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<br /> <br />j <br /> <br />> <br /> <br /> <br />j <br />I <br /> <br />i i i <br /> <br />EXECUTI YE SUMNARY <br /> <br />... <br /> <br />Introduction <br /> <br />Flaming Gorge Dam was completed by the U.S. Bureau of Recla- <br />mation (USSR) in 1962 and at that time a trout fishery was esta- <br />blished by the Utah Division of Wildlife Resources (UDWR) in the <br /> <br />ta il wa te r . <br /> <br />Initially good trout growth steadily declined as the <br /> <br />reservoir filled and the hypolimnetic discharge water cooled. <br /> <br />Adjustable penstock modifications were added in 1978 which raised <br /> <br />the summer water temperature from 5 to 13 C, and resulted in an <br /> <br />~ <br /> <br />improved growth rate in the trout. <br /> <br />The primary objective of this study was to evaluate the po- <br /> <br />tential effects of a proposed peaking power regime on the trout <br /> <br />fishery. Specifically, the study was to provide microhabitat <br />data for use by USSR personnel with the fish habitat model devel- <br /> <br />. <br /> <br />oped by the USFW Cooperative Instream Flow Group. <br /> <br />Thi s model <br /> <br />would then be used to evaluate the physical effects of a proposed <br />peaking power flow regime. Data were collected in 1981 during <br /> <br />winter and summer for rainbow and cutthroat trout. The data were <br /> <br />stratified by river flow, species and life stage, and activity of <br />the fish. A secondary objective was to collect invertebrate sam- <br /> <br />ples and provide vegetation data fram the river for use in <br /> <br />modeling. <br /> <br />During the winter of 1982, a test was conducted on the ef- <br /> <br />fects produced on the trout by sustained high flow releases <br />