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-20- <br />Vegetation on the surrounding hillsides is predominately sagebrush. <br />Streamside vegetation is dominated by sandbar willow, with scattered stands <br />of cottonwood trees present in the immediate vicinity of the stream. <br />Attached algae found in this area was Cladophora sp.; some filamentous, <br />Spiragyra, was taken during early summer months. <br />The sampling site was a shallow area of the stream. The bottom type <br />was gravel from 1 to 3 inches across. This gravel was interspersed with <br />silt which formed a very compact bottom. <br />',~ ,.~. <br />~~ b . _. <br />r- <br />~~.~,_ <br />~ „~ `,: <br />~.w-. -~-.; "~w ..., <br />,°- x T <br />+ - _ • <br />:~ <br />Station No. 5 <br />Looking Upstream <br />. <\? <br />- ~ k.'M <br />Diatom growth at this station was much reduced as compared to previous <br />stations. Dominant forms were Cocconeis, Tabellaria and Gomphonema. <br />Navicula and Gyrosigma were present in reduced numbers. <br />Zooplankton populations averaged 1.6 organisms per liter. The organisms <br />found were rotifers and ostracods. <br />Bottom fauna at this station was restricted to Diptera, Epktemeroptera, <br />Annelida and Gastrapods. This assemblage is characteristic of water re- <br />ceiving organic wastes. The bottom fauna samples collected in this area <br />are listed on Table V, page 29. <br />Coliform counts at this station were high. Of two plate counts made <br />in November, 1958, one plate developed 115 colonies per cc., and the other <br />134 per cc. <br />