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ii. . . - ~~ Av;,l~nche paths on the east side of Barthoud Pass cross Hlghwat 40 In t~o locations (center, bottom). Note the lack of trees In each of the paths, Indicating the frequency of avalanche activity. SUCh as debris flows, occupy the same area. Non-occupancy structures which are placed In avalanche paths and runout zones should be designed tor 9Kpected Impacts _even If some other pl'"eventatlve measures are Implemented. Portions of powerllnos, hIghways, raIlroads and other facilIties otten have to be buIlt to withstand avalanches. Case History Seven persons sleeping In their beds were swept to a frigId dool1l In i!I predawn avalanche at Twin Lakes, Coloredo, on Janu"ry 21, 1962. Two persons and a spotted puppy miraculously surylved. The 3Y313nche raced do~n Gordon GulCh on 12.676 toot high Perry Peek, traveling some 9,000 feet at yery high speed over 2,800 vertical teet. It. topped a 100 toot high natural bo!lrrier and demolished everything In Its path Including seven buildings and a house trailer. The remains at one house ~ere found 500 feet from the foundo!lt Ion. Two cars, three trucks, t..o piCkUp trucks o!Ind other equipment ~ere crumpled. State hlgh~ay 82 ..as under a teet of packed sno. and po..er and hlephone lines ..ere ripped out for 1,000 leet. Many at the victims ..ere stl I I wrapped In their blankets on their mattresses and ~ere buried alive under as much as 12 teet of snow. The injured survivors ..ere burled more than four hours betore rescue. They were Sheltered by debris although sti I I trapped under the snow. Rescuers found hard $no'Ol slabs J teet across and 18 Inches thick that had survived the high speed trip from near the summit of the peak. The snow was 10 feet deep ~here It broke away. Enroute It launched t~o other sl Ides from adjacent tracks. It was later determined that avalanches had topped the 100 toot high glacial moraine at least twice before (In 1899 and 19161, a t<!lct confirmed by counting tree gro'Olth rings on l<!Irge 70-year-old aspen ..hlch had been snapped off and carried along by the sno.. flhll e the moral ne ord I nar II y had shet tered the viii age on the northwest side of T.in Lakes Reservoir, It was Inadequate tor this very l<!Irge avalanche. The site of the tragedy Is stll t evident, although nature has begun healing the scars "Ith new vegetation. Case History On the afternoon of February 23, 1961, ho .omen left the groomed sid s lopes at Aspen to sk I In unb' em I shed sno" of a small basin near the maIn ski run. The ayalanChe hazard ~as high and warnings had been published and posted. 35