Santa Ana River
The Santa Ana River is the largest river within Southern California in the United States. It rises in the San Bernardino Mountains and flows for most of its length through San Bernardino and Riverside Counties, before cutting through the northern Santa Ana Mountains via Santa Ana Canyon and flowing southwest through urban Orange County to drain into the Pacific Ocean; the Santa Ana River is 96 miles long, its drainage basin is 2,650 square miles in size. The Santa Ana drainage basin has a diversity of terrain, ranging from high peaks of inland mountains in the north and east, to the hot, dry interior and semi-desert basins of the Inland Empire, to the flat coastal plain of Orange County. Although it includes areas of alpine and highland forest, the majority of the watershed consists of arid desert and chaparral environments. Due to low regional rainfall, the river carries only a small flow except during the brief winter season, when it is prone to massive flash floods; the San Jacinto River, which drains the southern half of the watershed reaches the Santa Ana except in wet years.
However, a wide variety of animal and plant communities depend on the riparian zones and remnant wetlands along the Santa Ana River. Humans have lived on the Santa Ana River for at least 9,000 years. In the period before and during European colonization, there were four distinct indigenous groups in the area; the river was first seen by Europeans in 1769, when it received its name from members of the Spanish Portola expedition. Because it was one of the only reliable sources of water in a wide region, many large ranchos developed along the river and one of its major tributaries, Santiago Creek. After the area became part of the United States, the economy transitioned to agriculture, before urbanizing in the 20th century. Many cities established during this time including Santa Ana and Anaheim derived their names from the river. In order to protect urban areas from the river's flood threat, major channelization and damming projects were undertaken in the 20th century, resulting in the loss of much of the natural river channel.
The Santa Ana River rises in the southern San Bernardino Mountains, at the confluence of two tiny streams, Heart Bar Creek and Coon Creek, at an elevation of 6,991 feet. Its highest sources are Dollar Lake, at 9,288 feet, Dry Lake, at 9,068 feet, both on the northern flank of San Gorgonio Mountain, at the headwaters of the South Fork Santa Ana River; the river flows west through a wide and forested mountain valley. About 18 miles from its headwaters, it receives its first major tributary, Bear Creek, which enters from the north. Bear Creek receives its water from a popular recreational mountain lake; the river turns south, passing through the Seven Oaks Dam, reaches the arid Inland Empire lowland covering large parts of San Bernardino County and Riverside County. It receives Mill Creek from the south and passes to the south of San Bernardino receives City Creek from the north and San Timoteo Creek from the south. Due to water diversions for groundwater recharge, the river bed is dry in this stretch between Mill Creek and the outlet of the Veolia water treatment plant north of Riverside, which restores a year-round flow.
From there to Prado Dam the river supports a riparian zone with considerable greenery. Not far below the confluence with San Timoteo Creek, Lytle Creek enters from the north. Lytle Creek is one of the largest tributaries of the Santa Ana river, rising from three forks in the San Gabriel Mountains and flowing southeast, before emptying into the Santa Ana River as Lytle Creek Wash. From there, the river turns southwest, after passing through western Riverside, it discharges into the dry flood control reservoir formed by Prado Dam. Two major tributaries of the river join in the reservoir area: Chino Creek from the north, Temescal Creek from the south. Temescal Creek drains the largest area of all the tributaries, because it provides the outflow from Lake Elsinore, into which the San Jacinto River flows, it is one of the longest, at 32 miles in length. Except during the wettest years when Lake Elsinore fills high enough to overflow, Temescal Creek contributes little to no water into the Santa Ana River.
Below Prado Dam, the Santa Ana River crosses into Orange County, cuts between the Santa Ana Mountains and Chino Hills via the narrow Santa Ana Canyon. The river bisects the county as it flows southwest towards the ocean. In Anaheim, the entire flow of the river is diverted into spreading grounds for groundwater recharge of the north Orange County aquifer, providing about half of the county's municipal water supply. Downstream of there, the river is confined to a concrete channel, serving only for flood control and urban runoff drainage, is dry or a small trickle. At Orange it receives Santiago Creek from the east before entering Santa Ana. After crossing under Interstate 5 it passes through the River View Golf Course, one of its few non-concreted sections within Orange County, becomes a concrete channel again through most of Santa Ana and Fountain Valley to a point below the 405 Freeway, where the river bed becomes natural; the mouth of the river is located in a small tidal lagoon between Huntington Beach and Newport Beach, at the northern end of Santa Ana River County Beach.
The Santa Ana River drains the largest watershed of California's South Coast region, covering 2,650 square miles in parts of San Bernardino, Riverside and Los Angeles Counties. Although the river does not pass through Los Angeles County, some of its tributaries, including San Antonio Creek extend i
In meteorology, precipitation is any product of the condensation of atmospheric water vapor that falls under gravity. The main forms of precipitation include drizzle, sleet, snow and hail. Precipitation occurs when a portion of the atmosphere becomes saturated with water vapor, so that the water condenses and "precipitates", thus and mist are not precipitation but suspensions, because the water vapor does not condense sufficiently to precipitate. Two processes acting together, can lead to air becoming saturated: cooling the air or adding water vapor to the air. Precipitation forms as smaller droplets coalesce via collision with other rain drops or ice crystals within a cloud. Short, intense periods of rain in scattered locations are called "showers."Moisture, lifted or otherwise forced to rise over a layer of sub-freezing air at the surface may be condensed into clouds and rain. This process is active when freezing rain occurs. A stationary front is present near the area of freezing rain and serves as the foci for forcing and rising air.
Provided necessary and sufficient atmospheric moisture content, the moisture within the rising air will condense into clouds, namely stratus and cumulonimbus. The cloud droplets will grow large enough to form raindrops and descend toward the Earth where they will freeze on contact with exposed objects. Where warm water bodies are present, for example due to water evaporation from lakes, lake-effect snowfall becomes a concern downwind of the warm lakes within the cold cyclonic flow around the backside of extratropical cyclones. Lake-effect snowfall can be locally heavy. Thundersnow is possible within lake effect precipitation bands. In mountainous areas, heavy precipitation is possible where upslope flow is maximized within windward sides of the terrain at elevation. On the leeward side of mountains, desert climates can exist due to the dry air caused by compressional heating. Most precipitation is caused by convection; the movement of the monsoon trough, or intertropical convergence zone, brings rainy seasons to savannah climes.
Precipitation is a major component of the water cycle, is responsible for depositing the fresh water on the planet. 505,000 cubic kilometres of water falls as precipitation each year. Given the Earth's surface area, that means the globally averaged annual precipitation is 990 millimetres, but over land it is only 715 millimetres. Climate classification systems such as the Köppen climate classification system use average annual rainfall to help differentiate between differing climate regimes. Precipitation may occur on other celestial bodies, e.g. when it gets cold, Mars has precipitation which most takes the form of frost, rather than rain or snow. Precipitation is a major component of the water cycle, is responsible for depositing most of the fresh water on the planet. 505,000 km3 of water falls as precipitation each year, 398,000 km3 of it over the oceans. Given the Earth's surface area, that means the globally averaged annual precipitation is 990 millimetres. Mechanisms of producing precipitation include convective and orographic rainfall.
Convective processes involve strong vertical motions that can cause the overturning of the atmosphere in that location within an hour and cause heavy precipitation, while stratiform processes involve weaker upward motions and less intense precipitation. Precipitation can be divided into three categories, based on whether it falls as liquid water, liquid water that freezes on contact with the surface, or ice. Mixtures of different types of precipitation, including types in different categories, can fall simultaneously. Liquid forms of precipitation include drizzle. Rain or drizzle that freezes on contact within a subfreezing air mass is called "freezing rain" or "freezing drizzle". Frozen forms of precipitation include snow, ice needles, ice pellets and graupel; the dew point is the temperature to which a parcel must be cooled in order to become saturated, condenses to water. Water vapor begins to condense on condensation nuclei such as dust and salt in order to form clouds. An elevated portion of a frontal zone forces broad areas of lift, which form clouds decks such as altostratus or cirrostratus.
Stratus is a stable cloud deck which tends to form when a cool, stable air mass is trapped underneath a warm air mass. It can form due to the lifting of advection fog during breezy conditions. There are four main mechanisms for cooling the air to its dew point: adiabatic cooling, conductive cooling, radiational cooling, evaporative cooling. Adiabatic cooling occurs when air expands; the air can rise due to convection, large-scale atmospheric motions, or a physical barrier such as a mountain. Conductive cooling occurs when the air comes into contact with a colder surface by being blown from one surface to another, for example from a liquid water surface to colder land. Radiational cooling occurs due to the emission of infrared radiation, either by the air or by the surface underneath. Evaporative cooling occurs when moisture is added to the air through evaporation, which forces the air temperature to cool to its wet-bulb temperature, or until it reaches saturation; the main ways water vapor is added to the air are: wind convergence into areas of upward motion, precipitation or virga falling from above, daytime heating evaporating water from the surface of oceans, water bodies or wet lan
A metropolitan area, sometimes referred to as a metro area or commuter belt, is a region consisting of a densely populated urban core and its less-populated surrounding territories, sharing industry and housing. A metro area comprises multiple jurisdictions and municipalities: neighborhoods, boroughs, towns, suburbs, districts and nations like the eurodistricts; as social and political institutions have changed, metropolitan areas have become key economic and political regions. Metropolitan areas include one or more urban areas, as well as satellite cities and intervening rural areas that are socioeconomically tied to the urban core measured by commuting patterns. In the United States, the concept of the metropolitan statistical area has gained prominence. Metropolitan areas may themselves be part of larger megalopolises. For urban centres outside metropolitan areas, that generate a similar attraction at smaller scale for their region, the concept of the regiopolis and regiopolitan area or regio was introduced by German professors in 2006.
In the United States, the term micropolitan statistical area is used. A metropolitan area combines an urban agglomeration with zones not urban in character, but bound to the center by employment or other commerce; these outlying zones are sometimes known as a commuter belt, may extend well beyond the urban zone, to other political entities. For example, New York on Long Island is considered part of the New York metropolitan area. In practice, the parameters of metropolitan areas, in both official and unofficial usage, are not consistent. Sometimes they are little different from an urban area, in other cases they cover broad regions that have little relation to a single urban settlement. Population figures given for one metro area can vary by millions. There has been no significant change in the basic concept of metropolitan areas since its adoption in 1950, although significant changes in geographic distributions have occurred since and more are expected; because of the fluidity of the term "metropolitan statistical area," the term used colloquially is more "metro service area," "metro area," or "MSA" taken to include not only a city, but surrounding suburban and sometimes rural areas, all which it is presumed to influence.
A polycentric metropolitan area contains multiple urban agglomerations not connected by continuous development. In defining a metropolitan area, it is sufficient that a city or cities form a nucleus with which other areas have a high degree of integration. See the many lists of metropolitan areas itemized at § Lists of metropolitan areas; the Australian Bureau of Statistics defines Greater Capital City Statistical Areas as the areas of functional extent of the seven state capitals and the Australian Capital Territory. GCCSAs replaced "Statistical Divisions" used until 2011. In Brazil, metropolitan areas are called "metropolitan regions"; each State defines its own legislation for the creation and organization of a metropolitan region. The creation of a metropolitan region is not intended for any statistical purpose, although the Brazilian Institute of Geography and Statistics uses them in its reports, their main purpose is to allow for a better management of public policies of common interest to all cities involved.
They don't have political, electoral or jurisdictional power whatsoever, so citizens living in a metropolitan region do not elect representatives for them. Statistics Canada defines a census metropolitan area as an area consisting of one or more adjacent municipalities situated around a major urban core. To form a CMA, the metropolitan area must have a population of at least 100,000, at least half within the urban core. To be included in the CMA, adjacent municipalities must have a high degree of integration with the core, as measured by commuter flows derived from census data. In Chinese, there used to be no clear distinction between "megalopolis" and "metropolitan area" until National Development and Reform Commission issued Guidelines on the Cultivation and Development of Modern Metropolitan Areas on Feb 19, 2019, in which a metropolitan area was defined as "an urbanized spatial form in a megalopolis dominated by supercity or megacity, or a large metropolis playing a leading part, within the basic range of 1-hour commute area."
The European Union's statistical agency, has created a concept named Larger Urban Zone. The LUZ represents an attempt at a harmonised definition of the metropolitan area, the goal was to have an area from a significant share of the resident commute into the city, a concept known as the "functional urban region". France's national statistics institute, the INSEE, names an urban core and its surrounding area of commuter influence an aire urbaine; this statistical method applies to agglomerations of all sizes, but the INSEE sometimes uses the term aire métropolitaine to refer to France's largest aires urbaines. In German definition, metropolian areas are eleven most densely populated areas in the Federal Republic of Germany, they comprise the major German cities and their surrounding catchment areas and form the political and cultural centres of the country. For urban centres outside metropolitan areas, that generate a similar attraction at smaller scale for their region, the concept of the Regiopolis and regiopolitan area or regio was introduced by German professors in 2006.
In India, a metropolitan city is defin
United States Census Bureau
The United States Census Bureau is a principal agency of the U. S. Federal Statistical System, responsible for producing data about the American people and economy; the Census Bureau is part of the U. S. Department of Commerce and its director is appointed by the President of the United States; the Census Bureau's primary mission is conducting the U. S. Census every ten years, which allocates the seats of the U. S. House of Representatives to the states based on their population; the Bureau's various censuses and surveys help allocate over $400 billion in federal funds every year and it helps states, local communities, businesses make informed decisions. The information provided by the census informs decisions on where to build and maintain schools, transportation infrastructure, police and fire departments. In addition to the decennial census, the Census Bureau continually conducts dozens of other censuses and surveys, including the American Community Survey, the U. S. Economic Census, the Current Population Survey.
Furthermore and foreign trade indicators released by the federal government contain data produced by the Census Bureau. Article One of the United States Constitution directs the population be enumerated at least once every ten years and the resulting counts used to set the number of members from each state in the House of Representatives and, by extension, in the Electoral College; the Census Bureau now conducts a full population count every 10 years in years ending with a zero and uses the term "decennial" to describe the operation. Between censuses, the Census Bureau makes population projections. In addition, Census data directly affects how more than $400 billion per year in federal and state funding is allocated to communities for neighborhood improvements, public health, education and more; the Census Bureau is mandated with fulfilling these obligations: the collecting of statistics about the nation, its people, economy. The Census Bureau's legal authority is codified in Title 13 of the United States Code.
The Census Bureau conducts surveys on behalf of various federal government and local government agencies on topics such as employment, health, consumer expenditures, housing. Within the bureau, these are known as "demographic surveys" and are conducted perpetually between and during decennial population counts; the Census Bureau conducts economic surveys of manufacturing, retail and other establishments and of domestic governments. Between 1790 and 1840, the census was taken by marshals of the judicial districts; the Census Act of 1840 established a central office. Several acts followed that revised and authorized new censuses at the 10-year intervals. In 1902, the temporary Census Office was moved under the Department of Interior, in 1903 it was renamed the Census Bureau under the new Department of Commerce and Labor; the department was intended to consolidate overlapping statistical agencies, but Census Bureau officials were hindered by their subordinate role in the department. An act in 1920 changed the date and authorized manufacturing censuses every two years and agriculture censuses every 10 years.
In 1929, a bill was passed mandating the House of Representatives be reapportioned based on the results of the 1930 Census. In 1954, various acts were codified into Title 13 of the US Code. By law, the Census Bureau must count everyone and submit state population totals to the U. S. President by December 31 of any year ending in a zero. States within the Union receive the results in the spring of the following year; the United States Census Bureau defines four statistical regions, with nine divisions. The Census Bureau regions are "widely used...for data collection and analysis". The Census Bureau definition is pervasive. Regional divisions used by the United States Census Bureau: Region 1: Northeast Division 1: New England Division 2: Mid-Atlantic Region 2: Midwest Division 3: East North Central Division 4: West North Central Region 3: South Division 5: South Atlantic Division 6: East South Central Division 7: West South Central Region 4: West Division 8: Mountain Division 9: Pacific Many federal, state and tribal governments use census data to: Decide the location of new housing and public facilities, Examine the demographic characteristics of communities and the US, Plan transportation systems and roadways, Determine quotas and creation of police and fire precincts, Create localized areas for elections, utilities, etc.
Gathers population information every 10 years The United States Census Bureau is committed to confidentiality, guarantees non-disclosure of any addresses or personal information related to individuals or establishments. Title 13 of the U. S. Code establishes penalties for the disclosure of this information. All Census employees must sign an affidavit of non-disclosure prior to employment; the Bureau cannot share responses, addresses or personal information with anyone including United States or foreign government
A ZIP Code is a postal code used by the United States Postal Service in a system it introduced in 1963. The term ZIP is an acronym for Zone Improvement Plan; the basic format consists of five digits. An extended ZIP+4 code was introduced in 1983 which includes the five digits of the ZIP Code, followed by a hyphen and four additional digits that reference a more specific location; the term ZIP Code was registered as a servicemark by the U. S. Postal Service, but its registration has since expired; the early history and context of postal codes began with postal district/zone numbers. The United States Post Office Department implemented postal zones for numerous large cities in 1943. For example: The "16" was the number of the postal zone in the specific city. By the early 1960s, a more organized system was needed, non-mandatory five-digit ZIP Codes were introduced nationwide on July 1, 1963; the USPOD issued its Publication 59: Abbreviations for Use with ZIP Code on October 1, 1963, with the list of two-letter state abbreviations which are written with both letters capitalized.
An earlier list in June had proposed capitalized abbreviations ranging from two to five letters. According to Publication 59, the two-letter standard was "based on a maximum 23-position line, because this has been found to be the most universally acceptable line capacity basis for major addressing systems", which would be exceeded by a long city name combined with a multi-letter state abbreviation, such as "Sacramento, Calif." along with the ZIP Code. The abbreviations have remained unchanged, with the exception of Nebraska, changed from NB to NE in 1969 at the request of the Canadian postal administration, to avoid confusion with the Canadian province of New Brunswick. Robert Moon is considered the father of the ZIP Code; the post office only credits Moon with the first three digits of the ZIP Code, which describe the sectional center facility or "sec center." An SCF is a central mail processing facility with those three digits. The fourth and fifth digits, which give a more precise locale within the SCF, were proposed by Henry Bentley Hahn Sr.
The SCF sorts mail to all post offices with those first three digits in their ZIP Codes. The mail is sorted according to the final two digits of the ZIP Code and sent to the corresponding post offices in the early morning. Sectional centers do not deliver mail and are not open to the public, most of their employees work the night shift. Mail picked up at post offices is sent to their own SCF in the afternoon, where the mail is sorted overnight. In the case of large cities, the last two digits coincide with the older postal zone number thus: In 1967, these became mandatory for second- and third-class bulk mailers, the system was soon adopted generally; the United States Post Office used a cartoon character, which it called Mr. ZIP, to promote the use of the ZIP Code, he was depicted with a legend such as "USE ZIP CODE" in the selvage of panes of postage stamps or on the covers of booklet panes of stamps. In 1971 Elmira Star-Gazette reporter Dick Baumbach found out the White House was not using a ZIP Code on its envelopes.
Herb Klein, special assistant to President Nixon, responded by saying the next printing of envelopes would include the ZIP Code. In 1983, the U. S. Postal Service introduced an expanded ZIP Code system that it called ZIP+4 called "plus-four codes", "add-on codes", or "add-ons". A ZIP+4 Code uses the basic five-digit code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a city block, a group of apartments, an individual high-volume receiver of mail, a post office box, or any other unit that could use an extra identifier to aid in efficient mail sorting and delivery. However, initial attempts to promote universal use of the new format met with public resistance and today the plus-four code is not required. In general, mail is read by a multiline optical character reader that instantly determines the correct ZIP+4 Code from the address—along with the more specific delivery point—and sprays an Intelligent Mail barcode on the face of the mail piece that corresponds to 11 digits—nine for the ZIP+4 Code and two for the delivery point.
For Post Office Boxes, the general rule is. The add-on code is one of the following: the last four digits of the box number, zero plus the last three digits of the box number, or, if the box number consists of fewer than four digits, enough zeros are attached to the front of the box number to produce a four-digit number. However, there is no uniform rule, so the ZIP+4 Code must be looked up individually for each box; the ZIP Code is translated into an Intelligent Mail barcode, printed on the mailpiece to make it easier for automated machines to sort. A barcode can be printed by the sender, it is better to let the post office put one on. In general, the post office uses OCR technology, though in some cases a human might have to read and enter the address. Customers who send bulk mail can get a discount on postage if they have printed the barcode themselves and have presorted the mai
In political science, an initiative is a means by which a petition signed by a certain minimum number of registered voters can force a public vote in parliament called an indirect initiative or via a direct initiative, the latter being dubbed a Popular initiated Referendum. The initiative can be rejected by the parliament, but it can be forced to see the proposition put to a referendum; the initiative may take the form of a direct initiative or an indirect initiative. In a direct initiative, a measure is put directly to a referendum after being submitted by a petition. In an indirect initiative, a measure is first referred to the legislature, put to a popular vote only if not enacted by the legislature; the vote may be on a proposed federal level, constitutional amendment, charter amendment or local ordinance, or to oblige the executive or legislature to consider the subject by submitting it to the order of the day. It is a form of direct democracy. A direct initiative is when an initiative measure, either an initiated state statute or initiated constitutional amendment, is placed directly on the ballot for voters to reject or pass.
The measure is not first submitted to the legislature. An indirect initiative refers to a process where after sufficient signatures are collected, the measure is voted on by a parliament. In Brazil, a popular law initiative requires two conditions be met before it is sent to the National Congress: signatures from at least 1% of national registered voters and at least 0.3% of the people allowed to vote from each of at least five of the 27 federal unities. If both conditions are met, Congress is obliged to vote on holding the initiative; the Canadian province of British Columbia has a citizen initiative law known as the Recall and Initiative Act. The original proposal was put to voters in a referendum held in October 1991 and was supported by over 83% of voters, it was subsequently put into force by the incoming NDP government. Since it came into force in 1995, several attempts have been made to hold an initiative, but until the fall of 2010, none had succeeded in reaching the first of the thresholds, securing signatures of 10% of registered voters in each riding throughout British Columbia.
The first referendum was held under this legislation on September 2011 on the subject of repealing the Harmonized Sales Tax. Details of its use in BC are available on the Elections BC website; the rejected Treaty establishing a Constitution for Europe included a limited indirect initiative right. The proposal of introducing the European Citizens' Initiative was that 1,000,000 citizens, from minimal numbers of different member states, could invite the executive body of the European Union, the European Commission, to consider any proposal "on matters where citizens consider that a legal act of the Union is required for the purpose of implementing the Constitution." The precise mechanism had not been agreed upon. Critics underlined the weakness of this right of initiative, which did not entail any vote or referendum. A similar scheme under the same name, European Citizens' Initiative, has been put forward in the now ratified European Lisbon Treaty, enabling a limited indirect initiative right, it follows similar rules to the ones outlined in the European Constitution, requiring the signatures of 1,000 000 European Nationals.
These citizens would thereby obtain the same right to request the Commission to submit a legislative proposal as the Council has had since the establishment of the European Communities in 1957. This, does require that the signatures come from a "significant number" of Member States, it is suggested that this significant number will need to be around a quarter of member states, with at least 1/500 of the citizens in those member states supporting the initiative. With the variety of languages within the European Union, this creates a significant hurdle for people to navigate; the treaty makes it clear that right of initiative should not be confused with the right to petition since a petition is directed to Parliament while a citizens' initiative is directed to the Commission. In 2013 the subjects of ongoing open initiatives of the European Citizens' Initiative are e.g. about "water and sanitation as a human right", "30 km/h - making the streets liveable!", "Unconditional Basic Income", or to "End Ecocide in Europe".
It remains to be seen if the ECI evolves into a full initiative or remains in its present state of a de facto petition. Since March 1, 2012, groups of at least 50,000 Finnish citizens with suffrage have had the constitutional right to send a citizens' initiative to the Parliament of Finland. A limited, indirect form of local initiative was added to the French Constitution on 28 March 2003 as part of decentralization reforms. However, the only power these "local referendum initiatives" confer on citizens is the ability to add propositions to their local assembly's meeting agenda; the decision as to whether to submit citizen propositions to a popular vote rests with the local assembly. A citizens' initiative referendum was proposed by the yellow vests movement. All German states have the right to initiative
Riverside County, California
Riverside County is one of fifty-eight counties in the U. S. state of California. As of the 2010 census, the population was 2,189,641, making it the 4th-most populous county in California and the 11th-most populous in the United States; the name was derived from the city of Riverside, the county seat. Riverside County is included in the Riverside-San Bernardino-Ontario, CA Metropolitan Statistical Area known as the Inland Empire; the county is included in the Los Angeles-Long Beach, CA Combined Statistical Area. There is a high concentration of sprawling tract housing communities around Riverside and along the Interstate 10, 15, 215 freeways. Rectangular, Riverside County covers 7,208 square miles in Southern California, spanning from the Greater Los Angeles area to the Arizona border. Geographically, the county is desert in the central and eastern portions, but has a Mediterranean climate in the western portion. Most of Joshua Tree National Park is located in the county; the resort cities of Palm Springs, Palm Desert, Indian Wells, La Quinta, Rancho Mirage, Desert Hot Springs are all located in the Coachella Valley region of central Riverside County.
Large numbers of Los Angeles area workers have moved to the county in recent years to take advantage of affordable housing. Along with neighboring San Bernardino County, it was one of the fastest growing regions in the state prior to the recent changes in the regional economy. In addition, but significant, numbers of people have been moving into Southwest Riverside County from the San Diego-Tijuana metropolitan area; the cities of Temecula and Murrieta accounted for 20% of the increase in population of the county between 2000 and 2007. Riverside County was named for the Santa Ana River in 1870; the indigenous peoples of what is now Riverside County are Cupeño and Cahuilla Indians. The Luiseño lived in the Aguanga and Temecula Basins, Elsinore Trough and eastern Santa Ana Mountains and southward into San Diego County; the Cahuilla lived to the east and north of the Luiseño in the inland valleys, in the Santa Rosa and San Jacinto Mountains and the desert of the Salton Sink. The first European settlement in the county was a Mission San Luis Rey de Francia estancia or farm, at the Luiseño village of Temecula.
Grain and grapes were grown here. In 1819, the Mission granted land to Leandro Serrano, mayordomo of San Antonio de Pala Asistencia for the Mission of San Luis Rey for Rancho Temescal. Following Mexican independence and the 1833 confiscation of Mission lands, more ranchos were granted. Rancho Jurupa in 1838, El Rincon in 1839, Rancho San Jacinto Viejo in 1842, Rancho San Jacinto y San Gorgonio in 1843, Ranchos La Laguna, Temecula in 1844, Ranchos Little Temecula, Potreros de San Juan Capistrano in 1845, Ranchos San Jacinto Sobrante, La Sierra, La Sierra, Santa Rosa and San Jacinto Nuevo y Potrero in 1846. New Mexican colonists founded the town of La Placita on the east side of the Santa Ana River at the northern extremity of what is now the city of Riverside in 1843; when the initial 27 California counties were established in 1850, the area today known as Riverside County was divided between Los Angeles County and San Diego County. In 1853, the eastern part of Los Angeles County was used to create San Bernardino County.
Between 1891 and 1893, several proposals and legislative attempts were put forth to form new counties in Southern California. These proposals included one for one for a San Jacinto County. None of the proposals were adopted until a measure to create Riverside County was signed by Governor Henry H. Markham on March 11, 1893; the new county was created from parts of San Diego County. On May 2, 1893, seventy percent of voters approved the formation of Riverside County. Voters chose the city of Riverside as the county seat by a large margin. Riverside County was formed on May 9, 1893, when the Board of Commissioners filed the final canvass of the votes. Riverside County is the birthplace of lane markings, thanks to Dr. June McCarroll in 1915 when she suggested her idea to the state government; the county is the location of the March Air Reserve Base, one of the oldest airfields continuously operated by the United States military. Established as the Alessandro Flying Training Field in February 1918, it was one of thirty-two U.
S. Army Air Service training camps established after the United States entry into World War I in April 1917; the airfield was renamed March Field the following month for 2d Lieutenant Peyton C. March, Jr. the deceased son of the then-Army Chief of Staff, General Peyton C. March, killed in an air crash in Texas just fifteen days after being commissioned. March Field remained an active Army Air Service U. S. Army Air Corps installation throughout the interwar period becoming a major installation of the U. S. Army Air Forces during World War II. Renamed March Air Force Base in 1947 following the establishment of the U. S. Air Force, it was a major Strategic Air Command installation throughout the Cold War. In 1996, it was transferred to the Air Force Reserve Command and gained its current name as a major base for the Air Force Reserve and the California Air National Guard. Riverside county was a major focal point of the Civil Rights Movements in the US the African-American sections of Riverside and Mexican-American communities of the Coachella Valley visited by Cesar Chavez of the farm labor union struggle.
Riverside county has been a focus of modern Native American Gaming enterprises. In the early 1980s, the county government attempted to shut down small bingo halls operated by the Morongo Band of Cahuilla Mission In