C150295 Feasibility Study - Laserfiche WebLink

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Outlet to Dillon Reservoir The oudet from ODR to the Town of Dillon (now undex Dillon Reservoir) has not been operarional since the Town of Dillon was relocated to the east shoreline of Dillon Reservoir, in the early 1960s. 2.1.3 Previous Studies P~liminary Scoping Document Old Dillon Ke.rerUOir E.~an.rion The xecommendations of the "Prelinvnary Scoping Document Old Dillon Reservoir Expansion" completed by SAIC and TZA in November 1995 were based on examination of existing information and consultation with appYOpriate resource and xegulatory agencies. The study recommends the items listed below (see Preliminary Scoping Document, Exhibit I). 4.1 WateY ResouYCes • Certain of the exchange opexarions which may be associated with use of an expanded Old Dillon Reservoir, as descxibed in Section 3.1.1, add some complexity to the water resources issues associated with this pxoject. Although the volumettic unpacts of the project are relatively small, they may occur throughout a large number of stream segments. Because the County's watex rights may be applied to vaYious alternative uses, it is difficult at this time to pxedict the timing and specific locations of potential streamflow impacts. The Counry should consider whether it is desirable, eithex as part of further envitonmental analyses of the project oY as a separate study, to pexfoxm additional water supply planning and Yeservoir operation studies in order to moYe cleaYly define how the expanded reservoi~ might be used. 4.2 Aquatic Biology/Threatened and Endangered Species • In the development of the operational chaYacterisitics for the pxoposed expansion altexnatives, consideY using some of the watex for release into the Blue River to help maintain minimum flow requirements. By including this purpose in the project operation, an important beneficial impact to trout populations would result from the project. - • When selecting the altexnatives foY the pxoposed Old Dillon Reservoir Expansion Project, select water souxces that would result in the smallest depletion in the Blue and Coloxado Rivexs. This approach would xepxesent the lowest level of impacts to important fish species in both xivers and T&E species in the Colorado River. 4.3 CuJtuxal Resoutces • A foYmal recoxds search with the Colorado Historical Society, noting the pYesence of National RegisteY listed oY eligible sites in the vicinity should be conducted. • An archaeological survey of the APE (aYea of potential effect), recording of archaeological Yesources and structures associated with the Old Dillon Reservoir, and an assessment of the potential significance of the resource should be conducted. • Contact with Native Amexican gxoups to detexmine the presence oY potential fox traditional cultuYal pxopeYties in the APE (aYea of potential effect) should be conducted." ~ 4