak savanna habitats survive near
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 ...
. Areas of wetland and riverside woodland are found in the north, especially by the Sacramento River system, including the
Nature Conservancy The Nature Conservancy (TNC) is a global environmental organization headquartered in Arlington, Virginia. it works via affiliates or branches in 79 countries and territories, as well as across every state in the US. Founded in 1951, The Natu ...
's
Cosumnes River Preserve The Cosumnes River Preserve is a nature preserve of over located 20 miles (30 km) south of Sacramento, in the US state of California. The preserve protects a Central Valley remnant that once contained one of the largest expanses of oak tre ...
just south of Sacramento, Gray Lodge Wildlife Area,
Butte Sink Wildlife Management Area Butte Sink Wildlife Management Area is located in Colusa, Butte, and Sutter Counties. It is wetlands managed as part of the Sacramento National Wildlife Refuge Complex and is not open to the public. Within the Wildlife Management Area (WMA), c ...
, and other patches in the delta area. Remaining vernal pools include
Pixley National Wildlife Refuge Pixley National Wildlife Refuge is located south of Tulare, California and north of Bakersfield, California, Bakersfield in the San Joaquin Valley. The nature refuge represents one of the few remaining examples of the grasslands, vernal pools, ...
between
Tulare, California Tulare ( ) is a city in Tulare County, California. The population was 68,875 at the 2020 census. It is located in the heart of the San Joaquin Valley, eight miles south of Visalia and sixty miles north of Bakersfield. The city is named for th ...
, and Bakersfield and Jepson Prairie Preserve in the delta. Large blocks of desert scrubland exist in the southern San Joaquin Valley and the
Carrizo Plain The Carrizo Plain ( Obispeño: ''tšɨłkukunɨtš'', "Place of the rabbits") is a large enclosed grassland plain, approximately long and up to across, in southeastern San Luis Obispo County, California, about northwest of Los Angeles. It con ...
, just outside the valley, but offering a similar landscape. The wetlands have been the target of rescue operations to restore areas replaced by agriculture. These patches of natural habitat are disconnected, which is particularly damaging for wildlife that is used to migrating along the rivers. Agriculture, grazing land, and the draining of lakes and rivers have radically altered valley habitats. Most of the grassland has been overtaken by new species; most vernal pools have been destroyed, leaving only those on the higher slopes; the marshland has been drained, and the riverbank woodlands have nearly all been affected.


Health

The valley gives its name to
Valley fever A valley is an elongated low area often running between hills or mountains, which will typically contain a river or stream running from one end to the other. Most valleys are formed by erosion of the land surface by rivers or streams ove ...
, which is primarily a disease of the lungs that is common in the southwestern United States and northwestern Mexico. It is caused by the
fungus A fungus ( : fungi or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. These organisms are classified as a kingdom, separately from th ...
''
Coccidioides immitis ''Coccidioides immitis'' is a pathogenic fungus that resides in the soil in certain parts of the southwestern United States, northern Mexico, and a few other areas in the Western Hemisphere. Epidemiology ''C. immitis'', along with its relati ...
'', which grows in soils in areas of low rainfall, high summer temperatures, and moderate winter temperatures. These fungal spores become airborne when the soil is disturbed by winds, construction, or farming. This illness frequently takes weeks or months to resolve. Occasionally Valley Fever is life-threatening or even fatal. Due to the agricultural industry's significant presence in the Valley,
pesticide drift Pesticide drift refers to the unintentional diffusion of pesticides and the potential negative effects of pesticide application, including off-target contamination due to spray drift as well as runoff from plants or soil. This can lead to damage ...
and leaching have become concerns. Residents risk contamination when living in proximity to application sites.


Air Pollution

Air pollution is a growing problem that affects all of the citizens in the Central Valley. Some reasons of poor air pollution in the Central Valley are due to agriculture and its geographical features. Since the Central Valley consists mostly of farming land, a wide, flat valley, the emissions from the soil that is used for growing produce are released into the air. The soil exudes nitrous oxide, an odorless and colorless gas that can be harmful when exposed to it for a long period of time, and incorporates itself into the ozone layer located at ground level. Production of nitrous oxide in California has shown that the addition of soil and fertilization can emit about 161,100 metric tons per year. Long term effects that nitrous oxide can have on a human being is loss of blood pressure, fainting, anemia, or lung cancer. The physical geographical attributes can also contribute to the air pollution quality. The Central Valley is surrounded by mountain ranges which can capture the pollution coming from the agricultural farming, preventing it from dispersing from the other areas in California. The Central Valley is also expanding in the number of people that coincide in that area, so it increases the number of cars which can also contribute to the amount of emission that is in the air.


Climate

The northern Central Valley has a hot
Mediterranean climate A Mediterranean climate (also called a dry summer temperate climate ''Cs'') is a temperate climate sub-type, generally characterized by warm, dry summers and mild, fairly wet winters; these weather conditions are typically experienced in the ...
(
Köppen climate classification The Köppen climate classification is one of the most widely used climate classification systems. It was first published by German-Russian climatologist Wladimir Köppen (1846–1940) in 1884, with several later modifications by Köppen, notabl ...
''Csa''); the more southerly parts in
rainshadow A rain shadow is an area of significantly reduced rainfall behind a mountainous region, on the side facing away from prevailing winds, known as its leeward side. Evaporated moisture from water bodies (such as oceans and large lakes) is carri ...
zones are dry enough to be Mediterranean steppe (''BShs'', as around
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 ...
) or even low-latitude desert (''BWh'', as in areas around
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 ...
). It is very hot and dry during the summer and cool and damp in winter when frequent ground fog known regionally as "
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 ...
" can obscure vision. Summer daytime temperatures frequently surpass , and common
heat wave A heat wave, or heatwave, is a period of excessively hot weather, which may be accompanied by high humidity, especially in oceanic climate countries. While definitions vary, a heat wave is usually measured relative to the usual climate in the ...
s might bring temperatures exceeding . Mid-autumn to mid-spring is the ''rainy season''—although during the late summer, southeasterly winds can bring tropical thunderstorms, mainly in the southern half 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 ...
but occasionally to 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 ...
. The northern half of the Central Valley receives greater precipitation than the
semidesert A semi-arid climate, semi-desert climate, or steppe climate is a dry climate sub-type. It is located on regions that receive precipitation below potential evapotranspiration, but not as low as a desert climate. There are different kinds of semi-ar ...
southern half. Frost occurs at times in the fall months, but snow is extremely rare.


Tule fog

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 ...
is a thick ground
fog Fog is a visible aerosol consisting of tiny water droplets or ice crystals suspended in the air at or near the Earth's surface. Reprint from Fog can be considered a type of low-lying cloud usually resembling stratus, and is heavily influ ...
that settles along the valley's length. Tule fog forms during the late fall and winter (California's
rainy season The rainy season is the time of year when most of a region's average annual rainfall occurs. Rainy Season may also refer to: * ''Rainy Season'' (short story), a 1989 short horror story by Stephen King * "Rainy Season", a 2018 song by Monni * ''T ...
), after the first significant rainfall. The official season is from November 1 to March 31. This phenomenon is named after the valley's tule grass wetlands (''tulares''). Auto collisions caused by the tule fog are the leading cause of weather-related casualties in California.


Statistics for selected cities


Hydrography

Two river systems drain and define the two parts of the Central Valley. 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 ...
, along with its tributaries 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 ...
and
American River , name_etymology = , image = American River CA.jpg , image_size = 300 , image_caption = The American River at Folsom , map = Americanrivermap.png , map_size = 300 , map_caption ...
, flows southwards through the Sacramento Valley for about . In the San Joaquin Valley, the
San Joaquin River The San Joaquin River (; es, Río San Joaquín) is the longest river of Central California. The long river starts in the high Sierra Nevada, and flows through the rich agricultural region of the northern San Joaquin Valley before reaching Suis ...
flows roughly northwest for , picking up tributaries such as the
Merced River The Merced River (), in the central part of the U.S. state of California, is a -long tributary of the San Joaquin River flowing from the Sierra Nevada (U.S.), Sierra Nevada into the San Joaquin Valley. It is most well known for its swift and st ...
,
Tuolumne River The Tuolumne River ( Yokutsan: ''Tawalimnu'') flows for through Central California, from the high Sierra Nevada to join the San Joaquin River in the Central Valley. Originating at over above sea level in Yosemite National Park, the Tuolumne ...
,
Stanislaus River The Stanislaus River is a tributary of the San Joaquin River in north-central California in the United States. The main stem of the river is long, and measured to its furthest headwaters it is about long. Originating as three forks in the high ...
and
Mokelumne River The Mokelumne River ( or ; ''Mokelumne'', Miwok for "People of the Fish Net") is a -long river in northern California in the United States. The river flows west from a rugged portion of the central Sierra Nevada (U.S.), Sierra Nevada into the Ce ...
. The Central Valley
watershed Watershed is a hydrological term, which has been adopted in other fields in a more or less figurative sense. It may refer to: Hydrology * Drainage divide, the line that separates neighbouring drainage basins * Drainage basin, called a "watershe ...
encompasses over a third of California at , with 46 percent draining into the Sacramento River, 26 percent into the San Joaquin, and 27 percent into Tulare Lake. In the south part of the San Joaquin Valley, the
alluvial fan An alluvial fan is an accumulation of sediments that fans outwards from a concentrated source of sediments, such as a narrow canyon emerging from an escarpment. They are characteristic of mountainous terrain in arid to semiarid climates, but a ...
of the Kings River and another from Coast Ranges streams have created a divide. The dry Tulare basin of the Central Valley receives flow from four major Sierra Nevada rivers, the Kings, Kaweah,
Tule ''Schoenoplectus acutus'' ( syn. ''Scirpus acutus, Schoenoplectus lacustris, Scirpus lacustris'' subsp. ''acutus''), called tule , common tule, hardstem tule, tule rush, hardstem bulrush, or viscid bulrush, is a giant species of sedge in the pl ...
, and
Kern KERN (1180 AM) is a commercial radio station licensed to Wasco-Greenacres, California, and serving the Bakersfield metropolitan area. The station is owned by American General Media. The radio studios and offices are in the American General Me ...
. This basin, usually
endorheic An endorheic basin (; also spelled endoreic basin or endorreic basin) is a drainage basin that normally retains water and allows no outflow to other external bodies of water, such as rivers or oceans, but drainage converges instead into lakes ...
, formerly filled during snowmelt and spilled out into the San Joaquin River. Called
Tulare Lake Tulare Lake () (Spanish: ''Laguna de Tache'', Yokuts: ''Pah-áh-su'') is a freshwater dry lake with residual wetlands and marshes in the southern San Joaquin Valley, California, United States. After Lake Cahuilla disappeared in the 17th century ...
, it is usually dry because the rivers feeding it have been diverted for agricultural purposes. Central Valley rivers converge in the Sacramento-San Joaquin Delta, a network of marshy channels, distributaries, and sloughs that wind around islands mainly used for agriculture. There the rivers merge with tidewater, and eventually reach the ocean after passing through
Suisun Bay Suisun Bay ( ; Wintun for "where the west wind blows") is a shallow tidal estuary (a northeastern extension of the San Francisco Bay) in Northern California. It lies at the confluence of the Sacramento River and San Joaquin River, forming the ent ...
,
San Pablo Bay San Pablo Bay is a tidal estuary that forms the northern extension of San Francisco Bay in the East Bay and North Bay regions of the San Francisco Bay Area in northern California. Most of the Bay is shallow; however, there is a deep water ch ...
, upper
San Francisco Bay San Francisco Bay is a large tidal estuary in the U.S. state of California, and gives its name to the San Francisco Bay Area. It is dominated by the big cities of San Francisco, San Jose, and Oakland. San Francisco Bay drains water from a ...
, and finally the
Golden Gate The Golden Gate is a strait on the west coast of North America that connects San Francisco Bay to the Pacific Ocean. It is defined by the headlands of the San Francisco Peninsula and the Marin Peninsula, and, since 1937, has been spanned by th ...
. Many of the islands lie below sea level because of intensive agriculture, and face a high risk of flooding, which would allow salt water to rush back into the delta, especially when too little fresh water is flowing in from the Valley. The Sacramento River carries far more water than the San Joaquin, with an estimated of virgin annual runoff, as compared to the San Joaquin's approximately . Intensive agricultural and municipal water consumption decreased the rate of outflow to about for the Sacramento and for the San Joaquin. These figures vary widely from year to year. Over 25 million people, living in the valley and other regions of the state, rely on the water carried by these rivers.


Engineering

Sierra Nevada runoff provides one of California's largest water resources. The Sacramento River is the second largest river to empty into the Pacific from the
contiguous United States The contiguous United States (officially the conterminous United States) consists of the 48 adjoining U.S. states and the Federal District of the United States of America. The term excludes the only two non-contiguous states, Alaska and Hawaii ...
, behind only the
Columbia River The Columbia River (Upper Chinook: ' or '; Sahaptin: ''Nch’i-Wàna'' or ''Nchi wana''; Sinixt dialect'' '') is the largest river in the Pacific Northwest region of North America. The river rises in the Rocky Mountains of British Columbia, C ...
and greater than the
Colorado River The Colorado River ( es, Río Colorado) is one of the principal rivers (along with the Rio Grande) in the Southwestern United States and northern Mexico. The river drains an expansive, arid drainage basin, watershed that encompasses parts of ...
. Combined with the fertile and expansive area of the Central Valley's floor, the Central Valley is ideal for agriculture. The Central Valley is one of the United States' most productive growing regions. This is made possible by engineering the watercourses to prevent flooding during the spring snowmelt and drying up in the summer and autumn. Many dams, including
Shasta Dam Shasta Dam (called Kennett Dam before its construction) is a concrete arch-gravity dam across the Sacramento River in Northern California in the United States. At high, it is the eighth-tallest dam in the United States. Located at the north e ...
,
Oroville Dam Oroville Dam is an earthfill embankment dam on the Feather River east of the city of Oroville, California, in the Sierra Nevada foothills east of the Sacramento Valley. At 770 feet (235 m) high, it is the tallest dam in the U.S. and serv ...
,
Folsom Dam Folsom Dam is a concrete gravity dam on the American River of Northern California in the United States, about northeast of Sacramento. The dam is high and long, flanked by earthen wing dams. It was completed in 1955, and officially opened the ...
,
New Melones Dam New Melones Dam is an earth and rock filled embankment dam on the Stanislaus River, about west of Jamestown, California, United States, on the border of Calaveras County and Tuolumne County. The water impounded by the dam forms New Melones ...
,
Don Pedro Dam The Don Pedro Dam, since 1971 also known as the Old Don Pedro Dam, was a dam across the Tuolumne River in Tuolumne County, California. The structure still exists and is flooded underneath Don Pedro Reservoir, which is formed by the New Don Pedro ...
,
Hetch Hetchy Dam O'Shaughnessy Dam is a high concrete arch-gravity dam in Tuolumne County, California, United States. It impounds the Tuolumne River, forming the Hetch Hetchy, Hetch Hetchy Reservoir at the lower end of Hetch Hetchy, Hetch Hetchy Valley in Yos ...
,
Friant Dam Friant Dam is a concrete gravity dam on the San Joaquin River in central California in the United States, on the boundary of Fresno and Madera Counties. It was built between 1937 and 1942 as part of a U.S. Bureau of Reclamation (USBR) water pr ...
,
Pine Flat Dam Pine Flat Dam is a concrete gravity dam on the Kings River (California), Kings River in the Central Valley (California), Central Valley of Fresno County, California United States. Situated about east of Fresno, California, Fresno, the dam is hi ...
and
Isabella Dam Isabella Dam is an embankment dam located in the Kern River Valley, about halfway down the Kern River course, between the towns of Kernville and Lake Isabella in Kern County, California. Isabella Dam serves agricultural, hydroelectric, and fl ...
, were constructed on the rivers, with many of them being part of the
Central Valley Project The Central Valley Project (CVP) is a federal power and water management project in the U.S. state of California under the supervision of the United States Bureau of Reclamation (USBR). It was devised in 1933 in order to provide irrigation and m ...
. These dams impact physical, economic, cultural, and ecological resources: for example, enabling the development of its vast agricultural resources but leading to the loss of the
Chinook salmon The Chinook salmon (''Oncorhynchus tshawytscha'') is the largest and most valuable species of Pacific salmon in North America, as well as the largest in the genus ''Oncorhynchus''. Its common name is derived from the Chinookan peoples. Other ve ...
. Post-World War II demand for urban development, most notably the
San Francisco Bay Area The San Francisco Bay Area, often referred to as simply the Bay Area, is a populous region surrounding the San Francisco, San Pablo, and Suisun Bay estuaries in Northern California. The Bay Area is defined by the Association of Bay Area Go ...
and the
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' ...
/
Inland Empire The Inland Empire (IE) is a metropolitan area and region inland of and adjacent to coastal Southern California, centering around the cities of San Bernardino and Riverside, and bordering Los Angeles County to the west. It includes the cities o ...
/
San Diego San Diego ( , ; ) is a city on the Pacific Ocean coast of Southern California located immediately adjacent to the Mexico–United States border. With a 2020 population of 1,386,932, it is the List of United States cities by population, eigh ...
, required water resources. Moreover, agriculture in the southern Central Valley required far more water than was available locally. 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 ...
in the Sacramento Valley was looked to as a water source, leading to the
California State Water Project The California State Water Project, commonly known as the SWP, is a state water management project in the U.S. state of California under the supervision of the California Department of Water Resources. The SWP is one of the largest public water ...
. This transports water to the southern San Joaquin Valley and urban areas south of the Tehachapi Mountains. Runoff from the Sacramento and San Joaquin Rivers is intercepted in the delta through a series of pumps that divert water into the
California Aqueduct The Governor Edmund G. Brown California Aqueduct is a system of canals, tunnels, and pipelines that conveys water collected from the Sierra Nevada Mountains and valleys of Northern and Central California to Southern California. Named after Cali ...
, which runs south along the length of the San Joaquin Valley. In parallel, pumps divert water into the
Delta–Mendota Canal The Delta–Mendota Canal is a aqueduct in central California, United States. The canal was designed and completed in 1951 by the U.S. Bureau of Reclamation as part of the Central Valley Project. It carries freshwater to replace San Joaquin R ...
. The flow of the Sacramento River is further supplemented by a tunnel from the Trinity River (a tributary of the
Klamath River The Klamath River (Karuk: ''Ishkêesh'', Klamath: ''Koke'', Yurok: ''Hehlkeek 'We-Roy'') flows through Oregon and northern California in the United States, emptying into the Pacific Ocean. By average discharge, the Klamath is the second larges ...
, northwest of the Sacramento Valley) near Redding. Cities of the
San Francisco Bay Area The San Francisco Bay Area, often referred to as simply the Bay Area, is a populous region surrounding the San Francisco, San Pablo, and Suisun Bay estuaries in Northern California. The Bay Area is defined by the Association of Bay Area Go ...
, also needing water, built aqueducts from the
Mokelumne River The Mokelumne River ( or ; ''Mokelumne'', Miwok for "People of the Fish Net") is a -long river in northern California in the United States. The river flows west from a rugged portion of the central Sierra Nevada (U.S.), Sierra Nevada into the Ce ...
and
Tuolumne River The Tuolumne River ( Yokutsan: ''Tawalimnu'') flows for through Central California, from the high Sierra Nevada to join the San Joaquin River in the Central Valley. Originating at over above sea level in Yosemite National Park, the Tuolumne ...
that run east to west across the middle part of the Central Valley.


Flooding

Most valley lowlands are prone to flooding, especially in the old
Tulare Lake Tulare Lake () (Spanish: ''Laguna de Tache'', Yokuts: ''Pah-áh-su'') is a freshwater dry lake with residual wetlands and marshes in the southern San Joaquin Valley, California, United States. After Lake Cahuilla disappeared in the 17th century ...
,
Buena Vista Lake Buena Vista Lake was a fresh-water lake in Kern County, California, in the Tulare Lake Basin in the southern San Joaquin Valley, California. Buena Vista Lake was the second largest of several similar lakes in the Tulare Lake basin, and was fed ...
, and Kern Lake rivers. The
Kings Kings or King's may refer to: *Monarchs: The sovereign heads of states and/or nations, with the male being kings *One of several works known as the "Book of Kings": **The Books of Kings part of the Bible, divided into two parts **The ''Shahnameh'' ...
, Kaweah,
Tule ''Schoenoplectus acutus'' ( syn. ''Scirpus acutus, Schoenoplectus lacustris, Scirpus lacustris'' subsp. ''acutus''), called tule , common tule, hardstem tule, tule rush, hardstem bulrush, or viscid bulrush, is a giant species of sedge in the pl ...
and
Kern KERN (1180 AM) is a commercial radio station licensed to Wasco-Greenacres, California, and serving the Bakersfield metropolitan area. The station is owned by American General Media. The radio studios and offices are in the American General Me ...
rivers originally flowed into these seasonal lakes, which would expand each spring to flood large parts of the southern San Joaquin Valley. Farms, towns, and infrastructure in these lakebeds are protected with levee systems, while the risk of floods damaging properties increased greatly. The
Great Flood of 1862 The Great Flood of 1862 was the largest flood in the recorded history of Oregon, Nevada, and California, occurring from December 1861 to January 1862. It was preceded by weeks of continuous rains and snows in the very high elevations that began in ...
was the valley's worst flood in recorded history, flooding most of the valley and putting some places as much as 20 feet under water. In 2003, it was determined that Sacramento had both the least protection against and nearly the highest risk of flooding. Congress then granted a $220 million loan for upgrades in Sacramento County. Other counties in the valley that often face flooding are Yuba, Stanislaus, and San Joaquin.


Rain

California is a state that has experienced consistent on-and-off drought for many years. In 2012, there was a major drop in precipitation levels in the Central Valley which has caused an almost constant drought and low-level precipitation levels throughout the Northern California region. As of 2014, the highest levels of precipitation occur during December and January, and because of the climate of the Central Valley, rainfall is the most common form of precipitation.


Landslides

There is a very strong positive correlation between rainfall and slow-moving
landslide Landslides, also known as landslips, are several forms of mass wasting that may include a wide range of ground movements, such as rockfalls, deep-seated grade (slope), slope failures, mudflows, and debris flows. Landslides occur in a variety of ...
s in Northern California, especially in the Central Valley region. Changes in climate and precipitation levels have shown that consistent average rainfall has increased the number and intensity of landslides within the past 5–6 years. This information was shown in a study that focused on the behavior of these slow-moving landslides and how their nature changed with years of extreme average rainfall versus minimal average rainfall. In 2016, the average annual precipitation levels were lower because of a drought that was coming to an end at that time. The minimal rainfall in that year showed that 119 landslides had been moving. Comparatively, in 2017, there were very extreme levels of precipitation in the Central Valley, which cause 312 landslides to move that year. Slow-moving landslides are impacted even if the intensity of the rainfall is not as severe. Consistent, moderately intense rainfall increases the saturation of water in the ground. This over-saturation is what causes the movement of a slow-moving landslide, rather than the more quick-moving and rigorous landslides that also occur in this region of California. Quick-moving landslides are caused by very intense rain, or sometimes earthquakes, that make a greater difference in the land in a shorter amount of time. According to a survey paper written in 1988 about a storm that occurred in 1982 in the Central Valley region, rainstorms that can cause that type of landslide to happen about every 5 years. Landslides to higher degrees, such as the ones that happened due to the 1982 storm, only occur every 20 to 100+ years. This intense storm in the San Francisco Bay area caused a lot of damage as a result of moving debris and landslides. They caused damage to the land and put people living in these areas that are susceptible to these disasters in great harm. The aftermath of this storm involved millions of dollars in retributions to restore the land and surrounding areas. It also led people to make greater efforts into planning around the danger of these landslides, as in how to manipulate the land to accommodate the consequences.


Droughts

Out of the past twenty-two years, California has experienced significant drought conditions for thirteen years. From 2000 to 2018 was the second driest period that California has ever experienced. The driest three-year period ever in California was from 2012 to 2014. Three-quarters of the state of California is experiencing extreme drought conditions. There are also multiple types of droughts such as agricultural droughts, meteorological droughts, snow droughts, and hydrological droughts. All of these droughts affect California in different ways. Droughts can damage forests and can cause wildfires. Droughts cause forests to become dry which causes trees to die. Dead trees result in wildfires. The U.S. drought monitor is released every Thursday, showing which parts of the U.S. are in a drought. It started in 2000, and since then the longest duration of a drought in California lasted a total of 376 weeks. It started on December 11, 2011, and ended on March 5, 2019. The most intense period captured on the drought monitor was on the week of July 29, 2014. It showed that 58.41% of California's land was affected by a drought. In 2014–2015, farm-related losses in California totaled $5 billion and 20,000 farmers also lost their jobs.


Economy

Agriculture is the primary industry in most of the Central Valley. A notable exception is the Sacramento area, which hosts a large and stable workforce of government employees. Despite state hiring cutbacks and the closure of several military bases, Sacramento's economy has continued to expand and diversify and now more closely resembles that of the San Francisco Bay Area. Primary sources of population growth are Bay Area migrants seeking lower housing costs, augmented by immigration from Asia, Central America, Mexico, Ukraine, and the rest of the former Soviet Union.


Agriculture

The Central Valley is one of the world's most productive agricultural regions. More than 230 crops are grown there. On less than 1 percent of the total farmland in the United States, the Central Valley produces 8 percent of the nation's agricultural output by value: US$43.5 billion in 2013. California's farms and ranches earned almost $50 billion in 2018. The valley's productivity relies on irrigation from surface water and badly depleted underground aquifers. About one-sixth of the US' irrigated land is in the Central Valley. Virtually all non-tropical crops are grown in the Central Valley, which is the primary source for produce throughout the United States, including tomatoes, grapes, cotton, apricots, and asparagus. Six thousand
almond The almond (''Prunus amygdalus'', syn. ''Prunus dulcis'') is a species of tree native to Iran and surrounding countries, including the Levant. The almond is also the name of the edible and widely cultivated seed of this tree. Within the genus ...
growers produced more than in 2000, about 70 percent of the world's supply and nearly 100 percent of domestic production. The US' top four counties in agricultural sales are in the Central Valley (2007 Data). Early farming was concentrated close to the Sacramento-San Joaquin Delta, where the water table was high year-round and water transport was readily available. Subsequent irrigation projects brought many more parts of the valley into productive use. The even larger
California State Water Project The California State Water Project, commonly known as the SWP, is a state water management project in the U.S. state of California under the supervision of the California Department of Water Resources. The SWP is one of the largest public water ...
was formed in the 1950s and construction continued over the following decades.


National Farmworkers Association (NFWA)

In the 1960s, farm labor leaders
Cesar Chavez Cesar Chavez (born Cesario Estrada Chavez ; ; March 31, 1927 – April 23, 1993) was an American labor leader and civil rights activist. Along with Dolores Huerta, he co-founded the National Farm Workers Association (NFWA), which later merged ...
and
Dolores Huerta Dolores Clara Fernández Huerta (born April 10, 1930) is an American labor leader and civil rights activist who, with Cesar Chavez, is a co-founder of the National Farmworkers Association, which later merged with the Agricultural Workers Organizi ...
organized
Mexican American Mexican Americans ( es, mexicano-estadounidenses, , or ) are Americans of full or partial Mexican heritage. In 2019, Mexican Americans comprised 11.3% of the US population and 61.5% of all Hispanic and Latino Americans. In 2019, 71% of Mexica ...
grape pickers into a
union Union commonly refers to: * Trade union, an organization of workers * Union (set theory), in mathematics, a fundamental operation on sets Union may also refer to: Arts and entertainment Music * Union (band), an American rock group ** ''Un ...
, the National Farmworkers Association (NFWA), to improve their working conditions. This organizing took place primarily in the Central Valley because of the extensive agriculture, especially in and around
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 ...
.


Utilities

The state water project's
Oroville Dam Oroville Dam is an earthfill embankment dam on the Feather River east of the city of Oroville, California, in the Sierra Nevada foothills east of the Sacramento Valley. At 770 feet (235 m) high, it is the tallest dam in the U.S. and serv ...
in the Sacramento Valley provides water and power for the
California Aqueduct The Governor Edmund G. Brown California Aqueduct is a system of canals, tunnels, and pipelines that conveys water collected from the Sierra Nevada Mountains and valleys of Northern and Central California to Southern California. Named after Cali ...
in the San Joaquin Valley. The aqueduct runs from Clifton Court Forebay in the Delta southwards across the
Transverse Ranges The Transverse Ranges are a group of mountain ranges of southern California, in the Pacific Coast Ranges physiographic region in North America. The Transverse Ranges begin at the southern end of the California Coast Ranges and lie within Santa B ...
. The Central Valley Project includes numerous facilities between
Shasta Dam Shasta Dam (called Kennett Dam before its construction) is a concrete arch-gravity dam across the Sacramento River in Northern California in the United States. At high, it is the eighth-tallest dam in the United States. Located at the north e ...
in the north and Bakersfield in the south.
Pacific Gas and Electric The Pacific Gas and Electric Company (PG&E) is an American investor-owned utility (IOU). The company is headquartered in the Pacific Gas & Electric Building, in San Francisco, California. PG&E provides natural gas and electricity to 5.2 milli ...
,
Western Area Power Administration As one of the four power marketing administrations within the U.S. Department of Energy, the Western Area Power Administration (WAPA)'s role is to market wholesale hydropower generated at 57 hydroelectric federal dams operated by the Bureau of R ...
, and
Southern California Edison Southern California Edison (or SCE Corp), the largest subsidiary of Edison International, is the primary electricity supply company for much of Southern California. It provides 15 million people with electricity across a service territory of app ...
built an interconnected
electric grid An electrical grid is an interconnected network for electricity delivery from producers to consumers. Electrical grids vary in size and can cover whole countries or continents. It consists of:Kaplan, S. M. (2009). Smart Grid. Electrical Power ...
connecting the north and south ends of the Central Valley.


See also

*
List of regions of California This is a list of regions of California, organized by location. Northern California Central California *Central California *Central Coast of California, Central Coast (North) **Big Sur **Monterey Bay **Salinas Valley **Santa Cruz Mountains *Dia ...
* Central Valley groundwater pollution *
Lake Corcoran Lake Corcoran (also known as Lake Clyde, after Clyde Wahrhaftig, an American geophysicist) is an ancient lake that covered the Central Valley of California. The lake existed in the valleys of the Sacramento River and the San Joaquin River, at ...
* Orland Buttes


Notes


References


External links

* https://www.ncdc.noaa.gov/news/drought-monitoring-economic-environmental-and-social-impacts * https://yaleclimateconnections.org/2021/06/california-americas-garden-is-drying-out/
Central Valley Tourism Association

CA Central Valley & Foothills
project area of th
American Land Conservancy

Great Valley Center

''The Big Valley'' series
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