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1 INTRODUCTION <br />This is a report of the flooding of September 11 -18, 2013, on the Little Thompson River from the <br />headwaters to above the X Bar 7 Ranch. The study location is shown on Figure 1 below and is <br />generally located in southeastern Larimer and northwestern Boulder Counties. <br />Fan comns <br />r <br />Larimer <br />Drainage Basins for '�. ypyplsnE <br />Litt le Thompson River <br />Flooding Investigation <br />�1 <br />Lungmn Weld <br />Boulder 6 <br />j Gilpin Jefferson - A.dams <br />ti <br />COLORADO BAGlE K WADTIGrt <br />Divis:¢n cf Vla:er escurces 61G ELK MEVESTG s <br />DAM iAILl1RE5 IHVE5TIGATgn i <br />DAM SAFETY BRMCH A.. 2014 <br />Figure 1— Map of Study Area of September 8 -18, 2013 flooding on the Little Thompson River <br />This report is intended for a relatively wide audience that includes the general public that were <br />impacted by the flooding, the general public who may not have been affected but have an <br />interest, the legal community, floodplain managers, dam engineers, emergency managers and <br />others in the science and technical communities. There are many facts to be described and also <br />some hypotheses to be discussed. This was a complex disaster from almost every aspect and no <br />one agency or entity is able to describe with total accuracy all events of the flooding and damage. <br />This report presents the best information available at the time to members of the investigation <br />team comprised of geologists, hydrologists, and civil engineers with high levels of education and <br />experience in the analysis of flooding, dam design and dam failure. Methods do not exist to <br />account for many of the factors that impacted the magnitude of flooding and resulting damage <br />Report of the September 2013 Little Thompson River Flooding COLORADO <br />and Big Elk Meadows Dam Failures, June 2014 (Revised, Dec 2014) * Division of Water Resources <br />Page 1 of 48 - b partrnent nt Matura4 Gesourc , <br />DAM SAFETY BRANCH <br />