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<br />Instream Flow Recommendation(s) <br /> <br />y 1 BLM's flow recommendation is for 1.7 cfs eApril1- June 30). 0.4 cfs eJuly 1 to July 31) <br />& 0.3 cfs eAugust 1 - March 31). esee BLM letter in Appendix A) <br /> <br />e Land Status Review <br /> <br /> Total Length Land Ownership <br />Upper Terminus Lower Terminus emiles) % Private % Public <br />Unnamed Tributarv Golden Castle Gulch l.l 0% 100% <br /> <br />This segment is located on 100% public land managed by the BLM eSee attached Figure 1). <br /> <br />Biological Data <br /> <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 for this reach of stream in their <br />September 24, 1999, letter to the CWCB and enclosed fishery surveys esee Fishery Surveys in <br />Appendix B), "Fishery Surveys indicate that the stream environment is in stable condition and <br />supports both Colorado River cutthroat trout and brook trout. From historic data it appears that <br />the brook trout population is out competing the native trout population. Water temperatures and <br />food availability are good for salmonids but pool habitat and spawning substrate are limiting <br />factors. The lack of pool habitat and spawning substrate underscore the importance of sufficient <br />water for maintaining the limited physical habitat." <br /> <br />e <br /> <br />Field Survey Data <br /> <br />BLM and CWCB staff used the R2CROSS methodology to quantify the amount of water <br />required to preserve the natural environment to a reasonable degree. The R2CROSS method <br />requires that stream discharge and channel profile data be collected in a riffle stream habitat- <br />type. Riffles are most easily visualized, as the stream habitat types that would dry up first should <br />the streamflow cease. This type of hydraulic data collection consists of setting up a transect, <br />surveying the stream channel geometry and measuring the stream discharge. Appendix B <br />contains copies of the field data collected in regards to this proposed segment. <br /> <br />Biological Flow Recommendations <br /> <br />The CWCB staff relied upon the biological expertise of the cooperating agencies to interpret the <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 in stream 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 eNehring <br />1979; Espegren 1996). <br /> <br />e <br /> <br />For this segment of stream, one data set was collected with the results shown in Table I below. <br />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 predicted flows based on <br />Manning's Equation (240% and 40% of Q), the summer flow recommendation based upon <br />meeting 3 of 3 hydraulic criteria and the winter flow recommendation based upon 2 of 3 <br />hydraulic criteria. <br />