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Last modified
7/14/2009 5:02:32 PM
Creation date
5/20/2009 3:24:48 PM
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UCREFRP
UCREFRP Catalog Number
8089
Author
U.S. Bureau of Reclamation.
Title
Final Environmental Assessment Gunnison River Activities, Passageway Around the Redlands Diversion Dam and Interim Agreement to Provide Water for Endangered Fish.
USFW Year
1995.
USFW - Doc Type
Grand Junction, Colorado.
Copyright Material
NO
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Concerning the need to use the same water to meet several uses, it is the intent of Reclamation <br />that provisions and water under the interim agreement and under future long-term agreements <br />meet as many needs, for example endangered fish and Black Canyon of the Gunnison National <br />Monument needs, as possible without "stacking" the water for these needs. <br />It is recognized that increased releases from Blue Mesa Reservoir will improve water quality <br />during low flow periods. This is because salinity and other concentrations increase during low <br />water periods and the high quality of water in Blue Mesa Reservoir serves to dilute these <br />concentrations. <br />Endangered Species <br />Several groups and individuals expressed support for the efforts to recover the endangered fish <br />and the associated Colorado River ecosystem. It was stated that it was important that the final <br />EA include language that the city of Grand Junction and the Redlands Diversion Dam facilities <br />would not be placed in a position of "takings" (harming in some manner) of the endangered fish <br />that would become more common in the vicinity of their facilities. <br />Clarification on the present status of endangered fish species in the Gunnison River is needed <br />in the final EA based on several comments received. Also, questions were asked on the type <br />of non-native fish present and why is it important to keep non-native fish from moving upstream. <br />One reader thought the idea of keeping non-native fish from moving upstream was laudable, but <br />not practical. It was also brought up that "tinkering" via a fish passageway could actually harm <br />the native fish and should be scientifically studied before the project continues. <br />Additional information was requested on the basis for the 300 cfs flow number below the <br />Redlands. One person stated that the 300 cfs is probably much greater than historically <br />occurred in some dry periods, and lower flows should be monitored also. <br />Questions were asked about how far upstream habitat for the endangered fish goes and what are <br />the limitations. <br />One writer indicated that the program to reintroduce endangered fish into the Gunnison River <br />should be deferred pending a full EIS of all reasonable alternatives. <br />Selenium levels in the Gunnison River were mentioned in the EA but more information is needed <br />on the significance of this to the fish. In general how has water quality changed over the years, <br />and how has this affected the fish. <br />The fish passageway forebay, where the entrance to the 42-inch bypass pipe, baffled chute, and <br />24-inch Grand Junction pumping plant intake are located, is protected by two sets of trash <br />screening devices. The screening devices prevent floating debris from entering and obstructing <br />the fish passageway structure and also prevent fish from being drawn into the Grand Junction <br />pumping plant intake. The initial screening device consists of a rack of vertical steel bars with <br />52
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