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<br />" <br /> <br /> <br />(.0 <br />fl,. <br />c <br />r,: <br /> <br />"ICEw1D <br /> <br />PLAN 6 UPDATE MAC' ) , <br />REGULATORY STORAGE DIVISION, CENTRAL ARIZ~m: 'plW~T <br />MARCH 1989 OOlOlUwVWATEA <br />CONSERVATION <br />BOARD <br /> <br /> <br />( <br /> <br />CENTRAL ARIZONA PROJECT <br /> <br />The Central Arizona Project (CAP) was <br />authorized on September 3D, 1968. Its <br />main purpose is to furnish wa ter for <br />irrigation, municipal, and industrial <br />uses in central Arizona and western New <br />Mexico through the importation of water <br />from the Colorado River. <br /> <br />The CAP will bring an average of 1.2 <br />million acre-feet of the State's 2.8 <br />million acre-foot entitlement into <br />Maricopa, Pinal, and Pima Counties each <br />year. Of the annual average, 640,000 <br />acre-feet has been allocated to 71 cities <br />and towns and 14 industries; 309,828 <br />acre-feet has been allocated to Indian <br />communities; the remaining amount has <br />been allocated to 23 non-Indian <br />agricultural entities on a percentage of <br />the available supply basis. <br /> <br />REGULATORY STORAGE DIVISION <br /> <br />The Regulatory Storage Division of the <br />CAP has three principal purposes: <br />Increase the operating efficiency of the <br />CAP, provide facilities and means to meet <br />the flood control needs on the Salt and <br />Verde Rivers, and provide for the <br />structural safety of existing Bureau of <br />Reclamation dams on the Salt and Verde <br />Rivers. Orme Dam was included in the CAP <br />authorizing legislation as the feature <br />originally envisioned to provide these <br />project purposes. However, public <br />response to Orme indicated substantial <br />environmental, economic, and social <br />concerns which caused Reclamation to <br />reassess the facility and study <br />al ternatives to Orme. The Central <br />Arizona Yater Control Study (CAYCS) <br />examined alternatives to Orme which could <br />satisfy central Arizona's flood control <br />and water supply needs. Under the <br />authority of the 1978 Reclamation Safety <br /> <br />of Dams Act, the six Salt and Verde <br />River dams were being assessed. <br />Because the corrective measures <br />identified on these structures closely <br />interrelated with the flood control and <br />water storage objectives of the CAYCS, <br />dam safety was added as a study <br />obj ec t i ve. <br /> <br />Plan 6 <br /> <br />In April 1984, following one of the <br />most intensive studies ever performed <br />by Reclamation, the Secretary of the <br />In terior approved Plan 6 as the <br />alternative to Orme Dam to fulfill the <br />three principal project purposes. Plan <br />6 included construction of New Yaddell <br />Dam on the Agua Fria River to provide <br />regulatory storage for the CAP, flood <br />control, and recreation; construction <br />of Cliff Dam on the Verde River and <br />modifications to Roosevelt Dam on the <br />Salt River for flood control, water <br />conservation, recreation, and dam <br />safety; and dam safety modifications to <br />Stewart Mountain Dam, also on the Salt <br />River. <br /> <br />In April 1986, several Valley cities, <br />Salt River Project, and the Maricopa <br />County Flood Control District signed a <br />Plan 6 Funding Agreement for pre- <br />construction and construction work on <br />Cliff and Roosevelt Dams in expectation <br />of the new water storage, yield, dam <br />safety, and flood control benefits that <br />Plan 6 features would provide. <br /> <br />Modifications to Roosevelt and Stewart <br />Mountain Dam have begun. New Yaddell <br />damsite has been cleared and new access <br />roads to Lake Pleasant were built. <br />Construction of abutment foundations <br />for New Yaddell, the pump/generating <br />plant site, river outlet and diversion <br />works have also begun. <br />