Laserfiche WebLink
<br />,<;; <br /> <br />Rt~.......L.~ <br /> <br />t'.1 <br /> <br />- (.';4)- / <br /> <br />" <br /> <br />INSPCCTION [,CPora <br /> <br />SU8JCCT: Lawn Luke, OC-39 <br />W. Div. I W. Di5t. 4 <br /> <br />'lYPC: 9 <br /> <br />DATE OF INSPECTION: July 15, 1ge2 <br /> <br />~ <br />~ <br />~. <br />'1 <br />~ <br />'f <br />(: <br />\. <br /> <br />This inspection was performed by Jim NorflcfCt, [ric Wilkinson, Allun Rogers, and <br />John VanSciver in a team effort. John VanScivfCr und Jim Norfleet performed a physical <br />inspection of Lawn Lake site. Eric Wilkinson and Allan Rogers performed a physical <br />lnspection of the Cascade Dam site. Refer to general paragraph below for brief <br />chronology of events as well as names of others contacted during the inspection. <br /> <br />The pUfpose of this inspection was to perform the following functions: <br /> <br />1. Gather data to help determine the cause of failure of Lawn Lake Dam. <br />2. Gather data to estimate peak discharge at the dam site due to its failure. <br />~3. Obtain aerial photo covecage from the dam site down and through Estes Park. <br />4. Gather data to help determine the reasons for failure of Cascade Dam, and the <br />number of feet of overtopping susta ined by that structure. <br />5. Gather data to help determine the peak of the routed failure hydrograph at Cas- <br />cade Lake and in Estes Park. <br /> <br />The weather for the inspection was excellent. <br /> <br />Our rostec of dams indicates the following dimensions for Lawn Lake Dam prlor to failure: <br /> <br />Height of Embankment -- 24 feet <br />Length of Embankment -- 510 feet <br />Crest Width -- 8 feet <br />Spillway Bottom Width -- 24 feet <br />Spillway Freeboard -- 4 1/2 feet <br />Upstream Slope -- Inclination 1 1/2: 1 <br />Downstream Slope -- Incllnation 1 1/2: I <br />Reservoir Capacity -- 817 Acre-feet <br />Surface area at high waterline -- 102 acres <br />Hazard Classification -- Modecatc <br /> <br />Brief Chronoloqy of Event5: <br /> <br />Time <br /> <br />Item <br /> <br />8:20 A.M. <br /> <br />Telephone notification from Eric <br />Wilkinson the Lawn Lake <br />had failed. Report confirmed by <br />radio news, and by Darold Arbuthnot <br />of the I3ureau of Reclamation (243-448 <br />