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WSP11877
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Last modified
1/26/2010 3:19:10 PM
Creation date
10/12/2006 5:15:09 AM
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
9/1/2002
Author
DOI-BOR-NPS-USGS
Title
Proposed Experimental Releases from Glen Canyon Dam and Removal of Non-Native Fish-Environmental Assessment
Water Supply Pro - Doc Type
Report/Study
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<br /> Proposed Action <br /> No Action <br />Resource Alternative <br /> Experimental Dam Releases Mechanical <br /> Removal <br /> 6.000 cfs 6,500-9,000 cfs 5,000-20,000 31.000- 42,000-45.000 <br /> steady flow fluctuating flow cfs fluctuating 33,000 cfs cfs high flow <br /> flow high flow <br /> ..--....- -~_._._-- ---~---- loss of lilter ....~ <br /> reduction in of lilter and <br /> backwaters and understory <br /> and understory vegetation at <br /> increases in vegetation at nest sites; long- <br /> woody plant nest sites; term benefits to <br /> establishmen long-term habitat through <br /> t benefits to increased <br /> habitat seedling <br /> Ihrough establishment <br /> increased and clonal <br /> seedling species <br /> establishmen expansion <br /> t and clonal <br /> species <br /> exnansion <br />Threatened Positive and No effect No effect Increase in Short term Short term 6% <br />Species: negative turbidity may reduction in reduction in reduction in <br />Bald Eagle effects to reduce foraging river foraging river foraging foraging <br /> foraging success; due to due 10 habitat; <br /> opportunities; possible long- inundation of inundation of shift in <br /> high flows term effect via habitat and habitat and foraging <br /> temporarily reduction in increased increased location, <br /> reduce prey fish as the turbidity; may turbidity; may possibly <br /> foraging- shift affected trout shift to shift to foraging with some <br /> to tributaries, age classes foraging in in tributaries; eagles <br /> if possible; reach tributaries; decreasing leaving <br /> decreasing catchable size. decreasing flows increase area; if <br /> flows flows foraging action not <br /> increase increase opportunities repealed <br /> foraging foraging after the 2- <br /> opportunities. opportunities year test, <br /> then effect <br /> is short- <br /> term as <br /> trout <br /> oooulalion <br /> <br />0 0 <br />::; <br />Ol <br />U .- <br />ro N <br />, <br />"" <:) <br />0 ~ <br />;to> <br />iil' <br />" <br />~ <br />CD <br />D- <br />m <br />::l <br />< <br />=;. <br />0 <br />::l <br />3 <br />CD <br />"- <br />Ol <br />::l <br />D- <br />m <br />::l <br />:S. <br />0 <br />::l <br />3 <br />CD <br />::l <br />91: <br />0 <br />0 <br />::l <br />en <br />CD <br />.c <br />c <br />CD <br />::l <br />" <br />CD <br />en <br />0 <br />::l <br />"" <br />"" <br /> <br />
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