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1967 through 1985 at 10 United States Geological Survey (USGS) gaging stations. Next, <br />flows for recovery of the fishes were projected as well as depletions for future activities with <br />and without endangered fishes. These projections took into account both listing and proposed <br />critical habitat designations. An illustration of the hydrograph for one gaging station <br />(Colorado River at Cisco, Utah) is shown in Figure I-5-1. The details of this analysis are <br />available in Chapter II-6 of Volume II. <br />The hydrologic analysis formed the basis for the without fish and the with fish scenarios. <br />There are four hydrologic scenarios and these can be discussed in the context of Figure I-5-1: <br />1. Current depletions without any actions taken on behalf of the <br />endangered fishes (the dotted line in row 1 of the figure); <br />2. Current depletions but with actions taken on behalf of the endangered <br />fishes (the dashed line in row 1 of the figure); <br />3. Future depletions to be allowed without considerations of the <br />requirements of the endangered fishes (dotted line in row 2 of the <br />figure); <br />4. Future depletions taking into account the requirements of the <br />endangered fishes (dashed line in row 2 of the figure). <br />The solid lines represent USFWS identified flow levels believed necessary for recovery of the <br />endangered fishes after being modified to be compatible with outputs of the Colorado River <br />System Simulation model. A critical element of the economic analysis involved determining <br />the economic impacts in the study region due to changes in the river flows as required for <br />recovery of the endangered fishes.. This involved assessing the impacts of revised operating <br />plans of the dam system on recreation, hydroelectric generation, agriculture, municipal, and <br />industrial water uses. <br />I-22 <br />