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WSP11633
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Last modified
1/26/2010 3:18:15 PM
Creation date
10/12/2006 5:05:04 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.101.09
Description
Glen Canyon Dam/Lake Powell
State
AZ
Basin
Colorado Mainstem
Date
3/1/1994
Title
Comments regarding the Draft Biological Opinion on Operations of Glen Canyon Dam
Water Supply Pro - Doc Type
Biological Opinion
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<br />2 <br /> <br />from which effects of the proposed action are compared. Added to the <br />environmental baseline are the direct, indirect, interrelated, and <br />interdependent effects of the Federal action undergoing consultation. This <br />analysis is then measured against the definition of jeopardy which is an <br />action that reasonably would be expected, directly or indirectly, to reduce <br />appreciably the likelihood of both the survival and recovery of a listed <br />species in the wild by reducing the reproduction, numbers, or distribution of <br />that species. A jeopardy finding must be based upon detrimental impacts to <br />both the survival and recovery of a listed species. Reclamation's perspective <br />is that the call of jeopardy should be defensible with specific data and more <br />importantly, the proposed resolution of jeopardy should be based on specific <br />quantitative goals and a scientifically based evaluation process. In our <br />estimation the present document falls short of doing this. <br /> <br />The following is a discussion which examines each step in the ESA process, and <br />describes Reclamation's assessment. <br /> <br />Definino the Environmental Baseline <br /> <br />This environmental baseline must include past and present impacts of all <br />Federal, State, or private actions and other human activities in the action <br />area (CFR 402.02). The status of the endangered species below Glen Canyon Dam <br />must distinguish between those effects associated with the initial <br />construction of the dam and those associated with the operations of the dam. . <br />We believe that effects of the construction and past operations of Glen Canyon <br />Dam on endangered fish should be included in the environmental baseline as <br />they provide the basis for comparison of what has happened to the environment <br />and the resources. <br /> <br />Direct Effects <br /> <br />In the discussion of direct effects, page 21 of the DBa identified cold water <br />temperatures as the central issue limiting reproductive success and. <br />recruitment of humpback chub in themainstem. The DBO's stated goal of low <br />steady summer flows is suggested to provide improved habitat in the mainstem <br />Colorado River for larval and juvenile fish. However, scientific experts on <br />native fishes in the Colorado River system who were convened to discuss the <br />merits and detriments of flow alternatives on March 2, 1994, were not totally <br />supportive that the DBO flow scenario will provide Quantifiable benefit to <br />native fish without additional temperature modification. <br /> <br />We agree some additional benefits to endangered fish may result from <br />implementation of the flow scenario described in element 1a of the DBa. <br />However, until temperature modification is operational these benefits may not <br />improve survival and recovery of endangered fish. Page 26 of the DBO states: <br />"Flows that provide optimal Quantity and Quality of physical habitat for <br />spawning, nursery, juvenile, and adult life stages also need suitable <br />temperature regimes to make those habitats viable." This statement reinforces <br />the conclusion that without temperature modification, the flow recommendations <br />contained in the DBO are questionable as to their effectiveness, and are <br />therefore not justified. Furthermore, it is the presence of Glen Canyon Dam, <br />a past Federal action which should be contained in the baseline, which <br />accounts for the cold water temperatures, not the operations. <br />
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