Laserfiche WebLink
03/13/96 15:09 $303 245 6933 FISH & WILDLIFE -a,-- R 0 a Denver Q011/011 <br />3, obtain empirical water depth profiles across various transects during <br />low-flow periods identified by the hydrological model as having <br />critical water depths for passage of sub-adult and adult Colorado <br />squawfish, anc <br />6. recommend a minimum flow for passage of Colorado squawfish and <br />razorback sucker in the reach. <br />Provisional minimum flows for providing passage sub-adult and adult <br />Colorado squawfish during low-flow periods in this reach were developed from 1) <br />direct observations and empirical biological data and 2) predicted and empirical <br />hydrologic data. 'Minimum' flows recommended in this study are defined as those <br />flows necessary for adequately providing passage for sub-adult and adult Colorado <br />squawfish in the 2.3-mile reach, but not necessarily those that promote an <br />increase in population size. Some define minimum flows as 'protection flows'. <br />With the fish passage at Redlands operational, it is imperative that minimum <br />flows for passing Colorado squawfish and razorback sucker be identified in this <br />reach to allow unimpeded up- and downstream movement of fishes between the <br />passage facility and confluence with the Colorado River. <br />This report does not recommend flows necessary for the enhancement or <br />maintenance of flows necessary for the various life stages of endangered fishes <br />in the 2.3-mile reach. Very little information is available for razorback sucker <br />use in the 2.3-mile reach. For this reason, the minimum flow recommendations in <br />this report are regarded primarily for sub-adult and adult Colorado squawfish. <br />4