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<br />105"41' <br />40"30' <br /> <br />37'30" <br /> <br />INTRODUCTION <br /> <br />105'25' <br /> <br /> <br />'" <br />CI <br />Z <br />'" <br />.. <br /> <br />Crystal <br />uk, <br /> <br />22'30" <br /> <br />6.", <br />"" <br /> <br />40."21' <br /> <br />o <br />I <br />o <br /> <br />3 <br /> <br />30' <br /> <br />~I <br />n. <br />~I <br />~\ <br />c' <br />~\ <br />~. <br />\ <br />!i <br />~l <br />r- <br />I <br /> <br />EXPLANA liON <br />STATtON AND SITE NUMBER <br />IDENTIRED IN TABLE 2 <br />6" Slrlllm-geglng stltlon and number <br />1 A MleceU8neoIJS measurement site <br />Ind number <br /> <br />'--- <br />PARK i <br />"', <br />~I <br />o. <br />~I <br /> <br />_,I <br /> <br />L <br /> <br />-.-' <br /> <br />. '---. <br />8roo .--.----....-. <br />. ~ollo <br />i''fl.ow\'' <br /> <br />..J <br /> <br /> <br />2 MilES <br />, <br /> <br />1 <br />, <br />, <br />2 KILOMETERS <br /> <br />FIGURE I.-Area between Lawn Lake dam and Lake Estes. <br /> <br />Conservation Board provided historical flood data, <br />flooded area maps, and additional damage data. <br />The U.S. Bureau of Reclamation, through the West. <br />ern Area Power Administration, provided helicopter <br />transportation for the collection of data at remote Lawn <br />Lake. Wayne Graham and Curtis Brown of the Bureau <br />of Reclamation provided data on the flood traveltime <br />and warning and response to the flood. Charles Huntley <br />and Zenas Blevins, also of the Bureau of Reclamation, <br />provided computation of the inflow to Lake Estes and <br />hydrologic information. <br />The U.S. Army Corps of Engineers, Omaha District, <br />provided aerial photographs that were taken 4 hours <br />after the flood and were used to prepare topographic <br />maps of the two lakes. Other valuable photographs in <br />this report were obtained from the town of Estes Park, <br />Federal and State agencies, and from private in- <br /> <br />dividuals. These photograph sources are credited in in. <br />dividual figures. <br /> <br />THE SETTING <br /> <br />Lawn Lake is a manmade enlarged natural lake, oc- <br />cupying a moraine-dammed depression on the southeast <br />side of the Mummy Range in Rocky Mountain National <br />Park (Colorado) at an elevation of about 11,000 ft <br />(fig. 1). Local bedrock consists of Precambrian gneisses <br />and schists that are more than 1. 7 billion years old <br />(Peterman and others, 1967). Lawn Lake is fed by the <br />Roaring River, which originates upstream from Crystal <br />Lake, a higher cirque lake about 1 mi upstream, at an <br />elevation of about 11.500 ft. Downstream from Crystal <br />Lake, the valley is steep and rugged. The Roaring River <br />