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AdditLonal informatUm c"ncerning tnt's" maps and surv('ys, ohtained fr.)m the Lake County Land Use Administrllt,n C.)lorado \..'ater Conservllti.Jll Board. call r-e .Jr the II, A, STU~Y ARfA DESCRIPTION Drain8ge Basin Characteristics D, Related Flood Studies Arkans8s River Several existing studies were used in the preparati.)n vf this repvrt and the Hydrvlogy Report for Lake Connty. The Ce.)loglcal Survey '-'ater Supply Paper ;'0. l61l1 supplied streamgBge data [.)r the hydrological analysts (Reference 2). A Hydrologic Addendum fvr the Svuth Arkansas River and Poncha Creek (Reference 3), th... S<)11 C0nservation Service Flood Haz<lrd Analyses for Cottonwood Creek in the vicinity of BU<Jna Vist8 (Refet"ence 4), flnd f')r Chalk Creek in Ch8ffee County (Reference 5) were used for compadson purposes in the preparation of the Hydrology Report for the study area. A Pllrkville W8tershed AssessmOi'nt R<Jport was compl...ted in December, 1979 to assess the location of pt"opos...d nevelopment 0" Evans Gulch (Reference 6). The Ark.snsall River 0riginates in Lake taunty appr,)xi:nately 2 miles north""est of LC8dville, Colorado, at th<J conflu{>nce .)f Tennessee Creek and the East Fork Arkans8s River. PIe he8.dwater areas of the ArksnS8S River are located in the San Isabel N8tlonal For.,,,,t in northern l.ake County at elevatiDns in excess of 14,000 feet. The river flows southerly from ita origin through the study 8rea to Salid8, Col.)rado, and then easterly to the plains of eastern Color8do. Tributaries to the ArksnSR!; River in the study area Include Box Creek, Halfmoon Creek, Lake Fork Creek, and numerous small tributsries. Stream stati.)ning for the Arkansas River is b8sed in hundreds of feet 8bove the USGS/State of Color8do streamgage (07086000) on the Arkansus River at Granite, Colvra<Jo. The down8tre8m study limit of the Ark8nsas River is located llppr.)ximately 24,580 feet ahove streamg8ge (07086000). The ""atershed are8 draining to the downstream limit is approximately 327.0 square miles. /o:.)I"mal rainfall pt"ecipitation in the study ba.sins ranges frum apprOXill18tely 16.8 inches per ye8r (Le8dville) in the rn0untainQUS region~ tD" "pproxim8tely 11.4 ind'es per year (south .)f th.. study area 8t Salid8) in the 1.1wer ",levllti.)nS (Referenc.. 9). Maximu[!' and minimum tempenlturc extrcmus rangB In tho study basins from ahout 660 F in the lower elevations to approximately _300 F in the highlands. The upper Arkans8s River b8sin is Ivcated within th~ fryingpan-.!Irkansiis Pr.)jcct Are8. The Fryingpan-.!Irkansas Project 1" a Dlultipurpose tr8ns-m.)unt1l.in diversion development in southeastern Colorado. It will make possible an averllg... 8nnuBI diversion of 69,200 acre-feet of surplus water fro'n the Fryingpan River 8nd other tributaries of the Roaring Fork River on the western slope 0[ the fI.0Cky M0lHltalll8 t'J tllu Arkansa~ Riv"r on tllte eastern sI0pe (Reference 7). Two existing reservoirs that are part of the proj...ct within the vicinity of the study are8 are Turquoise Lake and Twin Lak"s Reservoir. Sugar Loaf !Jar:'! ann Turqu.,:,ise Lake are east of the Continental Divide on the Lake Fork vf the Arkans8s River in Lake C.)unty, I.Ipproxilnately 5 10il"s wec;t 0f Leadville. The reservoIr storage c8pacity is 1Z9,432 acre-feet. The capacity of th.. river outlet is 1,120 cubic fei't per sec0nd, Rnd the capacity of the outlet to the !'1t. Elhert Conduit is 370 cubic ket per seconn. (Refer..n,",' 7) The Bureau .,:,f Reclamation prep8red an intern81 document entitled Project De~cription; Fryingp8n - Arkansas Proj..ct (Reference 7) which was used [.)r information concerning the pllrts of the project within the study reaches. A final environmental "tate~ ment for the Fryingp8n-Arkansas Project (Reference S) was also prepared by the Bureal.l of Reclaro8ti.)n in April 1975, which was used for general information in this report. There fire no other current related flo.,:,d studies for areas in the vici nUy of t~e ~tudy are8. '3' -4-