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i9 <br />the ?1964 data-indicated that the river environment between Split Mountain <br />campground (89.5 MBD) and Ouray (166.0 MBD) was so different from other <br />parts of the study area (largely due to differences in gradient) that <br />comparisons between itand=upstream areas would be meaningless. Conseq- <br />uently, in 1965 the stations below Split Mountain campground were dis- <br />continued and sampling effort was increased in areas closer to the dam. <br />The major stations in -1965 'were' Little Hole (7.2 MBD), Carr Ranch (42. <br />MBD), Echo Park (65.8 MBD), and Island Park (78.0 MBD). <br />Eleven supplementary stations were sampled at irregular intervals <br />- - -to establish' species distributctt' with greater accuracy. All samples <br />were collected between June 1, 1964 and September 20, 1965. During <br />the summer of 1964 Echo and Island Parks were visited once every 2 weeks. <br />Carr" Ranch and- Ouray 'Ve`.L,6-sam1p1ed' every 3-1/2 weeks. Weekend samp i,ng <br />trips to Island Park were made in October and November, 1964, and in <br />January, February, March, and April, 1965. Samples were taken every 3 <br />weeks at Lit`tle Hole;" Carr" Ranch,- Echo Park, and Island Park during the <br />1965 field season (May 16 to September 20). <br />9