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Watel will now back up behind Soldier Creek Dam creating tile enlarged StI3W- berry Reservoir, the key storage facility at the Central Utah Project's Bonneville Unit. The name Soldier Creek Reservoir will be dropped. The new reservoir's capacity will be 1, t 06.500 acre-Ieet 01 water Water in the reservoir is expected 10 raise 45 more teet belore the lull capacI- ty of the dam is reaclled. Boaters should be able to travel any- where on the enlarged reservOIr In Ihe spring 01 1986. Placement 01 roller-compacted concrete (RCC) al Upper Stlllwaler Dam began in early September 1985, with a maximum placement 01 200 cubic yards per hour in the early stages. Tile RCC was placed on top at ordinary leveling concrele that had been previously piaced on the base 01 the structure. Tile contractQr, Tyger Con- struction. placed concrele In two shifts per day while weather perrTlllled. ~ .) ~. .""," \. . '" '.,'~ ,.r ' . ,- Jh . - "...--....- . ~ --~ ~.. ~..-... ;', ~ <w' .. . , .-- , Cleanup of S~lCaJ t.1f.'fol(~ plaClfllj concrete at Upper Stillwater 4 Upper Stillwater Dam IS the first roiier- compacted concrete dam to be con- structed by the Bureau 01 Reclamation. The RCC. at which most of the dam will be burlt, contains more pozzolan mater- Ials (in the form 01 fly ash) and less water, but maintains its structural strength It IS delivered by dump truck. placed between concrete curbing ele- ments and compacted by roller. Because IIle contraclor can use high-production equipmenl, he can complete the struclure laster than when burlding a regular con- crete dam. The dam site is 31 air miles northwest 01 Duchesne, and is the uppermost part 01 the Strawberry Aqueduct and Collection Syslem which will carry water from the Uinta Basin to the Bonneville Basin. The t88-loot high dam is scheduled to be compieted In 1987. The proposed plan lor Ihe Bonneville Unit's Diamond Fork Power System re- I> ..~ ~ -- malned the same Irom the time of publi- callon 01 the Definite Plan Report (DPR) in 1964 until publication 01 the Diamond Fork Power System Draft Environmental Statement In June 1983. Since that time, the plan has changed in response to changing needs and conditions. The 1964 DPR plan provided tor a 133.5 -mega waft Ilow-through system. The recommended plan presented in the 1983 Diamond Fork Power System Draft En, vJ(onmental Statement consisfed 01 an 1147 megawaft pumped-storage system, wllh turbines and generators to be located In a targe underground chamber beiow Filth Wafer Canyon, a tribufary of Diamond Fork. Because of lack of adequate non-Federal Ilnancial support and potenlial trensmls' sion problems for such a lalge system This altemafive was dropped as the recommended plan in the Diamond Fork Power System Final Environmental Impact Statement, published in October 1984. The recommended plan substituted in the final statement consisted 01 a 166-mega- waft system, to be linanced by non-Fed- eral entities, excepf for 32 megawafts re- quired for projecf pumping. However, again because of lack of in- terest In providing non,Federal tinancing, the power system plan has been revised to provide a system wifh less capacity, adequate for project purposes only. While fhe polential slill exists for non-Federal development 01 additional power, such development would be considered an ad- ditional leature, rather Ihan an essential part 01 the system. The downsized development still includes Syar Tunnel, Monks Hollow Dam, and the Diamond Fork Pipeline as major project facilities. These features were all included in the 166-megawaft system proposed in the linal environmental impact slatement. The new plan includes a Filth Waler Aqueduct and a Last Chance Powerplant, which were not included In any previous plan. The new plan eliminafes Syar Pow- erplant, Syar Dam, Corona Aqueduct, Sixth Wafer Powerplant. Sixth Wafer Dam, Dyne Aqueduct, and Dyne Powerplant. The downsized plan provides for 32 megawafts of installed generating capacity