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<br />. <br /> <br />. <br /> <br />This alternative would consist of the reconstruction of the <br />river components only, consisting of a 100 ft section of <br />inflatable bladder gate, 100 feet of concrete short wall and <br />a rip rapped sand dam spanning the remaining distance across <br />the river channel. The ditch intake structure would remain <br />untouched. This alternative would solve all problems <br />associated with the current operational status of the <br />diversion. Lowering the bladder gate during times of high <br />river flow will greatly reduce the "wear and tear" on the <br />entire intake system. This structure will alleviate a <br />sanding problem in the ditch and will also alleviate the <br />problem of debris hanging up on the structure. The cost of <br />this alternative is approximately $374,000. <br /> <br />4. Completely rebuild the entire intake system, river <br />diversion and ditch gates: <br /> <br />. <br /> <br />This alternative completes the provisions of alternative <br />number 3 and addresses the problem of having a ditch intake <br />structure significantly older than the river diversion. The <br />ditch components are to be rebuilt in this alternative using <br />radial gates very similar to their current design. The cost <br />of this alternative is approximately $474,000. <br /> <br />The Selected Project <br /> <br />The JLRIC plans to construct alternative #3. Features of this <br />alternative are as follows: <br /> <br />. <br /> <br />Sheet piling and pipe piling will be used under all the <br />concrete structures for general stabilization and for <br />protection from undercurrents. Pipe piling will be placed in <br />an equally spaced pattern and the sheet piling will form the <br />perimeter of these structures. <br /> <br />The bladder gate and short wall structure will have a <br />monolithic steel reinforced concrete floor. This floor will <br />be approximately 15 inches thick. <br /> <br />Wing walls and support walls will all be steel reinforced <br />concrete with a minimum thickness of 15 inches. <br /> <br />. <br /> <br />The first portion of the river structure will be 100 feet of <br />Obermeyer Pneumatic Spillway Gate or Bladder Gate. This gate <br />will be 5 feet high and will be located immediately adjacent <br />to the intake gates. <br /> <br />Feasibility Study <br />Jackson Lake Reservoir and <br />Irrigation Company Diversion Structure <br />September 1999 <br /> <br />7 <br /> <br />. <br />