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Last modified
7/14/2009 5:02:31 PM
Creation date
5/18/2009 12:29:36 AM
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UCREFRP
UCREFRP Catalog Number
7845
Author
Miller, W. J. and D. Laiho.
Title
Final Report, Upper Colorado River Basin Recovery Implementation Program, Feasibility Evaluation Of Non-Native Fish Control Structures.
USFW Year
1997.
USFW - Doc Type
\
Copyright Material
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1 <br />1 <br /> <br />k?] <br />J <br /> <br /> <br />1 <br />r <br />1. INTRODUCTION <br />Control of non-native fishes is one element of the endangered fishes recovery program in the upper <br />Colorado River basin. In particular, it is thought that chronic escapement of non-native fishes from <br />off-channel impoundments is associated with mortality or competition that may limit recruitment of <br />endangered fishes. It is believed that fish control structures emphasizing mechanical means can <br />effectively limit this escapement. <br />This study directly relates to the Recovery Action Plan's (USFWS 1993) following sections for the <br />Colorado mainstem and Yampa/Little Snake Rivers: <br />• III. Reduce Negative Impacts of non-native fishes and sport fish management activities (non- <br />native and sport fish management) <br />• III. A. 2. Identify and implement viable control measures <br />• III. A. (c). Implement and evaluate the effectiveness of viable active control measures <br />• III. B. Reduce negative impacts to endangered fish from sport fish management activities <br />• III. B 2. Evaluate control options and implement control non-native fish escapement from <br />Elkhead Reservoir. <br />1.1 Purpose of Study <br />The purpose of this study was to examine the feasibility of constructing on-site facilities to control <br />escapement or downstream movement of non-native fishes from large off-channel dams or reservoirs <br />on tributaries to mainstem rivers in the Colorado River basin. The study focused on Elkhead and <br />Highline Reservoirs as physical facilities where escapement control may be particularly beneficial. <br />Both Elkhead and Highline Reservoirs are located on streams which are outside of habitat occupied <br />by the endangered species. However, both streams enter the mainstem rivers, Yampa and Colorado, <br />respectively, upstream of or within critical habitat reaches. <br />1.2 Objective <br />Personnel from the Bureau of Reclamation, U.S. Fish and Wildlife, Colorado Division of Wildlife, <br />Colorado Division of Parks, and Colorado Water Conservation District involved with the Upper <br />Colorado River Basin Recovery Program and familiar with the non-native fish issues at the target <br />reservoirs were asked for their input on the nature and magnitude of the escapement problem <br />including life stages and particular species of concern. This ad hoc team identified two main <br />objectives for the evaluation. The first objective was evaluation of an alternative to contain egg size <br />and larger life stages for levels of flow up to the 100 year flow event and at an effectiveness as close <br />to 100% as possible. After a preliminary review of current control technology and the associated <br />costs with 100% control, the team recommended a second objective. The second objective was to <br />evaluate an alternative to reduce escapement from the reservoirs to the current industry standard of <br />practice and at a 90% or higher efficiency up to the 100 year flow event. <br />1.3 Overview of Existing Control Technology <br />Fish passage generally consists of three major subject areas: 1) upstream movement, normally by <br />adult fish to spawn or to reach seasonally occupied habitat; 2) downstream movement, normally by <br />Control Structure Feasibility Evaluation <br />Miller Ecological Consultants, Inc., February 18, 1997 <br />1-1
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