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<br />CH.-\PTER 2
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<br />MAIN AQUEDUCT
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<br />The Colorado River aqueduct project consists of two parts, the
<br />main aqueduct crossing the desert and piercing the mountain bar-
<br />riers to enter the coastal basin of Southern California, and the
<br />distribution system to deliver both natural and softened water in
<br />the coastal basin.
<br />The main aqueduct extends from the Intake pumping plant
<br />located on Lake Havasu, formed by Parker Dam on the Colorado
<br />River, to Lake Mathews, a large storage reservoir in the Cajalco
<br />basin south of the City of Riverside. The principal features of the
<br />main aqueduct comprise paved roads, graded patrol roads, tunnels,
<br />canals, cut-and-cover conduits, inverted siphons, Gene and Copper
<br />Basin dams and reservoirs, five pumping plants, a 230-kv trans-
<br />misssion line to deliver Boulder energy to the pumping plants and
<br />camps, and a telephone system covering the entire project.
<br />
<br />Construction
<br />The construction of all main aqueduct features was completed
<br />prior to July 1, 1941 as detailed in previous reports. The follow-
<br />ing tables 6 to 10 are repeated from the second annual report
<br />with the construction costs revised to June 30, 1942 to give effect
<br />to deferred credits or charges and provide data on the final costs
<br />of tunnels, canals, cut-and-cover conduits, and siphons.
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<br />H'l'ORAULlC PROPERTIES
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