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Last modified
8/11/2009 11:32:58 AM
Creation date
8/10/2009 5:12:54 PM
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UCREFRP
UCREFRP Catalog Number
9705
Author
Green River Study Plan ad hoc Committee.
Title
Study plan for the implementation and evaluation of flow and temperature recommendations for endangered fishes in the Green River downstream of Flaming Gorge Dam.
USFW Year
2007.
USFW - Doc Type
Upper Colorado River Endangered Fish Recovery Program
Copyright Material
NO
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<br />GREEN RIVER STUDY PLAN <br /> <br />4 <br /> <br />February 2,2007 <br /> <br />4. restore and maintain the channel complexity and dynamics needed for formation and <br />maintenance of high-quality spawning, nursery, and adult habitats; <br /> <br />5. provide base flows that promote favorable conditions in low-velocity habitats during <br />summer, autumn, and winter; and <br /> <br />6. minimize differences in water temperature between the Green River and Yampa River in <br />Echo Park to prevent cold shock and possible mortality to larval Colorado pikeminnow <br />transported from the Yampa River into the Green during summer. " <br /> <br />The recommendations included target flows and temperatures specific to reaches of the <br />Green River downstream of Flaming Gorge Dam because habitats of the endangered fishes, <br />hydrology, and geomorphology vary longitudinally by these reaches. Flow and temperature <br />recommendations and their anticipated effects on the endangered fishes and their habitats were <br />presented for each of three reaches (Figure 2): <br /> <br />· Reach 1 - Flaming Gorge Dam to Yampa River confluence; <br /> <br />· Reach 2 - Yampa River confluence to White River confluence; and <br /> <br />· Reach 3 - White River confluence to Colorado River confluence. <br /> <br />The flow and temperature recommendations identified uncertainties associated with their <br />implementation and recognized the importance of managing for unanticipated effects. Following <br />are uncertainties summarized from Muth et al. (2000). <br /> <br />1. The paradigm in river management suggests that the ecological integrity of river <br />ecosystems is linked to their natural dynamic character and that restoring a more natural <br />flow regime to an impaireq system is the cornerstone of rehabilitation. This paradigm <br />and the response by the endangered fishes of the Green River system are largely untested. <br /> <br />2. The recommendations assumed that future changes in flow, temperature, and sediment <br />regimes of Green River tributaries will be consistent with existing or known pending <br />biological opinions. Unanticipated changes in current tributary conditions could result <br />from modifications in the operation of existing water projects or from the development of <br />new water projects. <br /> <br />3. The physical response of the system to flows is fairly well understood, and the flow <br />recommendations are of the magnitude, duration, and frequency needed to restore much <br />of the dynamic character of the Green River downstream of Flaming Gorge Dam. It was <br />assumed that restoring physical processes and improving habitat conditions will elicit <br />positive responses from endangered fish populations, but responses of the long-lived <br />endangered fishes to the recommendations will take time and need to be monitored. <br />
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