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Colorado River Basin Salinity Conlrol Project, and Colorado River Water Quality Improvement Program (General Overview) Colorado River Basin States: Arizona, California, Colorado, Nevada, New Mexico, Utah, and Wyoming Upper and Lower Colorado Regions Bureau of Reclamation The Colorado Rh'er Basin Salinit}, Control Act, Publi(' Law 93-320. authorized the construction, operation, and maintenance of works in the Colorado Ri..'er Basin to control the salinity of water deli..'ered to Mexico. Title I of the 8Ct (programs downstream from Imperial Dam) authorized construdion of the Desalting C.omplex, Coachella Canal, and the Protecti..'e and Regulatory Pumping Units. These are primarily water recoH>ry units, and were either completed or under construction in 1983. Tille II of Ihc acl (programs upslream from Imperial Dam) authorized construetion of the Paradox Valley and Grand Valley Units in Colorado, the Crystal Ge}'ser Unit in Utah. and the Las Vegas Wash Unit in Ne\-'ada. Ad\'ance planning studies or construction ac- tivities were underway on lhrt~e of these four units in 1983. Also authorized under Title II was the authority to expedite completion on planning reports on 12 units described in the Se(:retary'8 report, "Colorado Rh'cr \Vater Quality Impro\'ement Program, February 1972." Public Law 96.375. daled October 3, 1980. authorized feasibility studies on 9 of these units, plus the Meeker Dome Unit. These investigations are classified in three categories: (1) irrigation source l'ontrol. (2) point source control, and (3) diffused source control. COLORADO RtVER BASIN SALlNtTY CONTROL - TITLE I Programs Downslrellm From Imperial Dam Title I of the ael permits implementation of the pro- visions of Minute No. 242. This minute. formaH)' ap- proved hy the United Statc8 and Mexico on Augu8t 30. 1973. is an agreement by the two governmenls which pro\-'ides that Ihe Uniled States shall adopt measures to ensure that 1.36 million acre-feet of water delh'ered annually to Mexico upslream of Morelos Dam shall ha\'e an average salinity of no more than 115 :t 30 parts per Region Rt'",i~ion l/8~ (F rom Projt'i:t Dala Book) million over Ihe annual a\'erage salinily of Colorado River water arri\-'ing al Imperial Dam. The agreement further provides for Ihe Uniled States 10 deli\'er to I\']exico, across the land boundary at San Luis, Ariz.., and in the Limitrophe Section of the Colorado Ri\'er down- stream from Morelos Dam. approximately 140,000 acre- feet of water annually. with salinity substantially the same as thai of waler customarily deli\'ered there. The minute also pro\'ided that the concrete-lined Main OUllet Drain Extension (MODE) be exlended from Morelos Dam to Ihe Santa Clara Slollgh in Mexico at United Slates expense. Included in Ihe Desahing Complex Unit are strudural measures consisling of: (1) a memhrane-process desahing plant. a pretrealmenl plant. and the necessary appurte- nant works to treat drainage Willer from the Welhon- Mohawk Division, Gila Project; (2) extension of the concrele-lined bypass drain from Morelos Dam to the Santa Clara Slough in Mexico; and (3) replacement of an existing metal flume in the MODE with a concrete siphon. Nonstructural measures consist of: (1) an irri- gation efficiency impro\-"cment program in the W"ellton. Mohawk Dh'ision: (2) an irrigable acreage reduclion program in the Welhon-Moha\\o'k Di\'ision; and (3) ac- quisition of land. if needed, in the Corps of Engineers' Painted Rock Resenoir. In connection with the desalting plant. but to be in- \'estigated independenlly, Section 101t' of the act aulh- orized the Reject Slream Replacement Study to iden- tif)" feasible measures which could adequately replace the water lost through reject from the Y lima Desah- ing Planl and all)" Wellton-Mohawk drainage water bypassed to Ihe Santa Clara Slough. The source of an)' E.uch replacement water was limited by the act to the States of Arizona, Colorado, California, New Mexico_ and those portions of Nevada. Utah, and "'loming which are within the natural drainage basin of the Colorado Rh'er. The act also specified a study completion date no laler than June 30, 1980.