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<br />included in the flood control benefit calculations. The average <br />annual flood control benefits attributable to the Narrows Unit <br />would be $836,000. <br /> <br />Water Qua 1 i ty for Recrea ti on <br /> <br />" <br /> <br />The results of recent investigations indicate that primary contact <br />activities would be' permitted at Narrows Reservoir. Of the current <br />State standards for bacteria in recreational waters used for primary <br />contact activities, all are met with the exception of that for fecal <br />streptococci. However, there are indications that the fecal streptococci <br />in the river in the area of the Narrows Unit originate from other than <br />municipal or domestic sources and may be of little sanitary significance. <br />The actual source of the fecal streptococci is not known. In addition, <br />the reservoir would meet the proposed standards of the State. There- <br />fore, recreation benefits as evaluated by the National Park Service <br />have not been changed. <br /> <br />Other recent studies of potential thermal stratification and eutrophi- <br />cation indicate that neither condition would adversely affect either <br />recreation or the fishery in Narrows Reservoir. <br /> <br />'; <br /> <br />Effects of Narrows Unit on the Platte River'System <br /> <br />The Bureau concludes, based upon the'morphological study, that the <br />Narrows Unit would have no effect on ice-affected flows and occurrence <br />of ice jams. t,1inimal effect,if any, on the dominant discharge of the <br />Platte River in central Nebraska is expected. As a result of minimal <br />change, if any, in the dominant discharge and ice-induced scour through <br />this reach of the Platte River, it is anticipated that the unvegetated <br />channel width will remain essentially unchanged. Present annual variations <br />in the areal extent and location of the sandbars used for night roosting <br />are not expected to be altered. In addition, the Narrows Unit would <br />have minimal effect on the river stages that apparently contribute to <br />the high ground-water levels underlying the wet meadow habitat complex <br />during the January-April period. <br /> <br />Therefore, the Bureau concludes that construction and operation of the <br />Narrows Unit would have no adverse effect on habitat components identified <br />as critical to migrating sandhill cranes; wet meadow complex, sandbar <br />roosting areas (Frith, 1974). Whooping cranes have been described by <br />Frith and the Fish and Wildlife Service (1975) as migrating with and <br /> <br />2 <br />