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P <br />STUDY AREA AND SITE SELECTION <br />Study Area <br />Much of the study area was located within the boundaries of <br />9 <br />Dinosaur National Monument in northwestern Colorado and northeastern <br />Utah (Figure 1). Sampling was done at sites on the Green River <br />from Flaming Gorge Dam to Split Mountain Gorge near Jensen, Utah, <br />136 km below the dam, and on the Yampa River from its confluence <br />with the Green River eastward 89 km. The region through which these <br />P rivers flow is classified as semi-arid with a mean annual rainfall <br />of 305 mm. The area is part of the eastern end of the Uintah <br />Mountain Range and is characterized by rolling hills with deeply <br />/ incised canyons. <br />Yampa River <br />Using the stream classification system where small headwater <br />streams with no tributaries are designated first order streams, <br />the joining of the two first order streams forms a second order <br />stream, and so forth, the Yampa River at its mouth is technically <br />classified a fifth order stream. Where it joins with the Little <br />Snake River just east of the Monument boundary it is a fourth <br />0 order stream. <br />From its origin high on the west slope of the Rocky :fountains <br />near Steamboat Springs, Colorado, the Yampa River flows through a <br />broad basin with rolling hills to the boundary of Dinosaur National <br />16