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<br />.. .... .~ - <br />i..i;; J ~-j <br /> <br />68 <br /> <br />~I E Tn 0 I' 0 LI TAN IV ATE H D 1ST Hie T <br /> <br /> <br />Dish.am/ion sY8tem hear/work ,,/ Lake Mathews <br /> <br />of the dike and around the head works, and trees supplied by the U. <br />S..and state forest services were set out. Drain manholes and berm <br />ditches on the dike were cleared of debris washed in by winter <br />rains, Additional roads were graded, Hazel road surfacing was <br />remixed. relaid, seal coated and brushed, and guard posts were put <br />in around curves. <br />The first Colorado River water flowed from Valverde tunnel into <br />the reservoir on November 2, 1939. The lh-st water discharge into <br />the upper feeder occurred in February 1940 when 104 acre feet <br />were released, part of which flowed through the pipe lines to the <br />Palos Verdes reservoir. <br />On Ma:, 17, 1940 the public relations committee of the board of <br />directors recommended that Cajalco reservoir and dam be desig- <br />nated Lake Mathews and Mathews dam in honor of the late W. B. <br />Mathews, first general counsel of the District. This recommenda- <br />tion was unanimously approved. <br /> <br />Headworks <br /> <br />The headworks structure between the Cajalco outlet tunnel and <br />the upper feeder is required to control the flow and pressure of <br />water released from Lake Mathews. A contract for its construction <br />was awarded to The Contracting Engineers Co., of Los Angeles, <br />on March 25, 1!l88. The principal features were a concrete strncture <br />containing a welded steel manifold connected to the steel lining <br />of the outlet tunnel, with regulating valves: a concrete-lined forebay <br />