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- 1 - <br />JOB COMPLETION REPORT <br />INVESTIGATIONS PROJECT <br />State U T A H <br />Project No. F-4-R-6 Name Investigations of Specific <br />Problems of Utah's Fisher <br />Job No. V Title Pre-impoundment Investigations <br />of the Green River-and Colorado <br />River Developments. <br />Period Covered: August 1. 1958 to July 31. 1959 <br />Abstract: Seventeen species of fish are know to occur in the Glen <br />Canyon pre-impoundment area at the present time. The <br />Flaming Gorge vicinity has sixteen known species. A <br />stomach analyses, which involved several species of fish, <br />tends to indicate a scarcity of food items in the two <br />rivers. There will be a scarcity of spawning areas for <br />game fish species, especially the salmonids, in both of <br />the reservoirs. At the present time, a few small trib- <br />utary streams in the Flaming Gorge area support trout <br />spawning. <br />The high turbidity and scouring action of sand undoubt- <br />edly affects the bottom fauna and aquatic plants found <br />in the rivers and large tributaries. <br />No chemical conditions were found in either of the rivers <br />or tributary streams that would be deleterious to fish <br />life. m <br />The dominant riparian vegetation along the rivers was <br />found to be tamarix and willow. There is a scarcity of <br />aquatic plants in the river proper: <br />Pre-impoundment investigations revealed that game fish <br />stocking recommendations should be considered as follows: <br />largemouth bass, rainbow trout and kokanee salmon for <br />Lake Powell, created by the Glen Canyon dam, while the <br />same species, excluding the largemouth bass, for the <br />Flaming Gorge Reservoir. <br />Objectives: The general objectives of the pre-impoundment investiga- <br />tions were to determine and evaluate the ecological con- <br />ditions at the present time and to attempt to "foresee <br />the probable conditions which may arise in the two. <br />reservoirs. Specifically, the investigations were insti- <br />tuted to: <br />