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FLOOD06904
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Last modified
1/25/2010 7:10:17 PM
Creation date
10/5/2006 2:35:07 AM
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Template:
Floodplain Documents
County
Larimer
Basin
South Platte
Title
Hydrology, Geomorphology, and Dam-Break Modeling of the July 15, 1982 Lawn Lake Dam and Cascade Lake Dam Failures, Larimer County
Date
1/1/1986
Prepared For
Larimer County
Prepared By
USGS
Floodplain - Doc Type
Flood Documentation Report
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<br /> DESCRIPTION OF FLOOD,WAVE CHARACTERISTICS 23 <br />TABLE 6.-Time of flooding from the failures of Lawn Lake dam and Cascade Lake dam, July 15, <br /> 1982 <br /> (Modified from Graham and Brown, 1983] <br />Location and <br />"""""" """" <br />downstream (mountain Description 8<>w'<o <br />from Lawn Lake, daylight of occurrence <br />in miles timo) <br />Lawn Lake 0200 Campers report hearing roar. N ationa! Park Service <br />Camping 0400 witness statements. <br />area (0) <br /> Approximately Campers report normal roar Rocky Mountain News, <br /> 500 from river. July 16, 1982, psge 8. <br /> Shortly before Dam failure begins. Rocky Mountain News <br /> 0530 July 16, 1982, page 8. <br /> Approximately Campers heard roar from dam National Park Service <br /> 0550 break. witness statements. <br /> 0609 Camper reports roar getting Rocky Mountain News <br /> louder. July 16, 1982, page 8. <br />Cut Bank (2.41) 0600 Campers heard thunderous National Park Service <br />and Ypsilon 0620 roar and trees breaking; witness statements. <br />Creek Camp- saw wall of water 25 to <br />sites (2.92) 30 feet high <br />Endovalley Approximately Water reaches road. N ationa! Park Service <br />Road (4.54) 0615 witness statements. <br /> Approximately Water and debris (logs and N ationa! Park Service <br /> 0620 limbs) on road, witness statements, <br /> 0627:40 Road completely flooded. National Park Service <br /> dispatch'radio log. <br />Lawn Lake 0622:47 Call by Stephen Gillette National Park Service <br />Trailhead to park dispatcher, dispatch-radio log <br />emergency end tape recording. <br />telephone <br />(5.23) <br />Highway 34 0634 Flood reaches highway. National Park Service <br />in Horse- dispatch-radio log. <br />shoe Park <br />(5.31) <br /> 0636 Water over bridge. N ationa! Park Service <br /> dispatch-radio log. <br />y, miles west 0657 Water at this location. N ationa! Park Service <br />of Cascade dispatch-radio log. <br />Lake dam <br />(6.17) <br />Cascade Lake 0700 Watar 4 to 5 inches over Interview with Cascade <br />dam (6.67) Cascade Lake dam (usually Cottages owner <br /> 5 inches below top of dam (manager). <br /> at thia time of day and <br /> season). <br /> 0715 Rapid rise in water. Interview with Cascade <br /> Cottages owner <br /> (menager). <br /> 0723 Increased water. National Park Service <br /> dispatch-radio log. <br /> 0725 Water going over dam. National Park Service <br /> dispatch-radio log. <br /> 0742 Cascade Lake dam fails. National Park Service <br /> dispatch,radfo log. <br />Aspenglen 0731:39 Watar over entrance road. N atienal Park Service <br />Campground dlispatch-r~o log <br />(7.03) and tape recording. <br /> 0745 Trees breaking end N atienal Park Service <br /> increase in flood, dlispatch-r~o log. <br /> doubled in size in <br /> 30 seconds. <br /> 0747:37 Surge passed. National Park Service <br /> dispatch-radio log. <br />
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