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WSP09734
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Last modified
1/26/2010 2:55:31 PM
Creation date
10/12/2006 3:53:50 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8271.200
Description
Colorado River Basin Salinity Control Program - Development and History - UCRB 13a Assessment
Basin
Colorado Mainstem
Water Division
5
Date
9/1/1979
Title
Impacts on the Lower Colorado River Region Resulting from Alternative Levels of Emerging Energy Development in the Upper Colorado River Region
Water Supply Pro - Doc Type
Report/Study
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<br />~ <br />~ <br />00 <br />en <br /> <br />pointed out that all of the projected flows at the compact point <br /> <br />are well above 8.25 million acre-feet. <br /> <br />If these low flows occur for a duration of several days (2 to 3) <br /> <br />and the river elevation is reduced, there could be a loss of <br /> <br />aquatic plants and aquatic invertebrates due to dessication <br />(exposure). A dessication of organisms would result in a loss <br />of available food for the animals within the canyon and would <br />probably temporarily stunt the invertebrate and fish populations <br />in this stretch of river. The reduction should be temporary, <br /> <br />because it is based on low flow conditions expected to occur <br /> <br />twice in 23 years. <br /> <br />If the waters return to the levels considered normal for the <br /> <br />remaining 21 years, the impacts would be temporary. The spawning <br />habitat for rainbow trout could be exposed by these conditions. <br />If this occurred intermittently during the 5-week spawning period <br />(May to June), I-year class of fish could be lost. <br /> <br />The Lake Mead bass fishery has been, an item of increasing public <br /> <br />attention in the last few years and it is important to discuss it <br /> <br />in relation to energy development and depleted flows in the Upper <br /> <br /> <br />Region. The Lake Mead bass fishery is now being impacted by two <br /> <br />conditions. First, lake levels are fluctuating during the <br /> <br />spawning season causing a reduction in the number of bass reach~ <br /> <br />ing adult status. Second, there has been a reduction of the <br /> <br />25 <br />
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