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• <br />INTRODUCTION <br />Construction of-high dams in-the Western United States-has often-, <br />had far-reaching effects on the rivers impounded. The river environ- <br />ment is changed in the impounded segment and water drawn from deep in <br />._-'_a: large--reservoir-into -the- tailwaters is usually -c-Lear-er-and -colder= , - z <br />than before. Other changes in water quality may be associated with <br />the chemical limnology of the reservoir. Severe fluctuations in water <br />eves y ocetrr -both the reservo ir--and--tailwat-erg .? =:- <br />The Colorado River Storage Project is a long-range program.by the <br />United States Bureau of Reclamation to develop the water resources of <br />ire---ldpgtlr-'Cflloratlo,=River=drainag?=e?€--.#hich -Flaming Gorge -Dam and <br />voir are a part. Flaming Gorge Dam is an arch-type concrete structure <br />455 feet high located on the Green River in the northeastern corner of <br />..--a-=. <br />1Ttdti:..-„Pozaer 3131r'orFcie'tY?if auitl"V&t'er'-8torage -are-tke- 1pr-rotary" -purpose sl.? ;- <br />the structure. Total hydroelectric capacity of 108,000 KW is produced <br />by three generators each of which is supplied with water by a 10-foot- <br />diameter -'penstock: Water-tray also"'tie-passed''thro-agh the-16wer -outlets <br />or over the spillway. Since impoundment, however, most of the water <br />has been released through the penstocks. <br />Before the dam was 'tlosed in November'bf 1962', a large scale- fish-•' <br />eradication program was conducted on the Green River to suppress un- <br />desirable fish populations to allow establishment of a trout sport fish- <br />ery in the reservoir and -tailwaters `'- This-was a' jointaction by y e-U-.- - <br />0 S. Fish and Wildlife service and the states of Wyoming and Utah. Approxi- <br />mately 21,495 gallons of an emulsified rotenone formulation, Chem-Fish