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<br />.::ti,.~ <br />..... <br /> <br />000356 <br /> <br />Crystal <br />Reservoir <br /> <br />, ( II / <br />I \t ( ----;i <br />~) oj) <br />'/ .( <br />, i' <br />. If . <br />o " <br /> <br /> <br />I <br /> <br />'" <br /> <br />poil1t <br /> <br />\ <br /> <br />'- <br />."__----.. -90r,"'ao' <br />~~'C,.~ <br /> <br />---~, <br />,.", <br />\~ <br />'.~ <br />',' <br /> <br />. <br />'''- <br />':0 <br /> <br />, , <br />j Morrow Point Landslide Areasi <br /> <br />I . Landslide Are.u <br />, <br />: 0 0.5 1 Miles <br />! <br /> <br />:'............. <br /> <br />6. <br /> <br />N <br /> <br />Figure J-Morrow Point Landslide Areas <br /> <br />II )fii <br />\ I 1/ l <br />I 0 01 <br />~I i/ ~ <br />i <1;, ~I 0 <br />\ / ~) \ <br />(i ;' \ <br />\: \ <br />, <br />, , <br />/ .) <br />ReservOir <br /> <br />8fUll Mft8 <br />Reservoir <br />\ <br /> <br />" <br /> <br />,1 <br />"-"\'-1. <br />, ~ <br />"~ <br /> <br />,~ <br />, <br />.\ <br /> <br />---/' <br />,~ <br /> <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 D. Cracks outlining the slide can be traced' along the west and top portions but <br />were onlyobserved intermittently along the east 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 D 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 D during the reservoir draw down operation. <br />12 <br />