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r 48 older structures. For this report, t.herelor~, future annual operation, maintenance, a.nd replacement. costs are estimated a.t $3 per irrigated acre. Part VI-COORDINATE PROJECT FUNCTIONS FLOOD CONTROL Tbe Corps of Engineers evaluations of average 1I00d damages and :Bood control benefits for the Narro\~.s unit were developed on the basis of existing conditions and 1965 price levels. These evaluations were made under tbe assumption that the upstream proposed Cbat- lIeld Dam, which is autborized for construction by the Corps of Engineers, would be in operation. As estimated by the corps, average annualllood control damages are $1,730,000 and flood control benefits from the Narrows Dam and Reservoir would be $961,000 without diversion of Bijou 1I0ws and $1,123,000 with diversion of Bijou 1I0ws, In order to obtain tbese flood control benefits, tbe peak down- stream flows must be limited to 10,000 cubic feet per second, This objective could be accomplisbed hy means of 550,000 acre-feet of fl!?od control space in the reservoir. This entire capacity, however, will be needed only during the most flood-prone se""on of tbe year, Therefore, at tbe discretion of tbe Bureau of Reclamation 75000 aere- feet of tbis 1I00d control space could be allocated to joint-us~ purpose (flood control and irrigation). Such an allocation would reqUlre that the joint-use srace be available lor flood cont.rol use through the main flood season 0 each year. Alter this season, it would be available (or conservation purposes. A letter from the Corps of Engineers showing the evaluation of the 1I00d control reqUITements for .he Narrows 'unit is appe,nded, FJ6H AND WILDL]l"E ;' The appended reports by the Bureau of Sport Fisberies and Wildlife Fish and Wildlife Service, Albuquerque, N. Mex., presents that age?cy's plan of development for the N arrows unit, Tbe analysis of project effects on ~sh and wildlife was predicated on projections made of fishing and huntmg and other relaterluses under conditions expected to prevail witho~t tbe project and witb the project in operation. Both sets of prOjections were made for a 100-year period, Tbe dif- fere~ces between such estimates, made on an annual basis, were then attrIbuted to tbe Narrows unit as a mellSure of its effects, Evaluation of the effects resulted in annual benefits of $198100 assignable to the basic Narrows unit. The service made four rec~m- meudatioDs which the Bureau of Reclamation has included in thE". pIau of development that would yield additional benefits of $94600 making total annual fisb and wildlife enhancement benefits of $292'700: Table 9 is a summariza.tion of the benefits by category. ' . The Fish und Wildlife Service estimated that the capitol cost o( Its proposed 15,765-11cre wildlife management area wOllld be $2,265,000, with annllal operntion, maintenance, and replacement expenses of $37,000, Tbe lnnd requirements would consist of 8,545 acre~ of normal reclam~tion fee title rights-of-way, 3,520 acres speCIfically for fish and wildlife to be acquired in fee tilJe, and 3,700 . ~ 49 acres normally reclamation 1I00d ellSement lands which will also be acquired in fee title. Existing Jackson Lake is to be acquired and operated to jointly serve tbe functions of fisb and wildlife and recreation, Tbe capi.B.l cost of $125,000 for rehabilit.ation and tbe annual O,M, & R. expense of $] 8,000 are to be sbared equally by the two functions, TABLE 9.-FlSlt AND WILDLIfE ENHANCEMENT Itlm proJlICt ."eels CluslfiClllioROf Recommendations Addlllonll benefits blnelitll Total thlion_l LDcaI Wlrmwallfti,hinll: NlrrOW'!lResllrvoir_____.. B,low NlrrO\lrSOam.__. ____$150,000 7,500 15,000 172,500 $150,000 7,500 15,000 17Z.~O ...___$150,000__..________ ______."________ 1.500 SOc.h.nowund $0,000 ___:: ICCISS. .lnMIr1tioninplln... 15,000. 21,000___ JecksonLlkI___.. Subtotal.. _.____ ..._________ 151,500 Hunltnl: WIllrlowL... _________ n.. 25,200 ManlllemllntulH___ Upllndllmll(-Z4,800rnln.dIYS)__.. _____._ MiIIS'led___....____ Othlr (-1,000 rnlll.dIYS)___.. ..____do..._ ________. ,H,OOJ. ______. 52,200 4,500___.._____ 4,100 52,200 ",SOD Trlpph~:~~\~\.oil~itSf: --- n__ --.. _~~~~~ .Mijiiiiid~:" :~::::::_ _. ~~:~_::: :::::::___~:~~~__ ___~~~~~ Waterfowl us,___. ______. ....______ 20,400 Mall'Jemant."a.__ 30,600 $51,000. 51,000 Wildlrle.orltnladrllcreation__.. ....___ I,OOO___.do.____.....___ II,~______.._ 12,500 12,500 Totllllnnu'lblnllfib._________ 198,100. 94,600 51,000 Z41,7OO Zi2,70Q Some of tbe fish and wildlife measures will jointly serve the pur- poses of mitigation and local and national enhancement. In accord- ance. with provisions of t.he Federal Water Project Recreation Act PublIc Law 89-72, the costs of fisb and wildlife mi.igation measure~ are treated as joint costs and Lhe capital costs of measures lea.ding to localllsh and wildlife benefits-excel" those related to waterfo wi use like nesting, resting, and win taring-are to be costrsbared equally by the ,Federal Govemm,en. an~ the non-Federal administering entity, In addItIOn to costs specifically mcurred for fisb and wildlife measures a share oC joint dam and reservoir capital and annual costs is allocated to the function. The allocations of capit,sl and annual costa a.re presented subse- quently in part X of this planning report, RECREATION Two reports by the National Park Service are appended to this planning report. Th~ first recr~ation report presented a plan of develop- ment to serve the Imtlal antIcIpated publIc use. The second recreation report projected the incre~sed visitor day. and, additional incremental costs and benefits that Inlght result when ultimate recreation use is reached at the Narrows Reservoir. The incremental development based upon projected population increases, consists of four ]O-yea~ stages oC development starting with year 11 of project operation. Total benefits for the 50th year of operation are pro/.ected as constant for the latter one-half of the 100-year period of ana ysis, Bec~use of the stage ?evelopme.nt, it is necessa.ry for benefit-cost analysIS and cost allocations to adjust coslB and benellt.. to take into