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Last modified
1/26/2010 12:29:52 PM
Creation date
10/11/2006 10:15:58 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.101.10
Description
Colorado River-Water Projects-Glen Canyon Dam/Lake Powel-Glen Canyon Adaptive Management
Basin
Colorado Mainstem
Water Division
5
Date
11/5/2004
Author
DOI-BOR-NPS-GCMRC
Title
Draft Supplemental Environmental Assessment-Proposed Experimental Actions for Water Years 2005-2006
Water Supply Pro - Doc Type
Report/Study
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<br />Proposed Water Year 2005-2006 Experimental Actions <br /> <br />01.820 <br /> <br />15 <br /> <br />would occur with or without sediment triggers under the Proposed Action, would result <br />in lower densities of drifting organisms and thus could affect feeding activity among the <br />trout sought by anglers, <br /> <br />High Experimental Flow <br /> <br />A high experimental flow in November-December could impact anglers and guides in <br />the Lees Ferry reach more than the January flow because of the shorter notice and <br />subsequent difficulty in rescheduling, Angling following the flows is expected to <br />improve with rejuvenation of the benthic algae and invertebrate communities that form <br />the food base for trout. <br /> <br />Non-native Fish Suppression Flows <br /> <br />Increased daily fluctuations during the period January-early April under the Proposed <br />Action are expected to produce more drifting organisms than flows under the No <br />Action, The periods of ramp up and ramp down in daily fluctuations are little affected <br />by the Proposed Action and occur on cycles that have little impact on anglers' ability to <br />access the fishery, <br /> <br />Mechanical Removal of Non-native Fish <br /> <br />In the Lees Ferry fishery, there should be no effecl from this action, The reason for this is <br />that the mechanical removal is being conducted well downstream of the fishery. No data <br />are available on trout fishing downstream between the Lees Ferry fishery and the <br />confluence of the Little Colorado River, Based on the results of the mechanical removal <br />experiment, we expect that the number of trout has been and will continue to be <br />reduced, TI1is would be an adverse effect on anglers; however, this area is so little used <br />that it is not considered significant or measurable, <br /> <br />Recreational Activity: BOilting, Camping and Day Use <br /> <br />Alternating Low Steady and Low Fluctuating Flows <br /> <br />TIlere is little discernable difference in recreational boating and camping experience <br />anticipated belween the low fluctuating flows under the No Action and the sequential <br />low steady and low fluctuating flows under the Proposed Action, The daily stage <br />change would vary from no change under steady flows to approximately one and one- <br />half feet under low fluctuating flows, These stage differences are not expected to <br />measurably affect access to camping sites, tending of boats and equipment, or the <br />aesthetics of the river running experience. <br />
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