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MODDE AND IRVING <br />319 <br />Flaming <br />Gorge <br />Reservoir Wyoming <br />Utah Colorado <br />-- <br />Ve: al 1 J !Dinosaur <br />National <br />Ashely Creek _ _ -~' ,i ~ Monument Yampa River <br />4 <br />~ 6 <br />Duchesne River • White River <br />Rangely <br />Green River <br />80 Kilometers ~ <br />50 Miles <br />N <br />Location Area River Kilometer <br />Yampa River spawning site 555 <br />Island Park 531-538 <br />Split Mountain Canyon 513-526 <br />Escalante spawning area 492-501 <br />Stewart Lake 480 <br />Ouray National Wildlife Refuge 401-501 <br />Mouth of the Duchesne River 399 <br />wr <br />UT <br />co <br />Study Area <br />FIGURE 1.-Map of the middle Green River showing the razorback sucker movement study area. River kilometers <br />(RK) are from the confluence of the Green and Colorado rivers. <br />addition, capture records of fish over a 15-year <br />period were used to describe general movement <br />patterns. Fidelity to spawning sites was determined <br />by both telemetry and recapture data. <br />Study Area <br />The study area included the Green River be- <br />tween the mouth of the White River (river kilo- <br />meter [RK] 391, from the confluence of the Green <br />and Colorado rivers) upstream to the confluence <br />of the Green and Yampa rivers (RK 555) (Figure <br />1). This reach includes the upstream portion of the <br />longest low-gradient (0.1%) section of the Green <br />River downstream of Flaming Gorge Dam. As- <br />sociated with this low-gradient reach is the largest <br />area of floodplain habitat in the Green River basin <br />occupied by endangered fishes (Irving and Burdick <br />1995). Spring high flows in the middle Green River <br />are determined by the relatively free-flowing Yam- <br />pa River and the summer base flows from reservoir <br />discharges from Flaming Gorge Dam (Tyus and <br />Karp 1989). In addition to the physical changes in <br />