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<br />0007-'18 <br /> <br />visual observations of Landslide Areas C and D during the reservoir draw down operation. <br />Survey monument movements greater than 2 inches would stop the reservoir draw down. <br />AdditiooaJ data would be collected and evaluated to determine if the draw down could cootinue. <br /> <br />A review of reservoir operations from 1973 to present, shows that the end of day reservoir <br />elevations has not been lower than 7,140 ft since 1996, Table I shows the daily frequency of <br />reservoir elevation from 1973 to present between 7, 102 ft. and 7,144 ft. <br /> <br />Small landslide movements are anticipated during the reservoir draw down and would have <br />minimal affect on downstream water quality if releases from Morrow Point Reservoir were <br />adjusted to allow sediment settling in Morrow Point and Crystal Reservoirs, <br /> <br />A sudden release of a large landside mass could increase sediments in Morrow Point Reservoir <br />and possibly downstream of Crystal Reservoir resulting in impacts to recreation and trout <br />spawning'sites. Such an occurrence could also create a wave that could overtop Morrow Point <br />Dam and pose a safety threat to persons on the reservoir and immediately below the dam. <br />However, c.hances of large, rapid movements are considered to be very remote. <br /> <br />Fish and Wildlife Resources <br /> <br />The Gunnison River and its canyon walls support wildlife including beaver (Castor Canadensis), <br />mule deer (Oc/ocoilells hemionlls). ringtail cat (BassarisclIs astwus), great homed owl (Bubo <br />virginianlls), western fence lizard (Seelopoms occidenwlis), yellow warbler (Dendroica <br />petechia), rainbow trout (Oncorhynchus mykiss) and brown trout (Salmo trotta) (NPS 2001). <br /> <br />The Colorado Division of Wildlife (CDOW) manages the fishery resource of the Gunnison River <br />below Crystal Reservoir. This stretch of river has an excellent rainbow and brown trout fishery. <br />These populations are self-sustaining: however, whirling disease has greatly reduced recruitment <br />for rainbow trout. The CDOW conducts an annual fall (September) survey on the Gunnison <br />River below the Black Canyon of the Gunnison National Park, CDOW stocks Morrow Point <br />Reservoir with Kokanee (Oncorhynchus nerkus) and Colorado River cutthroat trout <br />(Oncorhyncus clarki plellriticus), Entrainment from Blue Mesa Reservoir also provides a <br />significant number of fish in Morrow Point Reservoir (Hebein, 200 I). <br /> <br />Fish species lists for both Crystal and Morrow Point Reservoirs are identical even though the <br />sources of species vary. These include Kokanee, Colorado River cutthroat trout, rainbow trout, <br />brown trout, brook trout (Salvelillllsjolltillalis), possibly Snake River cutthroat trout <br />(OncorhYllcus clarki sp,), Mackinaw or lake trout (Salvelinus namacllsh), longnose sucker <br />(Catostomus calOstllmus), white sucker (Carostomlls commersolli), bluehead sucker (Ca/ostomus <br />discobollls), longnose dace (Rhillichthys catarac/ae), and mottled sculpin (COitUS bairdi). <br />Hybridized remnants of flannelmouth sucker (Catos/olllus latipillnis) may also be present <br />(McAda 2000, Hebein 200 I). <br /> <br />12 <br />