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<br />10504)' <br />40"30' <br /> <br />37'30" <br /> <br />INTRODUCTION <br /> <br /> <br />.. <br />'" <br />.. <br />< <br />.. <br /> <br />Cryslal <br />/..ok< <br /> <br /> <br />Estes Park <br />powerplant <br />'-' <br />Cascadr: , . _. . <br />Lak.~ Aspenllen I..... ~ <br />aM dtlm CamplfO\l~' / i <br />Maximum extent I ~ <br />of Pleistoeene ice ~ <br /> <br />22'30' <br /> <br /> <br />11"1-1"'... <br /> <br />40.2)' <br /> <br />o <br />I <br />o <br /> <br />I <br />a\ <br /><\ <br />~I <br />c:' <br />~I <br />z' <br />I <br />!i <br />~i <br />,"' <br />I <br /> <br />PARKj <br />lO, <br />~I <br />S' <br />~I <br />_.1 <br />.J <br />r' <br />.~. <br />~ <br /> <br />l <br /> <br />2 MIL.ES <br />, <br /> <br />1 <br />, <br />, <br />2 KIL.OMETERS <br /> <br />3 <br /> <br />30' <br /> <br />)05"25' <br /> <br />EXPlANATION <br />STATtON AND SITE NUMBER <br />IDENTIF1ED IN TABLE 2 <br />6" StrQm-pglng _Ion _ nllmber <br />14 Mileellln""s meuuremlnt ... <br />atId number <br /> <br />FIGURE I.-Area between Lawn Lake dam aod 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 msnmade enlarged natural lake, oc- <br />cupying a morain&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. It. 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 /> <br />'1-2- <br />