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river. One Colorado River squavtish about 4 inches lona was also taken ina shallov arm of the Yampa alons with several small carp about two or three inches long. One of the carp had a very definite and pronounced hump on its back. August 16, 1962 River dropped i inch since last observat ion. Time: 4:30 p.m. - Yampa River. pH, 7.5. D.0:1 8.1 p.p.m. Hater temperature" 730.,. phth., B p.p.m. M.O." 1,3&1- p.p.m. Weather, clear, windy. Air temperature" 9(;0.,. River dropped i inch since last observation. Time: 4:55 p.m. - Green River. pH" 7.5. D.O., 7.7. p.p.m. tlater temperature, 690.,. phth." 8 p.p.m. M.O., 136 p.p.m. Weather, windy, clear. Air temperature, 9(PF. Caught one channel catfish in a gUl net in slow-moving water in Yampa River. Fish was about 18 inches long and was taken at nipt. August 19, 1962 I obser'\"ed many small gray mayflies flying lov over the ~ampa River. This 1s the first time that I have seen them, so they must have emerged just recently. August 20, 196a River dropped 1 inch since last recording. Time: 4:50 p.m. Yampa River. pH.. 1.5. D.O., 6 p.p.m. Water temperature, 140F. phth... 1 p.p.~. M.O." 137 p.p.m. Weather, clear, calm. Air temperature, 85 F. River dropped 1; inches since last observation. Time: 5:10 p.m.o- Green River. PH" 7.5. D.O. 6.8 p.p.m. Water temperature, 70 F. phth., 0 p.p.m. M.O., 148 p.p.m. "leather, calm, clear. Air temperature '8~F. The river turned a deep red color over night. Caught one channel catfish on a tbrol1line in the Green River close to where the Yampa enters it. The fish was about 15 inches lons. August 21" 1962 River was more turbid this morning than it was yesterday, and is still a deep red color. . River level stayed the same since last observation. Time: 5:00 p.m. 0- Green River. pH, 7.5. D.O: l 6.8p.p.m. Hater temperature, 68.5 F. phth." 6 p.p.m. M.O., l~ p.p.m. "leather, cloudy, windy. Air temperature, 760F. August 22, 1962 River lost its red color and began to clear up. water level s'tayed about the same since 1&8't observation. Caught two channel catfish on throwlines in the Green River. One fish weighed 837.0 gms., length was 18.6 in. I preserved only the insides and pectoral and dorsal spines. -22- ,;