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I I I I I I I I I I I I I I I I I I I be maintained if the year of construction is an average or wet year. Should the construction occur during a dry year and the reservoir elevation is below 8090 ft, there will be no need to lower the water level further. The elevation 8090 ft has been determined to be the limit for lowering the reservoir because of the impacts to the reservoir fishery. The CDOW has donated the use of four flat bottomed boats (18 ft long by 6 ft wide by 2 ft deep) which are located in Durango, and are available for project use to clos~ the outlet. This will save the District a great deal of money because renting and transporting similar boats \~ould cost between $5,000 - $10,000. The four boats are designed to be bolted together to form a barge which the divers will use for a base. The plug would be floated on the barge as each boat is capable of carrying 3300 pounds with a 6-inch displacement. In exchange for the CDOW's assistance, an agreement has been reached, between the parties, not to lower the reservoir to a level what would impact the fishery. Cooperative agreements, such as this, are in the best interest of all con- cerned. On the selected day to begin closing the outlet, the would assemble the boats and load the necessary equipment. divers will require a full complement of equipment such as intensity lights, compressors, and a decompression chamber. crew The high The plans to close the outlet will generally include: 1) raising one trash rack by using an air bag (the intake structure cannot be entered from the top so the plug will have to be in- serted from the side once the trash rack is removed), 2) setting up rigging to pull the plug into the intake structure, 3) lowering the plug by use of an air lift bag, a hoist mounted on the barge or both, 4) closing the outlet gates so that there is little or no flow into the outlet (the outlet can be closed for only one hour 6.0-9