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<br />:/' ....- ~ <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />2 <br /> <br />0.35 is recommended for the November 1 to April 30 cold weather period, <br />This flow provides an average wetted perimeter of at least 6 percent in <br />both cross sections, average velocities of at least 0.7 feet per second in <br />both cross sections, an average depth of 0.15 feet, and a maximum depth <br />ranging from 0.19 to 0.23 feet in the two cross sections. This flow should <br />provide adequate physical habitat to allow passage between pools during <br />low flow periods. <br /> <br />Relationship to Management Plans: The BLM is very interested in protecting flows stream <br />flows in Dorsey Creek because it is one of the few streams managed by BLM on the eastern side <br />of the San Luis Valley that is capable of supporting a salmonid fishery. BLM has implemented <br />efforts to improve stream conditions along this creek by changing grazing regimes and by moving <br />roads and vehicle traffic away from the creek. The stream has responded well, with a significantly <br />improved width to depth ratio. Maintaining a fishery in this very small stream channel is only <br />possible if the limited flows are fully protected. <br /> <br />The BLM requests that the Board recognize that this recommendation is based only upon the <br />minimum flows necessary to support cold-water fishery values. BLM may wish to work the <br />Board and/or through the Colorado water rights system to appropriate flows to optimally protect <br />fish values and to protect other water-dependent values specified in BLM resource management <br />plans. <br /> <br />Data sheets, R2Cross output, fishery survey information, and photographs of the cross section are <br />enclosed to support this recommendation. We would like to thank both the Division of Wildlife <br />and the Water Conservation Board for their cooperation in this effort. <br /> <br />If you have any questions regarding our instream flow recommendation, please contact Roy Smith <br />at 303-239-3940. <br /> <br />Sincerely, ~ <br />'- ~ ("" <br />~ - -?- <br /> <br />James E. May <br />Acting Deputy State Director <br />Resource Services <br /> <br />4 Enclosures <br />Data Sheets <br />R2Cross Output <br />Fishery Survey <br />Photographs <br /> <br />cc: <br /> <br />Dave Gilbert, Front Range Center <br />Tom Goodwin, Saguache Field Office <br />Jim Rhett, Monte Vista Center <br />