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45-692: It is found within Alameda County and Contra Costa County . The Orinda Formation is a coarse alluvial conglomerates sedimentary formation. It underlies the volcanic Moraga Formation . It preserves fossils dating back to the Miocene epoch of the Neogene period . The Orinda Formation is prone to landsliding due to intrinsic properties such as its weak cohesive strength and low friction angle. Landslides less than or equal to 10 acres in size occur as slides, slumps, and earthflows on dip or parallel to dip slopes. In

90-527: A loop at a future time. Three ferry slips were operating by the 1920s. The Oakland, Antioch & Eastern Railway began running interurban cars from Sacramento to the mole starting in September 1913. This railway would go on to be consolidated into the Sacramento Northern Railway , offering services as far north as Chico and Oroville . On December 4, 1924, one train collided with

135-670: A bridge between Oakland and San Francisco included a design to extend the Key System Mole to San Francisco. Final plans for the San Francisco–Oakland Bay Bridge included building the Oakland approach adjacent to the mole. After the fire, the California Toll Bridge Authority filed to condemn and acquire part of the causeway as well as the property of the former terminal. Transbay service was transferred to

180-440: A mystery. The Key System received a $ 1.1-million insurance settlement for the disaster ($ 25.9 million in 2023 adjusted for inflation). With bridge construction looming, the pier and station were rebuilt as cheaply as possible to maintain service. A temporary steel structure served as the new station building. The line and station were rebuilt slightly to the south to accommodate bridge construction. Initial concepts to build

225-467: A stationary train at 40 miles per hour (64 km/h), killing six people and injuring 45 more. The Key System expanded their maintenance facility along the causeway in 1930 with the construction of the Bridge Yard building. In May 1933, an explosion and the ensuing fire destroyed the station building , 500 yards (460 m) of pier, the ferry Peralta , and 14 cars. The cause of the fire remains

270-543: Is a county located in the U.S. state of California . As of the 2020 census , the population was 1,682,353, making it the 7th-most populous county in the state and 21st most populous nationally. The county seat is Oakland . Alameda County is in the San Francisco Bay Area , occupying much of the East Bay region. The Spanish word alameda means either "a grove of poplars...or a tree lined street". The name

315-519: Is a special district within Alameda County created to distribute water, but it is not operated by Alameda County administrators. It is operated by an elected board of directors. Alameda County Superior Court operates in twelve separate locations throughout the county, with its central René C. Davidson Courthouse located in Oakland near Lake Merritt . Most major criminal trials and complex civil cases are heard at this location or in courtrooms within

360-536: Is absent for a meeting, the vice president shall be responsible. A Board election occurs every two years for these positions. Supervisor Carson is serving currently as president; Supervisor Miley is vice president. The county's law enforcement is overseen by an elected Sheriff/Coroner and an elected District Attorney. The Sheriff supervises the deputies of the Alameda County Sheriff's Office , whose primary responsibilities include policing unincorporated areas of

405-627: Is below the national average of 12.8% (including Black Hispanics). The Black population peaked in the 1980 Census at 18.4%. Alameda county has the 2nd highest percentage of Black residents in California after Solano County at 13.4%. If Hispanics are treated as a separate category from race, Alameda County's population was 30.4% White , 30.9% Asian , 22.3% Hispanic-Latino , 10.3% Black or African American , 0.5% Some Other Race, 0.3% Native American and Alaskan Native , 0.8% Pacific Islander and 4.4% from two or more races . Asian Americans are now

450-607: Is the local government for all unincorporated areas, and provides services such as law enforcement to some incorporated cities under a contract arrangement. It is composed of the elected five-member Alameda County Board of Supervisors (BOS) as the county legislature, several other elected offices and officers including the Sheriff , the District Attorney , Assessor , Auditor-Controller/County Clerk/Recorder , Treasurer/Tax Collector , and numerous county departments and entities under

495-653: The Diablo Range , containing the county's highest peaks, cover the very sparsely populated southeast portion of the county. The Hayward Fault , a major branch of the San Andreas Fault to the west, runs through the most populated parts of Alameda County, while the Calaveras Fault runs through the southeastern part of the county. The areas near the Bay itself have a maritime warm-summer Mediterranean climate , whereas behind

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540-550: The Hayward Fault . The county seat was then re-established in the town of Brooklyn from 1872 to 1875. Brooklyn is now part of Oakland , which has been the county seat since 1873. Much of what is now an intensively urban region was initially developed as a trolley car suburb of San Francisco in the late 19th and early 20th centuries. The Key System moved commuters to and from the Key System Mole , where ferries bridged

585-468: The San Francisco–Oakland Bay Bridge . The troubled California & Nevada Railroad had begun construction of a ferry pier in Oakland, but its plans were never realized. Francis Marion "Borax" Smith purchased the railroad in order to gain access to its right of way and waterfront operations, as well as use the abandoned pier as a starting point for his own passenger mole . Transbay service began on October 26, 1903. The original station building

630-499: The San Jose–San Francisco–Oakland, CA Combined Statistical Area . The county was formed on March 25, 1853, from a large portion of Contra Costa County and a smaller portion of Santa Clara County . The county seat at the time of the county's formation was located at Alvarado , now part of Union City . In 1856, it was moved to San Leandro , where the county courthouse was destroyed by the devastating 1868 quake on

675-417: The census of 2000, there were 1,443,741 people, 523,366 households, out of which 32.6% had children under the age of 18 living within them, 47.0% married couples living together, 13.0% had a female householder with no husband present, and 35.2% were non-families. 26.0% of all households were made up of individuals, and 7.3% had someone living alone who was 65 years of age or older. The average household size

720-598: The ACFD over the years. 1993 brought in the Castro Valley and Eden Consolidated FD, and the County Fire Patrol. San Leandro joined in 1995, Dublin in 1997, Lawrence Berkeley National Laboratory in 2002, Lawrence Livermore National Laboratory in 2007, The Alameda County Regional Emergency Communications Center in 2008, and Newark and Union City in 2010. Emeryville joined the ACFD in 2012. The Alameda County Water District

765-506: The Bay Bridge. The original wooden trestle extended 17,000 feet (5,200 m) into the Bay. After being rebuilt between 1906 and 1916, the trestle segment had been shortened to 3,800 feet (1,200 m), the rest being built up with landfill to become a causeway. The Mole's precarious length and ferry slips were the inspiration for the "Key System" moniker; W. F. Kelly, the railroad's first manager, believed their depiction on maps resembled

810-754: The Charter of the County of Alameda. Much of the Government of California is in practice the responsibility of county governments such as the Government of Alameda County, while municipalities such as the City of Oakland and the City of Berkeley provide additional, often non-essential services. The County government provides countywide services such as elections and voter registration, law enforcement, jails, vital records, property records, tax collection, and public health. In addition it

855-747: The County Administration Building across the street. In the California State Assembly , Alameda County is split between five districts: In the California State Senate , the county is split between three districts: In the United States House of Representatives , the county is split between four districts: Since 1932, Alameda County has been a stronghold of the Democratic Party, with Dwight Eisenhower being

900-554: The bridge on January 15, 1939, though Key System cars and ferries continued to run to serve the Golden Gate International Exposition until the season's closing on October 29. (Ferry service from the East Bay was not resumed the following year, and was replaced with buses.) The Mole was almost entirely dismantled over the following decades. The steel structure which served as the station building after 1933

945-459: The county and cities within the county which contract with the Sheriff's Office for police services; providing security and law enforcement for county buildings including courthouses, the county jail and other county properties; providing support resources, such as a forensics laboratory and search and rescue capabilities, to other law enforcement agencies throughout the county; and serving the process of

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990-622: The county on the north. Stanislaus County borders the county on the easternmost end of its southern boundary for 250 feet (76 m). A 2014 analysis by The Atlantic found Alameda County to be the fourth most racially diverse county in the United States, in terms of closest to equal representation of each racial and ethnic group,—behind Aleutians West Census Area and Aleutians East Borough in Alaska, and Queens County in New York—as well as

1035-438: The county was $ 55,946, and the median income for a family was $ 65,857 (these figures had risen to $ 66,430 and $ 81,341 respectively as of a 2007 estimate ). Males had a median income of $ 47,425 versus $ 36,921 for females. The per capita income for the county was $ 26,680. About 7.7% of families and 11.0% of the population were below the poverty line , including 13.5% of those under age 18 and 8.1% of those age 65 or over. In 2000,

1080-663: The county's Superior Court system. The District Attorney's office is responsible for prosecuting all criminal violations of the laws of the state of California, the county, or its constituent municipalities, in the Alameda County Superior Court. The current Sheriff is Yesenia Sanchez , who was elected in 2022, succeeding Greg Ahern , who had served in the post for 16 years. The Sheriff's Office operates two jails: Santa Rita Jail in Dublin , and Glenn E. Dyer Detention Facility in downtown Oakland . In 2009, Nancy E. O'Malley

1125-516: The formation, landslides greater than or equal to 10 acres in size are common to very common and occur as slumps and slides on anti-dip slopes. This article about a specific stratigraphic formation in California is a stub . You can help Misplaced Pages by expanding it . This article related to the Neogene period is a stub . You can help Misplaced Pages by expanding it . Alameda County, California Alameda County ( / ˌ æ l ə ˈ m iː d ə / AL -ə- MEE -də )

1170-474: The gap across San Francisco Bay . The historical progression from Native American tribal lands to Spanish then Mexican ranches, then to farms, ranches, and orchards, then to multiple city centers and suburbs, is shared with the adjacent and closely associated Contra Costa County . The Government of Alameda County is defined and authorized under the California Constitution , California law , and

1215-588: The largest denominational group was the Catholics (with 306,437 adherents). The largest religious bodies were the Catholic Church (with 306,437 members) and Judaism (with 32,500 members). Racial Makeup of Alameda County (2019) Racial Makeup of Alameda County excluding Hispanics from racial categories (2019) NH=Non-Hispanic Racial Makeup of Hispanics in Alameda County (2019) According to 2019 US Census Bureau estimates, Alameda County's population

1260-866: The largest racial/ethnic group at 30.9% (excluding Asian Hispanics). White Non-Hispanic Americans are the largest minority group at 30.4% of the population. By ethnicity, 22.3% of the total population is Hispanic-Latino (of any race) and 77.7% is Non-Hispanic (of any race). If treated as a category separate from race, Hispanics are the third largest minority group in Alameda County. The largest ancestry group of Hispanics in Alameda County (2018) are of Mexican descent (72.9% of Hispanics) followed by Salvadoran descent (5.5% of Hispanics), Guatemalan descent (3.9%), Puerto Rican descent (3.4%), Spaniard descent (2.0%), Nicaraguan descent (1.7%), Peruvian descent (1.4%), Cuban descent (1.2%), Colombian descent (1.1%), and those of other Hispanic ethnicity or of mixed Hispanic ethnicity (6.9%). The following table includes

1305-430: The most diverse county in California. The 2020 census shows Alameda as having one of the highest Asian percentages and being the only county in the continental US, along with neighboring Santa Clara County, California , to have an Asian plurality - consisting largely of Chinese, Indian and Filipino ancestry. The 2010 United States Census reported that Alameda County had a population of 1,510,271. The population density

1350-433: The mountains, summers are significantly warmer. The climate charts below are for Oakland and inland Livermore . The City and County of San Francisco, California , borders the county on the west, and has a small land border with the city of Alameda, California due to land filling. Santa Clara County borders the county on the south. San Joaquin County borders the county on the east. Contra Costa County borders

1395-453: The number of incidents reported and the rate per 1,000 persons for each type of offense. The Alameda County Office of Education oversees seventeen K–12 school districts and one K–8 district in Alameda County. In all, there are approximately 10,000 teachers serving 225,000 students. The ACOE also services three community college districts with a total enrollment of approximately 55,000 students. Key System Mole The Key System Mole

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1440-485: The only Republican presidential nominee to have carried the county since. Prior to 1932, the county had been a Republican stronghold. Piedmont resident William F. Knowland was the Republican U.S. Senate Leader from 1953 to 1959. Even when Ronald Reagan won the national popular vote by an 18.3% margin in 1984 , Walter Mondale won Alameda County by a larger margin. In 2004 it voted for John Kerry , who won over 75% of

1485-407: The sixth highest "no" vote, by percentage, of all California counties, and was the second largest county, by total voter turnout, to vote against it. According to the U.S. Census Bureau , the county has a total area of 821 square miles (2,130 km ), of which 739 square miles (1,910 km ) is land and 82 square miles (210 km ) (10%) is water. The San Francisco Bay borders the county on

1530-592: The supervision of the County Administrator. In addition, several entities of the government of California have jurisdiction conterminous with Alameda County, such as the Alameda County Superior Court . The current supervisors are: The Board elects a president who presides at all meetings of the Board and appoints committees to handle work involving the major programs of the county. If the president

1575-408: The vote. Every city and town voted Democratic. George H.W. Bush in 1988 was the last Republican to break 30% of the county's vote and Ronald Reagan in 1984 was the last to break 40% of the vote (carrying 40.01%). On November 4, 2008, Alameda County voted 61.92% against Proposition 8 , which won statewide, and which amended the California Constitution to ban same-sex marriage . The county garnered

1620-516: The west. The crest of the Berkeley Hills forms part of the northeastern boundary and reaches into the center of the county. A coastal plain several miles wide lines the bay; and is Oakland's most populous region. Livermore Valley lies in the eastern part of the county. Amador Valley abuts the western edge of Livermore Valley and continues west to the Pleasanton Ridge. The ridges and valleys of

1665-570: Was 2,047.6 inhabitants per square mile (790.6/km ). The racial makeup of Alameda County was 649,122 (43.0%) White , 190,451 (12.6%) African American , 9,799 (0.6%) Native American , 394,560 (26.1%) Asian (9.7% Chinese, 5.5% Filipino, 4.8% Indian, 2.0% Vietnamese, 1.2% Korean, 0.8% Japanese, 2.2% Other Asian), 12,802 (0.8%) Pacific Islander , 162,540 (10.8%) from other races , and 90,997 (6.0%) from two or more races. Hispanic or Latino of any race were 339,889 persons (22.5%): 16.4% Mexican, 0.8% Puerto Rican, 0.2% Cuban, 5.1% Other Hispanic. As of

1710-410: Was 2.71 and the average family size was 3.31. In the county, the population was spread out, with 24.6% under the age of 18, 9.6% from 18 to 24, 33.9% from 25 to 44, 21.7% from 45 to 64, and 10.2% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 96.60 males. For every 100 females age 18 and over, there were 94.00 males. The median income for a household in

1755-689: Was 38.8% White (30.4% Non-Hispanic White and 8.4% Hispanic White ), 10.7% Black or African American , 31.1% Asian , 11.5% Some Other Race, 0.8% Native American and Alaskan Native , 0.8% Pacific Islander and 6.4% from two or more races . The White population continues to remain the largest racial category in Alameda County and includes the 37.7% of Hispanics who self-identify as White. The remainder of Hispanics self-identify as Other Race (49.2%), Multiracial (8.7%), American Indian and Alaskan Native (1.9%), Black (1.5%), Asian (0.9%), and Hawaiian and Pacific Islander (0.2%). The Black population continues to decline and at 10.7% (including Black Hispanics )

1800-478: Was an interurban train and ferry pier on the San Francisco Bay . It served as an interchange point in the East Bay for Key System passengers traveling to and from San Francisco . It opened to passenger service in 1903 and was upgraded several times until 1933 when it was partially destroyed by a fire. Passenger service ended in 1939, and segments of the structure were partially reused in construction of

1845-416: Was appointed Alameda County district attorney after Tom Orloff retired. She served two terms and did not run for reelection in 2022. Pamela Price was elected as district attorney in 2022. The Alameda County Fire Department (ACFD) was formed on July 1, 1993, as a dependent district, with the Board of Supervisors as its governing body. Municipal and specialized fire departments have been consolidated into

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1890-403: Was built with supports very far apart and potentially reused part of the original California & Nevada Railroad structure; this was replaced with landfill in 1908. By 1916, most of the trestle bridge had been replaced with causeway , except a 3,800-foot (1,200 m) section connecting to the ferry terminal. The rebuilt approach to the ferry terminal was designed to allow for construction of

1935-523: Was designed by Walter J. Mathews and featured three tracks with one ferry slip. Switches were initially operated track-side until February 20, 1905 when a tower was installed. As demand for the service greatly exceeded expectations, the terminal was enlarged several times beginning very shortly after opening. Six tracks were in use by July 1907 with two more being constructed. The hasty building methods employed during construction were also becoming apparent at this time. The original approach trestle

1980-580: Was originally used to describe the Arroyo de la Alameda; the willow and sycamore trees along the banks of the river reminded the early Spanish explorers of a road lined with trees. Although a strict translation to English might be "Poplar Grove Creek", the name of the principal stream that flows through the county is now simply " Alameda Creek ". Alameda County is part of the San Francisco–Oakland–Berkeley, CA Metropolitan Statistical Area , and

2025-535: Was sold and moved to Oakland, where it served as part of a steel company's processing plant into the 1980s. 600,000 board feet of timber was salvaged from the pier for reuse in construction of the Shipyard Railway . The Bridge Yard building was restored by the California Department of Transportation in the late 2010s and serves as an events space. Portions of the causeway exist as landfill approaching

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