The Los Angeles Aqueduct is a water supply system that transports water from the eastern Sierra Nevada mountains to the city of Los Angeles. Completed in 1913, it spans over 400 miles and was designed to provide a reliable water source for the growing population of the city. The aqueduct primarily channels water from the Owens River. Constructed under the direction of engineer William Mulholland, the aqueduct was a significant engineering achievement of its time. It consists of a series of pipelines, tunnels, and open channels, allowing water to flow by gravity. The aqueduct remains a crucial infrastructure for the region's water supply today.