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<br />researchers to definitively determine the number and types of species <br />using the passageway. <br /> <br />The conceptual design phase of the project is underway and three <br />alternatives have been proposed by FLO Engineering, Inc., to modify the <br />GVIC diversion dam to allow for passage of Colorado Riyer endangered <br />fishes. The three alternatives are currently being evaluated by Bureau <br />of Reclamation and Fish and Wildlife personnel. Selection of the final <br />design is scheduled for spring of 1997 with intent of awarding a <br />construction contract by August 1997. Plans are for the fish <br />passageway to be operational April 1998. <br /> <br />Although the final fish passage pattern and design has not been <br />selected for GVIC, initial sentiment is that a drop structure <br />consisting of series of approximately five pools and five riffles that <br />creates a natural channel for passage would be the most preferred and <br />appropriate for this site. Also, this type of structure would be more <br />natural than the fish passageway constructed at Redlands Diversion Dam <br />on the Gunnison River. Moreover, the passage option constructed at <br />GVIC could be compared to that at Redlands to determine which type <br />might be more effective in passing sub-adult and adult Co16rado <br />squawfish at other similar instream barriers in the Upper Colorado <br />River Basin. <br /> <br />Therefore, a post-construction monitoring study would be prudent to <br />determine if endangered and other native fishes can move upstream using <br />the passageway at GVIC, particularly during low-flows. <br /> <br />IV. Study Goals, Objectives, End Product: <br /> <br />Studv Goal <br /> <br />Evaluate whether sub-adult and adult Colorado squawfish will move <br />upstream through the passage structure at GVIC; determine the use by <br />other native and nonnative fishes. <br /> <br />Objectives <br /> <br />1. Determine if sub-adult and adult Colorado squawfish and other native <br />and nonnative fishes will move upstream yia the passage structure. <br />Emphasis will be placed on upstream movement of native species <br />during low flows. <br /> <br />2. Determine the extent of movement of sub-adult and adult Colorado <br />squawfish in the immediate vicinity of the GVIC Diversion Dam, with <br />emphasis on movement upstream past the diversion dam. <br /> <br />3. Determine the utility of using the type of fish passage structure <br />constructed at GVIC as a recovery tool for Colorado squawfish and <br />razorback sucker at other instream barriers in the Upper Colorado <br />River Basin. <br /> <br />3 <br />