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<br />-16- <br /> <br />Summer Low Flow Test Report - April 2002 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />diminished habitat area, reduced habitat depth, higher <br />water temperatures, and water quality changes, <br /> <br />Method <br /> <br />Visual observations were made by fishery biologists using <br />rafts on approximately 3S miles of the San Juan River from <br />Navajo Dam to Salmon Ruin downstream of Bloomfield. <br />Measurements were taken at 71 sample sites of changes in <br />river stage, wetted perimeter, and average depth for pools, <br />riffles, and runs, Measurements were also taken at 77 sites <br />for water quality parameters, including water temperature, <br />dissolved oxygen, conductivity, and salinity, <br /> <br />Attachment C describes in greater detail the effects of the <br />Test on fish populations and the aquatic habitat of the <br />San Juan River below Navajo Dam. <br /> <br />Before the Test, fish shocking was conducted and about <br />l,200 trout were captured below Citizens Ditch, moved <br />upstream, and maintained for replacement purposes in the <br />event the Test resulted in significant losses downstream, <br />After the Test, NMDGF restocked the river below Citizens <br />Ditch with trout. <br /> <br />RECREATION AND ECONOMICS <br /> <br />Outcome <br /> <br />Reservoir - Negative impacts to reservoir recreation were <br />not observed during the Test. Colorado and New Mexico <br />State Parks do not anticipate long-term adverse impacts. <br />