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1s 14 12 ,-. ~ 10 .~ 0 0 0 8 VT 0 6 4 2 Colorado River USGS Streamflow Gage @ Palisade Estimated Discharge that the GVIC Diversion Dam is inundated /--- 1997 -+ ~ 1998 O N D J F M A M J J A S O N D MONTH Figure 3. Mean daily streamflow (cfs) for the Upper Colorado River near Palisade, Colorado, for the water year October 1997 to December 1998. Data were obtained from the USGS gage, number 09106150 (RM 184.7), below Grand Valley Diversion, near Palisade, Colorado. Floy° tagged. A total of 5.72 hours were expended electrofishing downstream following runoff (Table 1). During the 1-year study, a total of 1,571 native and 244 nonnative fishes were either PIT tagged, floy tagged, or fin clipped (Table 1; Appendix Table B.1.). A total of 12.83 hours of electrofishing were expended downstream capturing fish to mark during both pre-runoff and post-runoff. A total of 2,505 fish was captured upstream of the diversion dam prior to spring runoff (27 April) and during post-runoff (17 July to 21 October). Ten days between 17 July and 21 October were spent electrofishing (8.77 hours; Table 1) upstream of the GVIC Diversion Dam in which a total of 2,338 fish were collected (Appendix Table C.1.). Only one fish of the 1,815 fish either marked during pre-runoff (April) or during post-runoff (July and August), was recaptured upstream of the GVIC Diversion Dam (recapture rate=0.061; Appendix Table C.1.). Thi s fish , an adul t carp F1 oy~ tagged 19 August at RM 183.5 , was recaptured approximately 300 yards upstream of the diversion dam one week later (26 August). Because there was no water spilling over the diversion dam during this one-week 9