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BRUSH CREEK <br /> When monitored in March, 1989, the aquatic macroinvertebrate <br /> community had good diversity among cleanwater taxa, which indicated there <br /> was good water quality and good instream substrate in the reach sampled. <br /> Cleanwater taxa included a strong resident population of the mayfly <br /> Rggggt,}g, other mayflies R saga.& and Rye er, ;a "ji, with a fair <br /> population number, stoneflies Pgdigget& and members of the family <br /> Leuctridae, and a caddisfly, There were warning numbers of <br /> those taxa tolerant to sedimentation; however, sediment and organic <br /> nutrients did not appear to be a problem in this ecosystem. The observed <br /> number of shredders in the community is generally found where riparian <br /> habitat is in fairly good condition. The diversity and resident population <br /> numbers for many of the taxa indicated that there was good stability in <br /> this ecosystem. <br /> The potential for a resident fishery on this stream appeared to be <br /> good. Cleanwater taxa present indicated there would be suitable spawning <br /> substrate available, and the macro invertebrate biomass of 2.4 g/m2 could <br /> provide nutrients for a good fishery and was about what one would expect <br /> in a stream with 71 mg/l alkalinity. <br /> The BCI value of 100 indicated that this ecosystem was matching its <br /> potential, and it appeared that a management option may be to simply <br /> maintain existing good conditions in this aquatic ecosystem. These data <br /> will provide an excellent basis for evaluating effects of the proposed ski <br /> area. <br /> 3 <br />