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<br />.~ <br /> <br />aDJ7Ia <br /> <br />Crystlll <br />Reservoir <br /> <br />I( J Y <br />f II--i) <br />t_\~j l) <br />(------ 11 <br />I ( ~ <br />Area {) point <br /> <br /> <br />, <br />\ <br />'~'\. <br />;Q, <br />\"?... <br />'\' <br />, <br />\' <br />~ <br />f <br />;~ <br />, \ <br />\ <br />.I ''"' <br />I \ <br /> <br />~ <br />I~~...~. <br />~~ <br />\ ....., ~C',....... <br />" '----, <br />\ " <br />I MO~ow Point Landslide Areas <br />. l.8ndSlide Areas <br />(). <br /> <br />o 0.5 <br /> <br />1 Miles <br /> <br />N <br /> <br />L <br /> <br />Figure ).l\Iorrow Point Landslide Areas <br /> <br />) ) l <br />\ ~ !I sf <br />~, ,I 8 <br />J/ ~f l..I <br />/ i!1 \ <br />'I / <br />\ \ \ <br />) " ' <br />ReservO;( <br /> <br />BI~Mes. <br />R~~/r <br />\ <br /> <br />( <br />\ <br /> <br />\;!. <br />"-', " <br />J ',~ <br />/ '\'\ <br />,/ \, <br /> <br />\\ <br /> <br />\'" <br />'. <br />\ n <br />'\ <br />"~I <br />\ <br />( <br />i <br />/, <br />( \ <br />l' \....... <br />~", <br /> <br />/ <br />{ ( <br />/ / <br />,- /-----~ <br /> <br />An area on the north shore of the reservoir 19.000 feet upstream from the dam is known as <br />Landslide Area 0, Cracks outlining the slide can be traced along the west and top ponions but <br />were only observed intermittently along the easr margin. The material has dropped about six feet <br />at the head of the area; a coarse talus deposit occurs at the top of the slide, The elevation at the <br />top is about 8,100 ft. and the average slope is 52 percent. The width of the slide at shoreline is <br />about 1,400 ft. A small slump has occurred in the main mass of the slide adjacent to the <br />shoreline, The main area has sags and depressions. which mark it as an old slide. but fresh <br />cracks observed in 1973 indicate recent movement. In 1973. nine survey points were established <br />to measure any future movement (Barnes. 1973), <br /> <br />Landslide Areas A, C and 0 may move as a result of the reservoir draw down. Draw down <br />criteria was developed by geologists and engineers from Reclamation's Denver Technical <br />Service Center and Grand Junction Western Colorado Area Office to minimize and monitor <br />landslide movement. The criteria recommends survey monitoring of Landslide Area A with <br />visual observations of Landslide Areas C and 0 during the reservoir draw down operation. <br />12 <br />