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passage could help to reduce this limiting effect by providing access to needed <br />habitats. However, if spawning habitat or habitat for adults is not limiting but rather the <br />negative interactions with introduced fishes are the dominant limiting factor, the <br />provision of fish passage may not significantly benefit Colorado squawfish recovery. <br />The third important area of information need involves understanding the problems <br />that might occur if Colorado squawfish use a fish passageway. For example, <br />squawfish that use a passageway to move around a dam and enter the reservoir <br />upstream might be unable or unwilling to return to downstream areas. Such fish might <br />no longer be part of the reproducing population, an undesirable result of providing fish <br />passage. Problems such as these would adversely affect the recovery value of a fish <br />passageway. <br />CANDIDATE SITES FOR FISH PASSAGEWAYS <br />Redlands Diversion Dam <br />In the upper Colorado River basin, development of a fish passageway was first <br />proposed in 1982 to allow movement of Colorado squawfish around the Redlands <br />Diversion, a medium-head (12-ft high) dam on the Gunnison River near Grand <br />Junction, Colorado (Figure 1). Constructed in the early 1900's, the Redlands <br />Diversion is an effective barrier to the upstream movement of fishes. The Service <br />believed that construction of a fish passageway at the Redlands Diversion would <br />provide Colorado squawfish access to historic range in the lower 40 miles of the <br />Gunnison River, a river reach now inhabited by a small number of adult Colorado <br />squawfish and razorback sucker Xyrauchen texanus. Although the Redlands Water <br />9