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<br />Temperatures measured ,during the sampling period ranged from 32-590 F. <br /> <br /> <br />Most stations sampled duri,ng December, 1973 to February, 1974 had 'temperatures <br /> <br /> <br />of 320 F. The high temperatures of 590 F were recorded at stations in and <br /> <br /> <br />around De Beque on september 26, 1973. <br /> <br />To further explore the possibility of s,ignificant variation in D.O. <br /> <br />fluctuations in this stretch of the Colorado River, a dissolved oxygen study <br />was conducted during september of 1974, Appendix C. Results of the two sample <br />series were similar. No D.O. levels of less than 6 ppm were encountered. <br /> <br />Upstream from De Beque, D.O. fl uctua tions of grea ter than 1.0 ppm existed in <br /> <br />a twenty-four hour period at all s,tations. From the Cameo Power Plant downstream, <br /> <br />all twenty-four hour D.O. fluctuations were less than or equal to 0.6 ppm. The <br /> <br /> <br />possibility exists that the reaeration and photosynthetic rates for these two <br /> <br /> <br />segments of the Colorado River are quite different. <br /> <br />-10- <br />