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0 0 <br />Spring complex in <br />SE /4 SE /4, Section <br />Confluence with <br />17.7 <br />10% <br />90% <br />Arkansas River <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 B). <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. Appendix B 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 now <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 />and runs will also be maintained for most life stages of fish and aquatic invertebrates (Nehring <br />1979; Espegren 1996). <br />For this segment of stream, three data sets were collected with the results shown in Table 1 <br />below. Table 1 shows who collected the data (Party), the date the data was collected (Date), the <br />measured discharge at the time of the survey (Q), the accuracy range of the predicted flows <br />based on Manning's Equation (240% and 40% of Q), the summer flow recommendation based <br />on meeting 3 of 3 hydraulic criteria and the winter flow recommendation based upon 2 of 3 <br />hydraulic criteria. <br />-3- <br />