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<br />provide additional maintenance. These structures must not be compromised in any manner that might <br />weaken the structural or operational integrity of the dam. Failure to ensure the structural and operational <br />integrity of these structures and dams would put downstream human populations at risk. <br /> <br />In addition, frequencies of inspections and maintenance would increase under higher spillway uses. This <br />type of work often entails interruptions ohiver nows and affects river stability. Review of modeling <br />results in the table below shows changes in spill frequency at Blue Mesa, Morrow Point, and Crystal. For <br />example, Crystal spilled in 8 of the 26 years analyzed under baseline conditions, and could spill up to 20 <br />times under the now recommendation conditions. <br /> <br />Spillway Use Frequency <br />(years of 26 year study period) <br /> <br /> <br />Blue Mesa <br /> <br />,., <br />:J <br /> <br />5 <br /> <br />Morrow Point <br /> <br />. <br /> <br />,., <br />:J <br /> <br />,., <br />:J <br /> <br />Crystal <br /> <br />8 <br /> <br />20 <br /> <br />Similarly, increased bypass use can increase maintenance costs. The following table presents information <br />on bypass use frequency. <br /> <br />Bypass Use Frequency <br />(years of 26 year study period) <br /> <br /> <br />Blue Mesa <br /> <br />11 <br />6 <br /> <br />22 <br /> <br />Morrow Point <br /> <br />5 - 14 <br /> <br />Crystal <br /> <br />22 <br /> <br />26 <br /> <br />Fish and Wildlife <br /> <br />Fish and wildlife resources affected by the operation of the Aspinall Unit include the fishery in Blue <br />Mesa Reservoir, the Gold Medal trout fishery downstream from Crystal Dam, and the riparian corridor <br />along the river. A further analysis of these resources and impacts should be accomplished by the <br />Colorado Division of Wildlife. <br /> <br />10 <br />