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Section 778,20 (c) Continued. • organisms adapted to burrowing in the silt or silty sand such as tubificid worms and midge larvae. Simulid (blackfly) larvae were important in the Surber samples (riffle areas) of middle and lower Foidel Creek. Blackfly larvae require rapid blowing, well oxygenated water, and generally .large surfaces (large cobbles and boulders) for attachment. Suitable substrate for mayflies which are generally considered indicators of good water quality, was present only in lower Fish Creek. The dominant mayflies collected in lower Fish Creek, namely, siphlonurids, and heptageniids are swimmers and clingers requiring moderate flow and a gravelly-cobble substrate. siphlonurids and heptaginiids are generally facultatively tolerant to intolerant of pollution, EPA (1973). Diversity indices *.aere the greatest at the middle Fcidel Creek • Station. For the Surber samples the diversity (d) was 2.84 while the Ekman samples had a diversity index of 3.0$. Equitabiliry (evenness of species distribution) was also relatively high or 72.9 percent and 79.0 percent for Surber and Ekman samplers, respectively. These diversity indices compare favorably with those found in the 1975 baseline study stations of upper Trout Creek and upper Fish Creek Stations were not sampled in 1979. The flow, substrate and the amount of riffle area seemed most optimum at this station, thus allowing a greater variety of organisms to inhabit this reach of Foidel Creek. Fish. 1972 Investigations. In the course of fisheries investigations the CDOW reported that Fish Creek contained 50 percent brook trout and 50 percent cutthroat trout. The strear. fisheries value rating was considered poor. Middle Creek was reported to contain the same species composition and was likewise rated poor. Foidel Creek was classified as a non-fisheries stream. C~ 779-234