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CONTENTS Plate 1. Map showing topography of Lawn Lake before and after flood of July 15, 1982, Rocky Mountain National Park, Colorado----------------------------------------------- In pocket 2. Map showing topography of Cascade Lake before and after flood of July 15, 1982, Rocky Mountain National Park, . Colorado----------------------------------------------- In pocket Figure 1. 2. 3-10. 11. Location map of area between Lawn Lake dam and Lake Estes--- Graph showing long profile of the flood path of the water from Lawn Lake dam and Cascade Lake dam failures---------- Photographs showing: 3. Lawn Lake dam and reservoir prior to failure (July 11, 1958) (aerial)---------------------------- 4A. The top of Lawn Lake dam, prior to failure, looking north (July 11, 1958)----------------------- 4B. The top of Lawn Lake dam after failure (July 1982)----------------------------------------- 5. The cross section of Lawn Lake dam following failure--------------------------------------------- 6. The remains of the outlet valve from Lawn Lake dam-------------------------------------------- 7A. The downstream face of Lawn .Lake dam prior to failure, showing the location of the outlet well and pipe (July 11, 1958)----------------------- 7B. The front of Lawn Lake dam following failure, showing the breach width---------------------------- 8. Empty Cascade Lake prior to failure. View is toward upstream face of dam (date unknown)---------- 9A. Water overtopping Cascade Lake dam-------------------- 9B. Cascade Lake dam in the initial stages of failure----- 9c. Cascade Lake dam taken a few seconds after photograph 9B--------------------------------------- 9D. The location of Cascade Lake dam immediately after total failure--------------------------------------- 9E. The location of Cascade Lake dam following the failure and draining of Cascade Lake---------------- 10. The middle reach (river mile 2.1) of the Roaring River showing the extensive areas of scour and fill along the channel------------------------------ Graph showing peak-discharge profile based on indirect peak-discharge measurements and model results------------- Photograph showing Lawn Lake about 1 week after the dam failure, showing the amount of water still remaining in the natural depression forming the original lake (aerial)- 12. iv Page 4 7 9 10 10 11 13 14 14 15 16 17 17 18 18 21 23 25