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.._ , <br />., <br />er~_~ <br />-~ <br />~„~ <br />~~ '~~' <br />.. .,~ , .. <br />~d~',~` ~ <br />~< <br />`_• ~` , <br />Figure 4. View of outlet net and spillway. <br />Study Goals and Objectives: <br />~ , <br />"~....~, <br />" Y~ <br />~ ~~ <br />~--@ w <br />~~c ~~~ <br />~.. ~v'.+G ,n .n <br />The study goal was to document magnitude and characteristics of escapement of nonnative fishes <br />from Elkhead Reservoir to guide design and operational criteria for potential screening, refine <br />sportfishery management, and evaluate translocation of nonnative fish from Yampa River <br />removal actions. Escapement of fish eggs and larval forms were not included in the study due to <br />the obvious impracticalities in preventing escapement through screening devices. <br />The objectives of this study were: 1) Quantify escapement of fishes from Elkhead Reservoir by <br />species and size during spring runoff; 2) Recommend the design and operational criteria for <br />screening reservoir outflows that would be most effective for minimizing escapement; and 3) <br />Evaluate escapement rates of nonnative gamefish relocated from the Yampa River to the <br />reservoir. <br />METHODS <br />This study relied solely on nets placed in the spillway and on the reservoir outlet during high <br />flows associated with the spring runoff to determine escapement. The nets used in this study <br />were tailrace nets normally designed for hydroelectric projects. These nets consisted of a face <br />FINAL REPORT -Elkhead Reservoir Escapement, Project No.: 118 Page 4 <br />Miller Ecological Consultants, Inc. May 20, 2005 <br />