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. -, '~ ST.iTE! OF COLORADO RICHARD O. LAMM. Govo,"o, I 'D~~~~S~~~::iV~:c~ATURAL RESOURCES 1313 Sherman St., Room 718, Oenve,. Colorado 80203 866-331.1 Board of Lafld C-ornmissioners Division of Administration Division of Yines Division of Parks & Outdoor Recr~:;~' Division of Water Rosources Division of Wildlife Geological Survey Oi I and GIlS Consefvatl on COiTlml 5S ~ SoH Conservation Board Wate~ Conservation Soard Mined land Aeelamation TO: Governor Richard D. ~amm Monte pas~ July 22. 1982 FROM: DATE RE: Lawn Lake Dam Failure The failure of Lawn Lake Dam resulted in the tragic loss of life and in extensive damage to property. ThLS memorandum reports on the investigation into that failure. In addition, it reports on the dam inspection activities of the state ~ngineer and two related programs. the five year capital investment plan. ~bich included rehabilitation of thirty-four dams and the Colorado Water Conservation Board's floodplain management activ1ties. ~The Lawn Lake failure raises continuing, perplexing and troublesome questions about how our cLtizens can be protected from future flooding and how capital can be made available to maintain and rehabilitate the many dams in this state, built in many instances before and around the turn of the century, that are so vital to the life and welfare of our citizens, These questions have become more acute in recent years as a result of rapid urbanization in many areas of the state, The activities reported on in thLs memorandum describe what I believe to be very substantial progress in addressing taese questions. "However, much remains to be done. I. Attachment A is an inspection report showing the status of the Lawn Lake investigation by the State Engineer's Office. It contains findings about the reseryoir. several conclusions. and recommendations for further work. State officials began their stage 2 data gathering today. Attachment B describes the work to be done. r. '-''''' II. This portion of tne report describes the State Engineer's dam inspection program and responds to questions in your memorandum of July 16. Since 1978 Lawn Lake has been investigated under the federal program described below, Attachment C 1S a chronology of activities comprising chose investigations. the dam was checked at least twic~ since .~'...,."<;:~;~".;:;.