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1722 D. B. OSMUNDSON ET AL. Ecological Applications <br />Vol. 12, No. 6 <br />RIFLE <br />El <br />RULISON <br />YDEBEQUE <br />M G <br />(rk 303) <br />V? <br />c? <br />?o <br />7 <br />DELTA <br />JL <br />'7 C <br />25 50 75 100 <br />km <br />Loke Powell <br /> 1650 <br /> 1550 <br /> <br /> 1450 <br />c <br />0 <br /> <br /> 1350 <br />W <br /> 1250 <br /> 1150 <br />0 40 80 120 160 200 240 280 320 360 400 <br />River kilometers (rk) <br />FIG. 1. Map (top) and longitudinal profile (bottom) of the upper Colorado River with numbered (1-11) study strata. <br />Downstream and upstream river-kilometer (rk) boundaries of the 11 study strata are: 1, 0-103; 2, 103-113; 3, 113-126; 4, <br />126-142; 5, 142-151; 6, 151-182; 7, 201-248; 8, 148-275; 9, 275-298; 10, 312-323; 11, 328-373. The locations of current <br />U.S. Geological Survey gauging stations are marked with crossed circles. The city of Grand Junction is abbreviated as G.J. <br />carried downstream and through the system now has a channel area has declined by 25% in the 51-km Grand <br />greater tendency to accumulate on the riverbed and Valley area (from Loma to Palisade) and 31% in the <br />channel margins. As a result, the channel (wetted area 58-km DeBeque-to-Rifle segment (Van Steeter and Pit- <br />at base flow) has narrowed and backwater and side- lick 1998, Pitlick and Cress 2000).