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Last modified
7/28/2009 2:39:11 PM
Creation date
4/18/2008 10:01:02 AM
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Template:
Weather Modification
Title
Colorado River Augmentation Demonstration Program - Finding of No Significant Impact
Date
9/1/1985
Weather Modification - Doc Type
Report
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<br />many reservoi rs wi th rai nbOlI/ trout. St reams in the upper el eva- <br />tions of the mesa have good trout fisheries; however, irrigation <br />diversions in the lower reaches seriously reduce their capability <br />to sustain fisheries. <br /> <br />Impacts. - No impacts would occur to lake, reservoir, or stream <br />fisheries since no signific.ant changes would occur to water resources. <br /> <br />5. Wil d 1 if e <br /> <br />Herpetofaunal species believed to be present in the area include the <br />tiger salamander, boreal toad, boreal chrous frog, leopard frog, <br />western smooth green snake, and desert short-horned lizard. <br /> <br />Bird species found in the area are migratory birds, waterfowl, <br />raptors, and nongame birds common to elevations above 9000 feet. <br />Upland game birds inhabit lower elevations. Waterfowl production <br />on the numerous lakes and reservoirs of Grand Mesa contributes <br />significantly to the population that winters in west-central <br />Colorado. Burkhard, et al (1979) contains a detailed discussion of <br />birds of the general are~ <br /> <br />A variety of small mammals (shrews, bats, chipmunks, mice, marmots, <br />mink, beaver, muskrat, marten, etc.) have been identified in the <br />area or are cited in the literature as probable residents of the <br />area. Large mammals on Grand Mesa include mule deer, elk, a <br />moderate population of black bear, and a small number of mountain <br />1 ion. <br /> <br />The deer and elk on Grand Mesa are part of large herds that range <br />from the Muddy Creek drainage on the south to the Colorado River <br />on the north. Aspen areas and meadows provide most of the cover <br />and food utilized by deer and elk during the summer months. The <br />major portion of the deer population is distributed throughout <br />elevations above 8500 feet during the summer (April through <br />November) and utilize lower elevations, primarily a narrow band <br />between 7500 and 8500 feet, in winter (December through March). <br />Elk summer mostly above 8000 feet, and move to winter below <br />9000 feet. Timing is dependent upon weather patterns and snow depths. <br />The return trip in the spring generally coincides with receding snow <br />and grass green-up. These movements occur in relatively short <br />stretches, and do not constitute large concentrations of animals in <br />mass migrations along definable routes. <br /> <br />~ <br /> <br />The key factors that affect mammal populations are the availabi- <br />lity of winter habitat, and, for deer and elk, timing of migration <br />and the hunting seasons as established by the State Oivision of <br />Wildlife. Farming and residential development at lower elevations <br />are gradually depleting available winter and spring food sources <br />and interrupting normal migration. <br /> <br />19 <br />
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