page_title: Los Angeles Aqueduct
section_title: Construction
hierarchical_section_title: Los Angeles Aqueduct / Construction
caption_attribution_description: English: Typical construction view of lined canal and covered concrete conduit.
context_page_description: The Los Angeles Aqueduct system, comprising the Los Angeles Aqueduct and the Second Los Angeles Aqueduct, is a water conveyance system, built and operated by the Los Angeles Department of Water and Power. The Owens Valley aqueduct was designed and built by the city's water department, at the time named The Bureau of Los Angeles Aqueduct, under the supervision of the department's Chief Engineer William Mulholland. The system delivers water from the Owens River in the Eastern Sierra Nevada Mountains to Los Angeles, California.
  Known as the California water wars, its construction was controversial from the start, as water diversions to Los Angeles eliminated the Owens Valley as a viable farming community. The continued operation has led to public debate, legislation, and court battles over the environmental impacts of the aqueduct on Mono Lake and other ecosystems.
context_section_description: The aqueduct project began in 1905 when the voters of Los Angeles approved a US$1.5 million bond for the 'purchase of lands and water and the inauguration of work on the aqueduct'. On June 12, 1907 a second bond was passed with a budget of US$24.5 million to fund construction.
  Construction began in 1908 and was divided into eleven divisions and a cement plant. The number of men who were on the payroll the first year was 2,629 and this number peaked at 6,060 in May 1909. In 1910, employment dropped to 1,150 due to financial reasons but rebounded later in the year. Between 1911 and 1912 employment ranged from 2,800 to 3,800 workers. The number of laborers working on the aqueduct at its peak was 3,900. In 1913 the City of Los Angeles completed construction of the first Los Angeles Aqueduct.
  The aqueduct as originally constructed consisted of six storage reservoirs and 215 mi (346 km) of conduit. Beginning three and one half miles north of Black Rock Springs, the aqueduct diverts the Owens River into an unlined canal to begin its 233 mi (375 km) journey south to the Lower San Fernando Reservoir. This reservoir was later renamed the Lower Van Norman Reservoir.
  The original project consisted of 24 mi (39 km) of open unlined canal, 37 mi (60 km) of lined open canal, 97 mi (156 km) of covered concrete conduit, 43 mi (69 km) of concrete tunnels, 12.00 mi (19.31 km) steel siphons, 120 mi (190 km) of railroad track, two hydroelectric plants, three cement plants, 170 mi (270 km) of power lines, 240 mi (390 km) of telephone line, 500 mi (800 km) of roads and was later expanded with the construction of the Mono Extension and the Second Los Angeles Aqueduct.
  The aqueduct uses gravity alone to move the water and also uses the water to generate electricity, which makes it cost-efficient to operate. The aqueduct system has been operated safely throughout its history and is still in operation.
caption: Typical construction view of lined canal and covered concrete conduit.
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