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<br />) <br /> <br />the shallow-water areas immediately downstream of the diversion dam <br />during low flows. <br /> <br />The second method will incorporate radiotelemetry to follow movements <br />of sub-adult and adult Colorado squawfish captured in the 15-mile reach <br />and implanted with LOTEK@ radio transmitters. A land-based tracking <br />station and data logger that constantly monitors and records radio <br />signals from tagged fish in the immediate vicinity will be deployed <br />near the GVrC Diversion Dam. The data logger will provide continuous <br />information on the movement of fish immediately downstream and <br />immediately upstream of the diversion dam. Therefore. this technology <br />will allow researchers to determine when a radiotagged Colorado <br />squawfish passed either up- or downstream past the diversion dam. This <br />automated tracking system is currently being used to evaluate use of <br />the fish passageway by radiotagged. adult Colorado squawfish at the <br />Redlands Diversion Dam on the Gunnison River. Movements of fish will <br />also be monitored by boat, between Price Stubb and Gvrc diversions and <br />downstream from GVrC to the Loma boat landing. rf radiotagged fish <br />cannot be located, searches may extend into the 2.3 miles of the Lower <br />Gunnison River upstream to the Redlands Diversion Dam. downstream from <br />the Loma boat landing to Westwater Wash. Utah. (river mile 124.8), the <br />.head of Westwater Canyon. and along the GVrC canal system. <br /> <br />I . Similar techniques were used to evaluate up- and downstream fish <br />movement following the construction of a grade-control structure by the <br />City of Craig. Colorado, on the Yampa River (Masslich 1993). However. <br />the study design proposed for GVrC varies slightly from the one used at <br />the Craig grade-control structure. <br /> <br />A more direct but less preferable means of determining if fish move <br />over the GVrC Diversion Dam would be to have an observer on-site to <br />record upstream movement through the notch. However. this method would <br />be impractical because it would be time consuming and would require <br />extensive observation to note if fish were moving through the notch. <br />Moreover, given that the water clarity is often poor. it would also be <br />difficult to determine what species were moving through the notch. <br />Direct observation might be used on a limited basis if the other <br />planned evaluation techniques are not successful. <br /> <br />Sufficient preliminary data may be obtained during the first year of <br />this evaluation to determine if this passageway design would be <br />appropriate to pass native fish at other instream barriers in the Upper <br />Colorado River Basin, e. g., Tusher Wash on the Green River and <br />Hartland Diversion Dam on the Gunnison River. rf the first year's <br />preliminary data from GVrC indicate that this design successfully <br /> <br />Gvrc 7 <br />