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<br />, <br /> <br />Cherry Creek Dam. The 8UJft of the cost of constructing the enlarged <br />Cherry Creek spillway and the separable cost of the reregulating <br />storage in Toll Gate Creek reservoir is estimated at about $33 <br />million. All benefits to be achieved by such an investment are <br />essentially of an intangible nature due to the remote probability <br />assigned to the occurrence of the Cherry Creek spillway design <br />1'lood . <br /> <br />(f) Intrabe.sin stor"",e. Four general concepts <br />utilizing storage within the Cherry Creek basin were developed <br />and analyzed as potential solutions to the problems created by the <br />deficiencies in the Cherry Creek project. The basic features of <br />these concepts, or plans, are raising Cherry Creek Dam in conjunc- <br />tion with acquiring flood-threatened areas, mOdifying the location <br />and size of the Cherry Creek spillway, raising Cherry Creek Dam <br />and spillway crests, and providing remote supplementary storage. <br />These potential solutions are described in the following para- <br />graphs and discussed in more detail in appendix V. <br /> <br />(g) Plan 1. This plan would consist of raising <br />the Cherry Creek Dam to prevent overtopping, acquiring additional <br />lands in the Cherry Creek Reservoir, and acquiring flood prone <br />lands along Toll Gate and Sand Creeks. A 5-foot concrete parapet <br />would be constructed along the crest of the dam, and all reser- <br />voir lands and improvements below the maximum pool elevation, 5645 <br />feet, would be acquired. The lands and improvements along Toll <br />Gate and Sand CreekS which are subject to flooding from Cherry <br />Creek Reservoir spillway releases would also be acquired. The <br />total cost of this plan is estimated at $103 million. In addi- <br />tion to the high costs, this plan has obvious social and political <br />drawbacks associated with the real estate acquisition aspects. <br /> <br />(h) Plan 2. The essential feature of this plan <br />is an enlarged Cherry Creek Reservoir emergency spillway relocated <br />to discharge into Cherry Creek instead of Toll Gate Creek. The <br />concrete-lined spillway:would be designed to discharge the <br />prObable maximum flood Ond would be located in the right abutment <br />of the dam. The spillw~ would consist of an ogee-crested weir, <br />a 260-foot w1.de chute, and a stilling basin. Two multiple-lane <br />bridges would be required to carry the future interstate highway <br />225 over the spillway channel. Operation of the spillway would <br />limit the maximum pool level in Cherry Creek Reservoir to eleva- <br />tion 5630 feet and all reservoir lands below this elevation would <br />be acquired to prevent potential property damage within the <br />reservoir area. This plan to reroute the Cherry Creek project <br />spillway is estimated to cost about $16 million and may be an <br /> <br />26 <br /> <br />:{l)~~ <br />