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15 <br />The Yampa River site was located in Echo Park, near the confluence of the Green <br />and Yampa Rivers. The downstream-most boundary of the site was approximately 200 m <br />downstream from the Yampa-Green confluence; the site extended up the Yampa River <br /> <br /> j. - <br /> <br /> <br /> <br /> <br /> r <br /> <br /> <br /> <br />4 - <br /> <br /> - <br />= 10 _ <br /> <br /> <br /> <br /> 16 <br /> ' <br /> <br /> <br /> <br /> <br />A <br />{ ? <br />ham - 2 <br />" <br />j' ?T <br />T ? <br /> ?~r <br /> <br />0 75 150 300 450 600 <br />but" <br />Figure 2. Orthorectified image mosaic of the Green River study area showing transect <br />locations (numbered) and location of the permanent benchmark (NRPP2). Photographs <br />were taken in October 1999 during base flow (73.5 rnN). Razorback sucker observations <br />were concentrated near transects five and seven. River flow is from right to left. <br />for 990 m above the confluence. The study site also included a 350 m section of the <br />Green River above the confluence, and incorporated a high-flow cutoff channel <br />connecting the two rivers at a point on the Yampa River approximately 220 m upstream <br />from the confluence (Figure 3). The Yampa River site had many features in common <br />with the Green River site, including a large sand bar that split the flow into amain