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<br /> <br />SOUTH PLATTE RIVER, <br />COLORADO <br />CHATFIELD DAM AND LAKE <br />h <br /> <br />SUPPLEMENT NO.1 <br />DESIGN MEMORANDUM <br />NO. PC-20 <br />PHASE I REPORT <br /> <br />DOWNSTREAM <br />CHANNEL <br />IMPROVEMENT <br /> <br />VOLUME I OF n <br />SUMMARY REPORT AND APPENDIX 1 <br /> <br />DECEMBER 1976 <br />