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<br />FLUCTUATING FLOWS AND BACKWATER HABITATS
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<br />l::::. Backwater locatioo
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<br />Figure 1. Locations of backwaters 1 through 6 on the Green River, Utah, Also indicated is the location of the study area relative to Flaming
<br />Gorge Dam
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<br />habitats by juvenile Colorado pikeminnow, This river reach is considered the most important reach for the recovery
<br />of this species in the Colorado River Basin (Muth et ai" 2000).
<br />Topographic and temperature data were collected for all six backwaters (Figure 1; see also Table I for backwater
<br />descriptions) from August to October 2003, Topographic (including bathymetric) surveys were conducted at each
<br />of the backwaters using standard surveying techniques. Elevation contours developed from the surveys were used to
<br />estimate bed elevation in each cell on a 1_m2 grid for each backwater. Sandy substrates predominated in all six
<br />backwaters. None of the backwaters supported any substantial plant growth, and vegetation on shorelines
<br />immediately adjacent to the backwaters was sparse or non-existent.
<br />Temperature recorders (Optic Stowaway, Onset Corp.) were centrally placed within each backwater and in the
<br />mainstem directly adjacent to the mouth of each backwater by attaching them to metal stakes Witil the recorders
<br />located approximately 0.2 ill above the substrate, Temperature data (:l::O,10C) were recorded hourly from 22 August
<br />to 26 October 2003 and subsequently used to calibrate tile water temperature model (see below), Additional
<br />mainstem water temperature information was collected from the U.S, Geological Survey gauge on the Green River
<br />near Jensen, Utah (No. 09261000), located approximately 90 km upstream of the study area. Hourly weather (air
<br />temperature, wind speed, relative humidity and cloud cover) during the study period was obtained from the Grand
<br />Junction. Colorado, weather station (World Meteorological Organization Identification No. 72476), located about
<br />150km southeast of the study area.
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<br />Copylight ((, 2006 John Wiley & Sons, Ud,
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<br />River Res, A.pplic. 22: 1125-1142 (2006)
<br />DOl: 1O,1002lrra
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