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67-578: The reservoir was constructed by building a large earthfill dam across the northern side of the basin. Two smaller dams, called dikes, were built during the 1961 (63 years ago)  ( 1961 ) expansion to increase the lake's capacity. Originally named the Cajalco Reservoir, the reservoir is now named after W.B. Mathews , an attorney who was a key architect of the MWD and its business relationships with member water agencies. Construction on

134-404: A Pomona County and 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 Bernardino County and San Diego County . On May 2, 1893, seventy percent of voters approved the formation of Riverside County. Voters chose the city of Riverside as

201-409: A dam is composed of fragmented independent material particles. The friction and interaction of particles binds the particles together into a stable mass rather than by the use of a cementing substance. Embankment dams come in two types: the earth-filled dam (also called an earthen dam or terrain dam ) made of compacted earth, and the rock-filled dam . A cross-section of an embankment dam shows

268-572: A population of 2,189,641. The racial makeup of Riverside County was 1,335,147 (61.0%) White (40.7% Non-Hispanic White), 140,543 (6.4%) African American , 23,710 (1.1%) Native American , 130,468 (6.0%) Asian (2.3% Filipino, 0.8% Chinese, 0.7% Vietnamese, 0.6% Korean, 0.5% Indian, 0.2% Japanese, 0.1% Cambodian, 0.1% Laotian, 0.1% Pakistani), 6,874 (0.3%) Pacific Islander , 448,235 (20.5%) from other races , and 104,664 (4.8%) from two or more races. There were 995,257 residents of Hispanic or Latino ancestry, of any race (45.5%); 39.5% of Riverside County

335-615: A rock-fill dam is New Melones Dam in California or the Fierza Dam in Albania . A core that is growing in popularity is asphalt concrete . The majority of such dams are built with rock and/or gravel as the primary fill. Almost 100 dams of this design have now been built worldwide since the first such dam was completed in 1962. All asphalt-concrete core dams built so far have an excellent performance record. The type of asphalt used

402-562: A rock-fill dam. The frozen-core dam is a temporary earth dam occasionally used in high latitudes by circulating a coolant through pipes inside the dam to maintain a watertight region of permafrost within it. Tarbela Dam is a large dam on the Indus River in Pakistan , about 50 km (31 mi) northwest of Islamabad . Its height of 485 ft (148 m) above the river bed and 95 sq mi (250 km ) reservoir make it

469-411: A shape like a bank, or hill. Most have a central section or core composed of an impermeable material to stop water from seeping through the dam. The core can be of clay, concrete, or asphalt concrete . This type of dam is a good choice for sites with wide valleys. They can be built on hard rock or softer soils. For a rock-fill dam, rock-fill is blasted using explosives to break the rock. Additionally,

536-403: A shell of locally plentiful material with a watertight clay core. Modern zoned-earth embankments employ filter and drain zones to collect and remove seep water and preserve the integrity of the downstream shell zone. An outdated method of zoned earth dam construction used a hydraulic fill to produce a watertight core. Rolled-earth dams may also employ a watertight facing or core in the manner of

603-778: A smoke-belching volcano constructed on one of the lake's islands. After their idea was rejected by the MWD board, the movie's producers reportedly constructed a lagoon and volcano on a studio backlot. In 1960, the Riverside County Board of Supervisors mounted an unsuccessful campaign to open the lake for recreational purposes. The board generated a resolution citing a "pressing and definite need" for recreational facilities in Southern California . California Assemblyman Kevin Jeffries, on February 14, 2012, introduced legislation, AB 1686, which would have opened

670-475: A week, with a primarily commuter-oriented schedule. Riverside County has 12 federally recognized Indian reservations , which ties it with Sandoval County, New Mexico , for second most of any county in the United States. (Sandoval County, however, has two additional joint-use areas, shared between reservations. San Diego County, California has the most, with 18 reservations.) The population ranking of

737-577: Is a county located in the southern portion of the U.S. state of California . As of the 2020 census , the population was 2,418,185, making it the fourth-most populous county in California and the 10th-most populous in the United States. The name was derived from the city of Riverside , which is the county seat . Riverside County is included in the Riverside– San Bernardino – Ontario Metropolitan Statistical Area , also known as

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804-548: Is a viscoelastic - plastic material that can adjust to the movements and deformations imposed on the embankment as a whole, and to settlement of the foundation. The flexible properties of the asphalt make such dams especially suited to earthquake regions. For the Moglicë Hydro Power Plant in Albania the Norwegian power company Statkraft built an asphalt-core rock-fill dam. Upon completion in 2018

871-486: Is at hand, transport is minimized, leading to cost savings during construction. Rock-fill dams are resistant to damage from earthquakes . However, inadequate quality control during construction can lead to poor compaction and sand in the embankment which can lead to liquefaction of the rock-fill during an earthquake. Liquefaction potential can be reduced by keeping susceptible material from being saturated, and by providing adequate compaction during construction. An example of

938-765: Is at the southernmost part of its range in Riverside County. There are 19 official wilderness areas in Riverside County that are part of the National Wilderness Preservation System . Some are integral parts of the above protected areas, most (11 of the 19) are managed solely by the Bureau of Land Management , and some share management between the BLM and the relevant other agencies. Some extend into neighboring counties: The 2010 United States Census reported that Riverside County had

1005-983: Is now Riverside County are the Serrano , the Payómkawichum , the Mohave , the Cupeno , the Chemehuevi , the Cahuilla , and the Tongva . The Aguanga and Temecula Basins, Elsinore Trough and eastern Santa Ana Mountains are the traditional homelands of the Payómkawichum. The inland valleys in the Santa Rosa and San Jacinto Mountains and the desert of the Salton Sink are the traditional homelands of

1072-441: Is of greatest importance as its outlet feeds directly into pipelines that connect to member water agencies serving 8.4 million people. During its existence, a number of attempts have been made to gain access to the lake for various purposes, but none have been granted. One of the most interesting was a 1952 request for a movie shoot at the lake. The scene from the 1953 movie Fair Wind to Java would have featured, among other things,

1139-629: Is the Riverside Historic Courthouse. This landmark, erected in 1903, was modeled after the Grand and Petit Palais in Paris, France . The courthouse, designed by Los Angeles architects Burnham and Bliesner, has a classical design – including a great hall that connects all the departments ( courtrooms ). In 1994, the courthouse was closed for seismic retrofits due to the 1992 Landers and 1994 Northridge earthquakes . The courthouse

1206-465: Is the state trial court for Riverside County with 14 courthouses : Riverside Historic Courthouse , Riverside Hall of Justice, Riverside Family Law Court, Riverside Juvenile Court, Southwest Justice Center – Murrieta, Moreno Valley Court, Banning Court, Hemet Court, Corona Court, Temecula Court, Larson Justice Center – Indio, Indio Juvenile Court, Palm Springs Court and Blythe Court. The main courthouse

1273-525: The California Gold Rush in the 1860s when miners constructed rock-fill timber-face dams for sluice operations . The timber was later replaced by concrete as the design was applied to irrigation and power schemes. As CFRD designs grew in height during the 1960s, the fill was compacted and the slab's horizontal and vertical joints were replaced with improved vertical joints. In the last few decades, design has become popular. The tallest CFRD in

1340-620: The First Mexican Republic , a series of rancho land grants were made throughout the state. In the Riverside County this included; 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 , Pauba , Temecula in 1844, Ranchos Little Temecula , Potreros de San Juan Capistrano in 1845, Ranchos San Jacinto Sobrante , La Sierra (Sepulveda) , La Sierra (Yorba) , Santa Rosa and San Jacinto Nuevo y Potrero in 1846. New Mexican colonists founded

1407-717: The Inland Empire western portion, the Santa Rosa Mountains communities such as Reinhardt Canyon , and the desert region. Other possible subdivisions include tribal lands, the Colorado River communities, and the Salton Sea . There is a diversity of flora and fauna within Riverside County. Vegetative plant associations feature many desert flora, but there are also forested areas within the county. The California endemic Blue oak , Quercus douglasii

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1474-539: The Inland Empire . The county is also included in the Los Angeles – Long Beach Combined Statistical Area . Roughly rectangular, Riverside County covers 7,208 square miles (18,670 km ) in Southern California , spanning from the greater Los Angeles area to the Arizona border. Geographically, the western region of the county is chaparral with a Mediterranean climate , while the central and eastern regions of

1541-399: The U.S. Census Bureau , the county has a total area of 7,303 square miles (18,910 km ), of which 7,206 square miles (18,660 km ) is land and 97 square miles (250 km ) (1.3%) is water. It is the fourth-largest county in California by area. At roughly 180 miles (290 km) wide in the east–west dimension, the area of the county is massive. Riverside County, California is roughly

1608-726: The United States House of Representatives , Riverside County is split between 6 congressional districts: In the California State Senate , the county is split between four legislative districts: In the California State Assembly , the county is split between six legislative districts: Riverside County voted 64.8% in favor of Proposition 8 which amended the California Constitution to ban same-sex marriages. Only

1675-577: The Usoi landslide dam leaks 35-80 cubic meters per second. Sufficiently fast seepage can dislodge a dam's component particles, which results in faster seepage, which turns into a runaway feedback loop that can destroy the dam in a piping-type failure. Seepage monitoring is therefore an essential safety consideration. gn and Construction in the U.S. Bureau of Reclamation Riverside County 33°44′N 115°59′W  /  33.73°N 115.98°W  / 33.73; -115.98 Riverside County

1742-543: The 320 m long, 150 m high and 460 m wide dam is anticipated to be the world's highest of its kind. A concrete-face rock-fill dam (CFRD) is a rock-fill dam with concrete slabs on its upstream face. This design provides the concrete slab as an impervious wall to prevent leakage and also a structure without concern for uplift pressure. In addition, the CFRD design is flexible for topography, faster to construct and less costly than earth-fill dams. The CFRD concept originated during

1809-579: The Cahuilla. The first European settlement in the county was a Mission San Luis Rey de Francia estancia or farm at the Luiseño village of Temescal. In 1819, the Mission granted Leandro Serrano permission to occupy the land for the purpose of grazing and farming, and Serrano established Rancho Temescal . Serrano was mayordomo of San Antonio de Pala Asistencia for the Mission of San Luis Rey. With

1876-577: The California State Water Resources Control Board found the MWD's interruption of Cajalco Creek water to be in violation of state water code. An out-of-court settlement was reached where MWD would monitor the quantity of water entering Lake Mathews from the creek and release 1.3 times that amount, minus dam seepage, into the Santa Ana River. In addition, MWD was ordered to contribute $ 50,000 to aid in

1943-460: The Colorado River in February 1940, and water deliveries began in 1941. In 1961, the reservoir's capacity was nearly doubled to its current capacity of 182,000 acre-feet. In the mid-2000s, a large project was undertaken to rehabilitate the old outlet tower and construct a new tower as an alternative. The MWD was concerned about the tower's susceptibility to earthquakes, and age had rendered many of

2010-584: The County Board of Supervisors approved a multimillion-dollar planning effort to create the Riverside County Integrated Plan (RCIP) which was to encompass a completely new General Plan, regional transportation plan (CETAP) and Habitat Conservation Plan. The resultant General Plan adopted in 2003 was considered groundbreaking for its multidisciplinary approach to land use and conservation planning. The Riverside Superior Court

2077-418: The age of 18 living with them, 56.5% were married couples living together, 12.0% had a female householder with no husband present, and 26.4% were non-families. 20.7% of all households were made up of individuals, and 9.3% had someone living alone who was 65 years of age or older. The average household size was 3.0 and the average family size was 3.5. In the county, the population was spread out, with 30.3% under

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2144-462: The age of 18, 9.2% from 18 to 24, 28.9% from 25 to 44, 18.9% from 45 to 64, and 12.7% who were 65 years of age or older. The median age was 33 years. For every 100 females, there were 99.1 males. For every 100 females age 18 and over, there were 96.8 males. The median income for a household in the county was $ 42,887, and the median income for a family was $ 48,409. Males had a median income of $ 38,639 versus $ 28,032 for females. The per capita income for

2211-404: The base of the dam than at shallower water levels. Thus the stress level of the dam must be calculated in advance of building to ensure that its break level threshold is not exceeded. Overtopping or overflow of an embankment dam beyond its spillway capacity will cause its eventual failure . The erosion of the dam's material by overtopping runoff will remove masses of material whose weight holds

2278-454: The bill would have likely resulted in prolonged and expensive legal battles. Embankment dam An embankment dam is a large artificial dam . It is typically created by the placement and compaction of a complex semi- plastic mound of various compositions of soil or rock. It has a semi-pervious waterproof natural covering for its surface and a dense, impervious core. This makes the dam impervious to surface or seepage erosion . Such

2345-716: The cities and towns of Coachella, Eastvale, Indian Wells, Jurupa Valley, La Quinta, Lake Elsinore, Moreno Valley, Norco, Palm Desert, Perris, Rancho Mirage, San Jacinto, Temecula and Wildomar. The Morongo Indian Reservation also contracts with the Sheriff's Office to provide police services to the reservation. Municipal departments within the county are Banning, Beaumont, Blythe, Calimesa, Cathedral City, Corona, Desert Hot Springs, Hemet, Indio, Menifee, Murrieta, Palm Springs, Riverside, Riverside Community College Riverside County Probation Department https://rivcoprobation.org/ Chart of voter registration Prior to 2008, Riverside County

2412-1091: The city of Palm Springs voted against the measure. The following table includes the number of incidents reported and the rate per 1,000 persons for each type of offense. K-12 unified: Secondary: Elementary: Amtrak trains stop in Riverside and Palm Springs , and Amtrak California provides bus connections to the San Joaquins in Riverside–Downtown , Beaumont , Palm Springs , Thousand Palms , Indio , Moreno Valley , Perris , Sun City , and Hemet . Metrolink trains serve nine stations in Riverside County: Riverside–Downtown , Riverside–La Sierra , Corona–North Main , Corona–West , Jurupa Valley/Pedley , Riverside–Hunter Park/UCR , Moreno Valley/March Field , Perris–Downtown , and Perris–South . These trains provide service to Orange, San Bernardino and Los Angeles counties seven days

2479-450: The cost of producing or bringing in concrete would be prohibitive. Rock -fill dams are embankments of compacted free-draining granular earth with an impervious zone. The earth used often contains a high percentage of large particles, hence the term "rock-fill". The impervious zone may be on the upstream face and made of masonry , concrete , plastic membrane, steel sheet piles, timber or other material. The impervious zone may also be inside

2546-512: The county are predominantly desert or mountainous. Most of Joshua Tree National Park is located in the county. The desert resort cities of Indio , Coachella , Palm Springs , Palm Desert , Indian Wells , La Quinta , Rancho Mirage , Cathedral City and Desert Hot Springs are located in the Coachella Valley region of central-eastern Riverside County. Between 2007 and 2011, large numbers of Los Angeles -area workers moved to

2613-419: The county had a population of 2,026,803, up 31.2% since 2000. In 2005 45.8% of the population was non-Hispanic whites. The percentages of African Americans, Asians and Native Americans remained relatively similar to their 2000 figures. The percentage of Pacific Islanders had majorly risen to 0.4. Hispanics now constituted 41% of the population. There were 506,218 households, out of which 38.90% had children under

2680-708: The county seat, also by a large margin. Riverside County was officially formed on May 9, 1893, when the Board of Commissioners filed the final canvass of the votes. Riverside county was a major focal point of the Civil Rights Movements in the US, especially the African-American sections of Riverside and heavily Mexican-American communities of the Coachella Valley visited by Cesar Chavez of

2747-490: The county to take advantage of more 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, smaller, but significant, numbers of people have been moving into southwest Riverside County from the San Diego metropolitan area . Riverside County is bordered on the north by San Bernardino County ; on

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2814-493: The county was $ 18,689. About 10.7% of families and 14.2% of the population were below the poverty line , including 18.5% of those under age 18 and 7.6% of those age 65 or over. Riverside County is organized as a General Law County under the provision of the California Government Code. The county has five supervisorial districts, and one supervisor is elected from each district every four years. In 1999,

2881-426: The county was 65.6% White , 6.2% Black or African American , 1.2% Native American , 3.7% Asian , 0.3% Pacific Islander , 18.7% from other races , and 4.4% from two or more races. 36.2% of the population were Hispanic or Latino of any race. 9.2% were of German, 6.9% English, 6.1% Irish and 5.0% American ancestry according to Census 2000 . 67.2% spoke English and 27.7% Spanish as their first language. In 2006

2948-434: The dam in place and against the hydraulic forces acting to move the dam. Even a small sustained overtopping flow can remove thousands of tons of overburden soil from the mass of the dam within hours. The removal of this mass unbalances the forces that stabilize the dam against its reservoir as the mass of water still impounded behind the dam presses against the lightened mass of the embankment, made lighter by surface erosion. As

3015-417: The early 21st century. These techniques include concrete overtopping protection systems, timber cribs , sheet-piles , riprap and gabions , Reinforced Earth , minimum energy loss weirs , embankment overflow stepped spillways , and precast concrete block protection systems. All dams are prone to seepage underneath the dam, but embankment dams are prone to seepage through the dam as well; for example,

3082-488: The east by La Paz County , Arizona ; on the southeast by Imperial County ; on the southwest by San Diego County ; and on the west by Orange County . When Riverside County was formed in 1893, it was named for the city of Riverside, the county seat. That city, founded in 1870, was so named because of its location near the Santa Ana River . The Indigenous peoples of the valleys, mountains and deserts of what

3149-420: The embankment, in which case it is referred to as a "core". In the instances where clay is used as the impervious material, the dam is referred to as a "composite" dam. To prevent internal erosion of clay into the rock fill due to seepage forces, the core is separated using a filter. Filters are specifically graded soil designed to prevent the migration of fine grain soil particles. When suitable building material

3216-527: The farm labor union struggle. Riverside county has also 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 Indians and the Cabazon Band of Mission Indians . The tribes joined forces and fought the county all the way to the U.S. Supreme Court, which ruled in

3283-485: The flow of the water and continue to fracture into smaller and smaller sections of earth or rock until they disintegrate into a thick suspension of earth, rocks and water. Therefore, safety requirements for the spillway are high, and require it to be capable of containing a maximum flood stage. It is common for its specifications to be written such that it can contain at least a one-hundred-year flood. A number of embankment dam overtopping protection systems were developed in

3350-487: The lake for limited recreation similar to that available at other MWD reservoirs or, at the very least, have allowed for low-impact hiking in the Ecological Reserve. However, Jeffries withdrew the bill on March 20, 2012 after research determined that "virtually bulletproof" agreements prohibiting public access exist between the MWD and other entities interested in maintaining the status quo, and going forward with

3417-448: The largest earth-filled dam in the world. The principal element of the project is an embankment 9,000 feet (2,700 m) long with a maximum height of 465 feet (142 m). The dam used approximately 200 million cubic yards (152.8 million cu. meters) of fill, which makes it one of the largest man-made structures in the world. Because earthen dams can be constructed from local materials, they can be cost-effective in regions where

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3484-423: The mass of the dam erodes, the force exerted by the reservoir begins to move the entire structure. The embankment, having almost no elastic strength, would begin to break into separate pieces, allowing the impounded reservoir water to flow between them, eroding and removing even more material as it passes through. In the final stages of failure, the remaining pieces of the embankment would offer almost no resistance to

3551-436: The removal of non-native arundo grass ( Arundo donax ) from the Santa Ana River course. Since its dedication in 1940, the reservoir has been fenced off and closed to public access, supposedly to preserve water quality. The MWD has always been concerned about water quality and prohibits body contact sports like swimming in its other nearby reservoirs that are open for recreation, Lake Skinner and Diamond Valley Lake . Mathews

3618-459: The reservoir began in 1933, while the aqueduct was being built across the desert. The reservoir site had previously been occupied chiefly by carob orchards and tin mines. Lawrence Holmes, Sr., who owned 1,100 acres in the future reservoir basin, lost his property to eminent domain in a lengthy court battle. The dam across Cajalco Canyon and its intake structure were completed in 1939 (85 years ago)  ( 1939 ) . The first water arrived from

3685-476: The rock pieces may need to be crushed into smaller grades to get the right range of size for use in an embankment dam. Earth-fill dams, also called earthen dams, rolled-earth dams or earth dams, are constructed as a simple embankment of well-compacted earth. A homogeneous rolled-earth dam is entirely constructed of one type of material but may contain a drain layer to collect seep water. A zoned-earth dam has distinct parts or zones of dissimilar material, typically

3752-611: The signing of the Treaty of Cordoba in 1821, Mexico gained its independence from Spain, but the San Gabriel Mission near what is now Los Angeles, California , continued to expand, and established Rancho San Gorgonio in 1824. The ranch was to be one of the Mission's principal rancherias , and the most distant, and it occupied most of today's San Gorgonio Pass area. Following the Mexican secularization act of 1833 by

3819-663: The size of the State of New Jersey in total area. County government documents frequently cite the Colorado River town of Blythe as being a "three-hour drive" from the county seat, Riverside . Some view the areas west of San Gorgonio Pass as the Inland Empire portion of the county and the eastern part as either the Mojave Desert or Colorado Desert portion. There are probably at least three geomorphic provinces:

3886-401: The tower's massive valves unusable. To allow for construction without impacting the water supply, a cofferdam was constructed. Massive concrete tunnels were built to connect the new tower to the existing waterworks. Lake Mathews is surrounded by approximately 4,000 acres of protected land. In 1982, this land was declared a state ecological reserve. In the early 1990s, an additional 9,000 acres

3953-636: 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

4020-628: The tribes' favor on February 25, 1987. In turn, Congress enacted the Indian Gaming Regulatory Act in 1988 to establish a legal framework for the relationship between Indian gaming and state governments. Naturally, both tribes now operate large casinos in the county: the Morongo Casino, Resort & Spa and the Fantasy Springs Resort Casino adjacent to Spotlight 29 Casino . According to

4087-597: The winter. Lake Mathews was constructed in a basin formerly traversed by Cajalco Creek ; thus, any water flowing down the creek enters the reservoir. Cajalco Creek is a tributary of the Santa Ana River via Cajalco Canyon Creek into Temescal Creek . The original course of the creek, before 1933, can be seen on the US Dept. of the Interior's 1898 topographic map of the Elsinore Quadrangle . In 2003,

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4154-504: The world is the 233 m-tall (764 ft) Shuibuya Dam in China , completed in 2008. The building of a dam and the filling of the reservoir behind it places a new weight on the floor and sides of a valley. The stress of the water increases linearly with its depth. Water also pushes against the upstream face of the dam, a nonrigid structure that under stress behaves semiplastically, and causes greater need for adjustment (flexibility) near

4221-673: Was added to the reserve after the discovery of the endangered Stephens's kangaroo rat ( Dipodomys stephensi ) in the area. The area is now called the Lake Mathews Estelle Mountain Reserve. The Lake Mathews area is an important bird resting and feeding site, particularly in the winter months. In addition to a variety of ducks, double-crested cormorants ( Phalacrocorax auritus ), western grebe ( Aechmophorus occidentalis ), eared grebe ( Podiceps caspicus ), golden eagles ( Aquila chrysaetos ), and bald eagles ( Haliaeatus leucocephalus ), are present during

4288-487: Was historically a Republican stronghold in presidential and congressional elections. Between its creation in 1893 and 2004 , it voted for the Democratic presidential nominee only three times: Franklin D. Roosevelt in 1936 (by a margin of 337 votes, or 0.99%), Lyndon B. Johnson in 1964 (by a margin of 19,363 votes, or 13.65%), and Bill Clinton in 1992 (by a margin of 6,784 votes, or 1.58%). In 1932 , it

4355-417: Was of Mexican origin, 0.8% Salvadoran, 0.7% Honduran, 0.6% Puerto Rican, 0.3% Cuban, and 0.2% Nicaraguan descent. As of the census of 2000, there were 1,545,387 people, 506,218 households, and 372,576 families residing in the county. The population density was 214 inhabitants per square mile (83/km ). There were 584,674 housing units at an average density of 81 per square mile (31/km ). The racial makeup of

4422-465: Was one of only two counties in the entire West Coast to vote for Republican president Herbert Hoover over Roosevelt during the latter's landslide victory. In 2024, it was one of eight counties that flipped for Donald Trump after voting for Biden in 2020 , and was one of five counties that voted for the Republican presidential candidate for the first time since George W. Bush in 2004 In

4489-475: Was reopened and rededicated in September 1998. Riverside County hands down 1 in 6 death sentences in the US, in spite of it having less than 1% of the population. The Riverside County Sheriff provides court protection, jail administration, and coroner services for all of Riverside County. It provides patrol, detective, and other police services for the unincorporated areas of the county plus by contract to

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