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L:J3'J REVIEW OF CERTAIN SAFETY ASPECTS OF FEASIBILITY STAGE DESIGN OF PROPOSED NARROWS DAM, COLORADO INTRODUCTION The followwg report presents observations made and conclusIons drawn from a review of pertineD.t data. docwnents. and drawings, together with a oD.e-day site I.n.spec- tion and a half-day brIefing session, aU focused on the investigations for, and the cur- rent design of, proposed Narrows Dam. The purpose of these activities has been to de- velop an assessment of the competence of the foundation of the proposed dam and the adequacy of the proposed design of the dam. In the context intended, the- assessment is restrlcted to the pr1ncipal stnlctural and geotechnIcal features of the proposed cross section of the dam, and of its foundation, in regard to their adequacy against possible catastrophic failure due to natural or operational events. The assessment does not in- clude consideration of such important features of the overall desIgn as the splllw~ys ::md the outlet works. Additionally, the assessment does not lnclude evaluation of planning concepts such as economics, water supply, reservoir operation, flood control criteria, and general benefits, but accepts statements provided on these matters at face value. TERMS OF REFERENCE The undersigned consultant, retaIned through the firm of Thomas l\-I. Leps, Inc., was authorized by United States Department of Interior's Bureau of Reclamation .Pur- chase Order No.8 07 DP 00215, dated December 5, 1977, to prepare this review report. An oral report was made at the Bureaurs Denver E. and R. Center on January 10, 1973. The following report Includes the benefit of e.'"'CchaD.ge of vIews durl.og that meeting. It was tmderstood, as between the Bureau and Thomas M. Leps, Inc., that the time available for reviewing the e.:ctenslve accumulation of investlgat1ons, studies and reports on the Narrows damsite, accumulated over more than 30 years, was limited by its early need for an Independent review. Hence, it should be accepted without reserva-I If tIOD. that the judgments expressed in the following report have had to be bused on selec- tive sampling of the voluminous records, based on e."q)erience in discerning what may I.