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--I OOGl5S 47 the basis of available data concerning historical streamfiows, present hydrologic conditions, and operation of the Compact, a period of at least 35 years would be required; and continued annual deli\~ery of about 59,200 acre-feet of salvaged \vaters to the Rio Grande for Compact credit would be required to maintain Colorado in a debit- free condition. In such event, pumping of ground waters could be reduced to result in salvage of only the amount of waters required to maintain Colorado in a debit-free status or additional uses of Rio Grande flows in Colorado in the amounts surplus to Compact require- ments could be initiated to mitigate water shortages which currently are experienced in the San Luis VaIle:r or for potential new develop- ments. If such identifiable uses of salvaged waters in Colorado arc undertaken, arrangements should be made with the identifiable beneficiaries for payment of appropriate portions of the costs of the Closed Basin water salvage features. The plan provides that the water salvage features would be operated and main tamed by the Bureau of Reclamation as a unit of the San Luis Valley project. The ~lishak Lukes N utionul Wildlife Refuge would be operated and maintained at Federal expense under the provisions of the ~ligratory Bird Conser,ulion Act of Februury 18, 1929 (45 Stat. 1222), as amended. Operation IInd maintenance of the recreational facilities at San Luis Lake would be assumed by an nppropriate local or State entity at non-Federal expense. The Federnl construction cost, as estimated on the basis of Janu. ary 1963 prices, totals ubout $8,370,000, including $414,000 for the .\lishuk Lukes Nutional Wildlife Refuge and $180,000 for basic recre.- tionlll facilities. These costs do not include any allowance for rights- of-way for project purposes on lands owned by the State of Colorado which \\;ll be furnished bv Colorado as a contribution. The annual operation, ~ maintenance, and replacement costs of the water salvage features, includin? measures incorporuted for improve- ment of fish hubitat, ure estimuted on the basis of current pnces to average $186,000 annually. The annual economic costs are estimawd to average $448,300 for a 1 aD-year period of tlnulysis. The evaluated benefits are estimuted to total $2,452,800 annually. The ratio of evaluated totul annual benefits to estimated Federal costs is 5.47 to 1.0. Of the $8,370,000 construction cost, $6,906,800 is ullocnted to \vater sulvug'l>, $832,400 to fishery enhancement, $205,000 to recreation and $425,800 to area redevelopment. Construction of the proposed water sal\"age and related fucilities as a .F'edl'ral project. in accorduncc with the plan of development !)resented h('f(.in is de:-:irable to make Ilnlilabll' for beneficial use urgC'nt y needed udditional water supplips, to provide desifll.ble fishery, recrelltional, Ilnd firea redevelopment benefits. Recommendc.tio-ns I t is rccomm(luded tha t: (8.) This report be submitted to the Congress for its information and consideration. LEO" W. HILL, Regional Dirutor.