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<br />the .large" of Big Island backwater, designated BA 333.2. These two <br />backwaters and the main river at about RMI 332.2 were sampled in 1987. In <br />1988, the BA 332.2 did not form, and was replaced with Rainbow Park, BA 327.6. <br /> <br />At Jensen, the designated reference backwater BA 300.26, persisted throughout <br />the 1987 study period. A small, ephemeral backwater, BA 300.27 was located a <br />short distance upstream from the reference backwater. This shallow, broad, <br />backwater became intermittently isolated from the main river flows for short <br />periods of time later in the season at low river flows. The main river was <br />sampled at RMI 300.26. We sampled a backwater downstream at RMI 298.6, about <br />200 m upstream from the confluence with Squaw Creek, named BA 298.6 or Squaw <br />Creek. <br /> <br />Among Jensen backwaters, only Squaw Creek formed in 1988, but it eventually <br />dried up, so new backwaters were selected. An "ephemeral" backwater <br />(BA 300.6), a long, narrow and deep backwater (BA 300.5, Pumps), a mid-season <br />substitute for dried up Squaw Creek (BA 299.2, Deer Track) and a small <br />backwater below an intermittent tributary (BA 298.4, Below Squaw Creek) were <br />selected in 1988. <br /> <br />At Ouray, the reference backwater also dried up as riverflows decreased, but <br />another smaller backwater formed at that site. This near-reference backwater <br />(BA 251.0) persisted throughout both sampling seasons. The main river was <br />sampled at RMI 251.0. A broad, shallow backwater at RMI 250.8 was designated <br />Moult Bend (BA 250.8). Further downstream about 200 m upstream from the <br />confluence with Old Charley Wash at RMI 249.7 was another backwater we <br />selected for sampling. Old Charley Wash backwater (BA 249.7) in 1987 was <br /> <br />13 <br />