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<br />C,) <br />c) <br />~ 6000 <br />CD <br />~', <br />0 <br /> 5500 <br /> <br />5000 <br /> <br /> <br />I San Juan Rive~ <br /> <br />Navajo Dam <br /> <br />Yampa River <br /> <br />4500 <br /> <br />.ouraYI"YT <br /> <br />4000 <br /> <br />Green River, UT <br /> <br />3500 <br /> <br />Glen Canyon <br /> <br />3000 <br /> <br />o <br /> <br />50 <br /> <br />100 <br /> <br />150 <br /> <br />200 250 <br />River Mile <br /> <br />300 <br /> <br />350 <br /> <br />400 <br /> <br />River Gradient <br /> <br />Figure 3.16. River gradient comparison of the San Juan, Green, Yampa, and Colorado <br />rivers and Glen Canyon (Source: Holden 1999). <br /> <br />about 40 miles downstream. It is assumed that these larvae came from the Yampa River spawning area, <br />which is about 20 miles up the Yampa River, resulting in a total drift of about 20 to 60 miles. <br /> <br />Colorado pikeminnow YOY were seldom found in this same portion of the Green River during <br />recent studies (Holden and Crist 1981, Bestgen et aI. 1998, Trammell et al. 1999); most were found <br />well downstream. Vanicek and Kramer (I969) studied the Green River shortly after Flaming Gorge <br />Dam was completed. Green River flows at the mouth of the Yampa River during that period <br />were relatively low, because of dam filling, and warm, as a result of warming the low flows in the <br />intervening 40 miles of river to the mouth of the Yampa River. Around 1968, the flows below the <br /> <br />September 2000 <br /> <br />3-38 <br /> <br />Program Evaluation Report <br />