The Colorado River Aqueduct begins near Parker Dam on the Colorado River. There, the water is pumped up the Whipple Mountains where the water emerges and begins flowing through of siphons and open canals on the southern Mojave Desert. At Iron Mountain, the water is again lifted,. The aqueduct then turns southwest towards the Eagle Mountains. There the water is lifted two more times, first by to an elevation of more than, then by to an elevation of above sea level. The CRA then runs through the deserts of the Coachella Valley and through the San Gorgonio Pass. Near Cabazon, the aqueduct begins to run underground until it enters the San Jacinto Tunnel at the base of the San Jacinto Mountains. On the other side of the mountains the aqueduct continues to run underground until it reaches the terminus at Lake Mathews. From there, of distribution lines, along with eight more tunnels, delivers water to member cities. Some of the water is siphoned off in San Jacinto via the San Diego canal, part of the San Diego Aqueduct that delivers water to San Diego County.
Background and construction
As the Los Angeles metropolitan area grew in the early 1900s, Mulholland and others began looking for new sources of water. Eventually, Los Angeles laid claim to the waters of the Owens Valley, east of the Sierra Nevada, and in 1913 completed the Los Angeles Aqueduct to deliver its waters to the burgeoning city. By the early 1920s, Los Angeles had grown so rapidly that the Owens River watershed could no longer supply the city's needs for domestic and agricultural water. By 1923, Mulholland and his engineers were looking east to an even larger water supply, the Colorado River. The plan was to dam the Colorado River and carry its waters across hundreds of miles of mountains and deserts. In 1924, the first steps were taken to create a metropolitan water district, made up of various cities throughout southern California. The Metropolitan Water District was incorporated on December 6, 1928, and in 1929 took over where Los Angeles had left off, planning for a Colorado River aqueduct. The MWD considered eight routes for the aqueduct. In 1931, the MWD board of directors chose the Parker route which would require the building of the Parker Dam. The Parker route was chosen because it was seen as the safest and most economical. A $220 million bond was approved on September 29, 1931. Work began in January 1933 near Thousand Palms, and in 1934 the United States Bureau of Reclamation began work on the Parker Dam. Construction of the aqueduct was finished in 1935. Water first flowed in the aqueduct on January 7, 1939. The CRA contributed to urban growth in the south coast region. Although the CRA brought "too much, too expensive" water in its early years of operation, subsidies and expansion of MWD's service area brought reduced prices and expanded demand. On subsidies and sprawl, note that it was not until 1954 that Met's revenue from selling water exceed the cost of delivering it; it was not until 1973 that revenue from sales exceeded revenue from taxes. Since about 80 percent of Met's costs are fixed, revenue needs to cover far more than operating expenses in order to pay for all costs. In 1955, the aqueduct was recognized by the American Society of Civil Engineers as one of the "Seven Engineering Wonders of American Engineering".
