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<br />The "Review Report for Metropolitan Denver and South Platte River and <br /> <br />Tributaries, Colorado, Wyoming, and Nebraska," published in September 1977, <br /> <br />formulated a nwnber of plans designed to insure the hydrologic adequacy of Cherry <br /> <br />Creek Lake. The report concluded that structural plans would be costly and <br /> <br /> <br />socially and environmentally objectionable, It: recommended that rel.eases of up <br /> <br />to 5tOOO c.f.s. be made from Cherry Creek LakE! regardless of downstrl:am channel <br /> <br />condi tions. This policy of prompt drawdown of 'the Cherry Creek Lake pool would <br /> <br />allow the asswnption of a half-full flood control pool /it the beginning of the <br /> <br />Probable Maximwn Flood (PMF). Using the PMF es'timated at that date, the Cherry <br /> <br />Creek Lake embankment would not be overtopped with that: assumption, In view of <br /> <br />the relatively high reservoir releases needed on ChHrry Creek, it was also <br /> <br />recommended that an emergency evacuation plan be developed. <br /> <br />In May 1983, the Omaha District submHted a Design Memorandum (DI1) entitled <br />"Rehabilitation of Spillway Channel, South Pla.tte River, Cberry Creek Lake, <br />Colorado." Tree removal from the spillway channel was recommended :en this DM, <br />This recommendation was approved and removal of the trees was accompli.shed in <br />1983, <br /> <br />In January 1985, the Omaha Disuict submit.ted DM CC-ll entitled "Spillway <br /> <br />Performance Review." Various options were considered to rehabilitate the <br /> <br /> <br />spillway channel for dam safety purposes. The recommended plan was to implement <br /> <br /> <br />a periodic maintenance plan to remove trees and other vegetation from the <br /> <br />spillway channel. <br /> <br />In May 1985, DM CC-IO "Sediment Removal" >las publish"d. This DM looked into <br /> <br /> <br />the problem of the emergency gates becoming sil ted in a1: the intake structure. <br /> <br />Several tlflushing" operations were conductE~d as a result of this Dt1 and a <br /> <br /> <br />recommended flushing schedule was approved in which accumu.lated deposits upstream <br /> <br /> <br />of the service gates would be periodically flushed through the outlet works to <br /> <br /> <br />prevent a severe buildup of sediment that would prevent the emergency gates from <br /> <br />being lowered, <br /> <br />5 <br />