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<br />1989 and an aerial photograph of the same area during 1988, respectively. Flows at the Jensen
<br />gauge were similar for both dates although slightly higher in 1988. These figures illustrate how
<br />sandbar configuration may change from year to year as well as presenting a good example of the
<br />more numerous, smaller backwaters of 1988 compared to fewer, larger backwaters during 1989. The
<br />difference in flows may account for the disparity shown; however, the 1988 photograph shows larger
<br />sandbars at a higher flow. If the sandbar configuration were the same, smaller sandbars would be
<br />expected at higher flows, as opposed to the larger sandbars seen in figure 2.
<br />
<br />Comparison of the upper and lower reaches of the Green River from previous studies have shown
<br />similar trends, with fewer and smaller backwaters occurring in the lower reaches of the Green River
<br />than in the upper reaches (Pucherelli et al., 1988; Pucherelli and Clark, 1989). Backwater area/mile
<br />in the lower reach averaged only 570 m2 in 1989, while the upper reach averaged 2,501 m2/mile.
<br />Similarly, in 1988, backwater area/mile in the lower reach averaged only 508 m2 while the upper
<br />reach averaged 2,150 m2/mile.
<br />
<br />Correlation of Video Monitoring and Catch Data
<br />
<br />An objective of this study was to correlate the river habitat data with the CPUE data collected by
<br />the participating agencies. Valuable information will be compiled to assist managers and
<br />researchers in facilitation the recovery of the endangered fish in the upper Colorado River Basin.
<br />Although several years of data will be required to determine if habitat information correlates well
<br />with fish sampling data, we believe that correlation of the 1989 habitat and CPUE data will be
<br />useful in refining techniques related to the ongoing ISMP.
<br />
<br />BIBLIOGRAPHY
<br />
<br />Evans, L., and B. Belknap, N.D., Dinosaur river guide, Westwater Books, 1985.
<br />
<br />Pucherelli, M. J., J. N. Halls, and R. C. Clark, "Green River channel mapping study," Bureau of
<br />Reclamation Applied Sciences Referral Memorandum No. AP-88-4-1, 1987.
<br />
<br />Pucherelli, M. J., R. C. Clark, and J. N. Halls, "Green River backwater habitat mapping study, 1987
<br />interim report," Bureau of Reclamation Applied Sciences Referral Memorandum No. AP. 88-4-4,
<br />1988.
<br />
<br />Pucherelli, M. J., R. C. Clark, and J. N. Halls, "Green River channel morphology study using four
<br />dates of aerial photography, near Green River, Utah," Bureau of Reclamation Applied Sciences
<br />Referral Memorandum No. AP-88-4-7, 1989a.
<br />
<br />Pucherelli, M. J., R. C. Clark, J. N. Halls, S. Wilds, and R. D. Williams, "A pilot study to evaluate
<br />backwater habitat on the Green River using aerial photography and GIS," U.S. Corps of Engineers
<br />Sixth Remote Sensing Symposium, 1989b.
<br />
<br />Pucherelli, M. J., and R. C. Clark, "Comprehensive report (1986 - 1989) on the effects of Green
<br />River flows on backwater habitat availability as determined by remote sensing techniques," Bureau
<br />of Reclamation Applied Sciences Referral Memorandum No. Ap. 89-4-5b, 1989.
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