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<br />27 <br /> <br />Table 4. Mean daily flow (cfs) and temperature (OC) for the ~reen <br />River at Greendale, Utah (0.5 MBD), 1951-1977 (U.S.G.S. <br />data) (from Holden and Crist 1979). <br /> <br /> 1951-62 1963-66 1967-77 <br />Month Flow Temp.l Flow Temp. Flow Temp. <br />Jan. 597 0.6 1497 5.0 2507 5.4 <br />Feb. 792 0.6 1641 3.2 2265 4.4 <br />Mar. 1413 2.2 1410 3.3 1692 4.3 <br />Apr. 2752 7.2 1578 3.8 1765 4.4 <br />r~ay 4462 11. 1 1009 4.6 2512 4.6 <br />June 6996 15.5 1155 5.7 2535 5.0 <br />July 3375 21.1 1178 6.9 2625 5.6 <br />Aug. 1635 20.0 1128 7.8 2748 6.6 <br />Sept. 913 15.5 1281 7.9 2327 7.6 <br />Oct. 920 10.0 1192 10.0 2294 8.3 <br />Nov. 814 1.7 1395 12.6 2501 9.0 <br />Dec. 628 0.6 1511 8.7 2832 7.9 <br /> <br />lData for 1957-59 only. <br /> <br />After 1966 the mean monthly releases from the dam nearly doubled for <br /> <br />all months except February, March, and April. Temperature of the re- <br /> <br />leased water also became colder after 1966 in June-September, although <br /> <br />only by 1-20 C. Holden and Crist (1979) hypothesized that the increasec;l <br /> <br />quantity of colder water created cooler conditions in the river below <br /> <br />the dam, thus affecting the trout fishery. <br /> <br />They also suggested that <br />, <br /> <br />