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Evaluation of Diversion Structures <br /> <br />navigate and the area of local habitat disturbance is relatively large. Because of its location ' <br />adjacent to Highway 40, it also generates a fair amount of public comment and criticism. As <br />with the Deep Cut Ditch, a comprehensive monitoring effort through an entire migration cycle ' <br />is probably warranted at this structure to determine its passage characteristics and, more <br />importantly, whether the endangered fishes are found this far upstream. <br />Other Upstream Diversions <br />n <br />J <br />The Shelton, Williams, Walker, and Marshall-Roberts diversions all exhibited moderate ' <br />combinations of habitat disturbance and passage obstruction. While these structures are located <br />well above designated critical habitat, the adverse characteristics they exhibit could probably be <br />mitigated without resorting to unusual construction techniques. Depending on the outcomes of , <br />performance monitoring at the Deep Cut and Cary Ditch diversions, some improvements in the <br />annual maintenance procedures at these diversions may be justified. <br /> <br /> <br /> <br /> <br />1 <br />11 <br /> <br /> <br /> <br /> <br /> <br /> <br />3-10 1