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<br />t <br /> <br />. '~I(l~t Wl~~;t fill AVtJlllJC <br />[ll:IlVI!r CllhllilllpIlIJ;:'{M <br />Jll:l ~l/:l /tlll:) <br /> <br />Woodward.Clyde Consultants <br /> <br />~ <br /> <br />,"" G" <br />1.:0 -,1 <br /> <br />February 16, 1978 <br /> <br />I <br /> <br />Colorado Water Conservation Board <br />Centennial Building <br />1313 Sherman Street <br />Denver, Colorado 80202 <br /> <br /> <br />Attention: Mr. Felix Sparks, Directo;> <br /> <br />Re: Geotechnical Consultation, Na~ws Dam, <br />Morgan County, Colorado, St~ie;lof Colorado <br />Department of Natural Resources <br />Contract No. C153205 <br />Job No. 19140-7354 <br /> <br /> <br />Gentlemen: , <br /> <br />We have completed our inde~view~of the data and studies <br />developed by the u.S. Burea~ ~f Rec1amation for the feasibility <br />stage design of Narrows Dam.~oti~ cbncl~sions and recommendations <br />are summarized in the following pa~agraphs. <br /> <br />The Narrows dam~is lO~~d on the South Platte River <br />upstream appr6~~mat~ly 7 mil~t from the city of Ft. Morgan. <br />_ _ _ _ _A, .zoned_eaJ:.tK .dam. wi t~WRSt-ream-f-i-lter-drains-i:s -plann-ed- -- -. <br />- as shown bye t}{~ Bur~au"-s._fe&.sibili ty design drawings, <br />Figures 3 and 4~The maximum section has an approximate <br />height of l47'feet~bove streambed. The total crest length <br />is abou~2~,50~~f~e~which includes a considerable length <br />of low/abutment\dikes 'for flood storage purposes. The <br />bedrofk~t th~site r~ the Pierre formation consisting of <br />shay.ey/Siltstone'and~aystoe~ The generally pervious over- <br />bu~den soils ar~ telat~vely s allow on the left abutment, <br />acrbss'the stre~~ channel and partially up the right channel <br />slope~~ut,pe96~~ deep onfue right abutment. The current <br />Bureau feasfbility stage design contemplates a complete <br />" ' <br />cutoff trencQito bedrock from the left abutment to about <br />Station 278 onthe right abutment. From this location <br /> <br />COnSlJ'r\lf'll) Engmeers. Geologists <br />i-lnd EnwQnmenlal SClenllsts <br /> <br />~""'" <br />.. <br /> <br />Otllces in Other PrinCipal Cilles <br />