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-27- <br />Although most of the tributaries are small, intermittent streams, two large <br />streams, the Escalante and San Juan Rivers, empty into the river in the Glen Canyon <br />area. The Escalante River is a shallow stream with a sand and gravel bottom, fairly <br />clear nearer its headwaters, but becoming extremely turbid near its mouth. The <br />largest tributary stream in the area is the San Juan River, which is sandy bottomed <br />and quite similar in some respects to the Colorado River, but which appears to have <br />a lower productivity. <br />Chemical analysis of waters of the tributary streams indicated no unusual <br />characteristics or conditions which would be deleterious to fish. Dissolved <br />oxygen (D.O.) concentration was sufficiently high in all areas sampled to support <br />fish In those streams, in which twenty-four hour "runs" were conducted, the <br />diurnal variation was slight. Fall and winter samples show a higher D.O. concen- <br />tration. Carbon dioxide (C02) was rarely present and never exceeded 3Ppm. The <br />paucity of limestone formations in the area may account for this. Bicarbonate <br />(HCO -)- concentrations varied from 80 ppm in the San Juan River up to 260 ppm in <br />Tica~oo Canyon. <br />A twenty-four hour "run" conducted at Warm Spring Creek on July 9 and 10, <br />1958, showed a buildup of carbonates (C03=) during the afternoon, from 0 to <br />12 ppm. This indicates that sufficient green plants are present to carry on a <br />fairly high rate of photosynthesis. This appears to hold true for most of the <br />tributary streams where higher C03= concentrations were unusually encountered <br />during the afternoon. <br />Carbonate concentrations varied from 0 to 28 ppm, while pH readings of <br />from 7.2 to 9.0 were encountered. With the exception of the increased D. 0. <br />during the winter, there appears to be little seasonal change in the water <br />chemistry. <br />