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Section 77g,2p (c) Continued. • These specimens were very early instars and in poor condition for identification. The stream at this location is below a small impoundment used to store crater for fugitive dust control. Flow in the stream is relatively fast at this station, but as in the case at the other Foidel Creek Stations, the channel is choked with filamentous algae and American eel grass. The channel is wider (1 to 2 feet) and steep sided with considerable shading from bank grasses and sedges. Substrate in the riffle areas was largely medium to large gravel and the pools were small gravel, coarse sand, and somewhat hard packed. Lower Fish Creek. Stream habitat characteristics at the lower Fish Creek Station are considerably different than at any of the Foidel Creek Stations. At the time of sampling discharge was considerably • greater than at lower Foidel Creek while flow velocity was medium to sluggish. The channel is rather wide (15 to 20 feet) and saucer shaped. Substrate in riffle areas ranged from medium gravel to cobble, while pool substrate was largely fine gravel to coarse sand. Very little filamentous algae growth was present and the banks contained very little aquatic macrophyte growth, thus pro- viding little shading of the bottom. Results of aquatic macroinvertebrate analyses from lower Fish Creek are presented in Table 67, Density, Percent Relative Abundance, Diversity and Equitability of Aquatic Macroinvertebrates Collected From Lower Fish Creek. The mayfly Heptagenia sp. (Ephemeroptera: Heptageniidae) was the predominant species in the Surber samples and comprised 59.6 percent of the total mean density or 17 organisms/ ft2. Another mayfly species, Tricorythodes sp, was also relatively abundant comprising 15.8 percent of the total mean density or 4.5 organisms/ft2. Midge larvae comprised about 14.1 percent of the . total mean density and consisted of at least five different species. 779-231