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Instream Flow Recommendation(s) <br />BLM recommended an enlargement of 2.50 cfs during the summer, based on its August 23, 2005 <br />and August 14, 2004 data collection efforts (see Appendix). The modeling results from this <br />survey effort are within the confidence interval produced by the R2Cross model. <br />Land Status Review <br />Upper Terminus <br />Lower Terminus <br />Total Length <br />(miles) <br />Land Ownershi <br />% Private <br />% Public <br />Spring complex in <br />Confluence with <br />SE /4 SE /4, Section <br />Arkansas River <br />17.7 <br />10% <br />90% <br />13, T51N R10E <br />The 90% public land ownership is comprised of USFS (52 %), BLM (26 %), and State (12 %). <br />Biological Data <br />The BLM has conducted field surveys of the fishery resources on this stream and have found a <br />natural environment that can be preserved. As reported in the letter from BLM to the CWCB <br />"Badger Creek is a moderate gradient stream with small substrate size that occasionally <br />experiences very large flood events. The stream supports riparian communities consisting of <br />cottonwood/coyote willow, willow /alder, and mesic grasses." Fishery surveys indicate that the <br />stream environment is presently in stable condition, and supports a self - sustaining brown trout <br />fishery. Channel stability, bank stability, food supplies, and water quality are good for <br />salmonids. However, the fishery is limited by a high silt load and occasional high stream <br />temperatures. Accordingly, it is important to provide streamflows that keep stream temperatures <br />low and that flush sediments from the system." (See Fish Survey in Appendix). <br />Field Survey Data <br />BLM staff used the R2Cross methodology to quantify the amount of water required to preserve <br />the natural environment to a reasonable degree. The R2Cross method requires that stream <br />discharge and channel profile data be collected in a riffle stream habitat type. Riffles are most <br />easily visualized as the stream habitat types that would dry up first should streamflow cease. <br />This type of hydraulic data collection consists of setting up a transect, surveying the stream <br />channel geometry, and measuring the stream discharge. The appendix contains copies of field <br />data collected for this proposed segment. <br />Biological Flow Recommendation <br />The CWCB staff relied upon the biological expertise of the cooperating agencies to interpret <br />output from the R2Cross data collected to develop the initial, biologic instream flow <br />recommendation. This initial recommendation is designed to address the unique biologic <br />requirements of each stream without regard to water availability. Three instream flow hydraulic <br />parameters, average depth, percent wetted perimeter, and average velocity are used to develop <br />biologic instream flow recommendations. The CDOW has determined that by maintaining these <br />three hydraulic parameters at adequate levels across riffle habitat types, aquatic habitat in pools <br />