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<br />°v ~ <br />Loma <br />0 <br />N ~ <br />r <br />coi <br />o,~ <br />a <br />G ~~Ve <br />c <br />J <br />O <br />to <br />L <br />O <br />U <br />N <br />W E <br />i <br />S <br />a° <br />im <br />~~ <br />V~ f <br />~~ <br />s <br />Grand Junction <br />o ea°r <br />5~1\6R Palis eGage <br />1 <br />zoo <br />177 <br />~, 2 Adjacent sites, CLIFTON, CORN LAKE <br />G <br />7~~. <br />~i~ Whitewater Gage <br />~`~^ <br />Bridgeport ~ <br />10 0 10 20 Miles <br />Figure 4. Location of the two study sites in the 15-Mile Reach, Colorado River, Corn <br />Lake and Clifton. <br />Summer flows were much less in 2000 and 2001 than in 1999. They provided an <br />opportunity to sample the fish population at different flows. Osmundson et al. (1995) <br />made instream flow recommendations for the 15-Mile Reach based on a study of habitat <br />availability for endangered fish. The recommendations from Osmundson et al (1995) <br />were somewhat complex because they wanted to avoid using a single minimum flow. <br />These instream flow recommendations were provided as mean monthly (not mean daily) <br />minimums flows. They varied by season and depending on wet, average and dry flow- <br />year categories determined from historic flow data. The lowest mean monthly flow <br />recommendation was 810 cfs (Table 1), which should only occur at the same frequency <br />as dry years, which was defined as two in ten years. In half the years, the mean monthly <br />minimum flow for August to September should exceed 1630 cfs (Table 1). <br />20 <br />