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UI. RECOMMENDATIONS. <br />A. Summary of Alternates. <br />1. General Information. <br />All of the five alternates have minimal construction <br />impacts on RWPC. Flow to the power canal will not be disrupted during <br />construction of any of the alternates. Therefore, RWPC will not suffer <br />any lost capability for power generation or lost irrigation flows. <br />2. Alternate No. 1. <br />This fish ladder is located adjacent to the existing sluice <br />gates on the left bank. This option includes a fish trap, auxiliary <br />attraction water supply, bar screen at the headgates, and a trash shear <br />boom. Its entrances are located in advantageous locations for fish <br />attraction in the main river channel. Also, the original flood capacity <br />of the spillway is only reduced by 2,000 cfs. The total design and <br />construction costs of this alternate are $839,200. <br />3. Alternate No. lA. <br />This fish ladder is sited in the same location as Alternate <br />No. 1 and also has favorable entrance locations for fish attraction. The <br />capacity of the spillway is reduced by 5,500 cfs because the ladder blocks <br />a larger portion of the spillway than Alternate No. 1. The total design <br />and construction costs of this alternate are $782,900. These costs are <br />lower than for Alternate No. 1 due to fewer mechanical items required by <br />the Alternate No. lA configuration. <br />4. Alternate No. 2. <br />This fish ladder is sited in the same location as Alternate <br />No. 1 and is a low initial cost experiment that has little impact on the <br />existing dam structure. This option includes a fish trap, water supply, <br />auxiliary attraction water supply, and bar screen at the headgates. The <br />operation of the trap may be very labor intensive during migration <br />season. Also, the experiment may only prove that the fish will enter a <br />ladder and ascend four pools. If the full-size ladder is constructed, <br />the total cost for the two-season construction is $120,000 greater than <br />the total cost for Alternate No. 1. In addition, the fish may not be <br />able to ascend all 24 pools, which would not be concluded from the ini- <br />tial experiment. The design and construction costs of this experimental <br />• ladder are $410,300. <br />35 <br />