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National Park System shall not contain developments inconsistent with preservation in their natural state for human wonder and enjoyment. The Congress, of course, can always authorize any development it feels necessary, even though it were to infringe park or monument lands. In establishing Grand Canyon National Park, the Congress anticipated need for encroachment and included the following language in the Act of February 26, 1919, authorizing the Park: "That whenever consistent with the primary purposes of said park the Secretary of the Interior is authorized to permit the utilization of areas therein which may be necessary for the development and maintenance of a Government reclamation project..." The question therefore arises whether a high dam at Bridge Canyon is consistent with the preservation of the Park and Monument in their natural state. Clearly, the reservoir would change the ecological situation of the canyons. Existing wildlife habitats would be drowned out. Colonization by salt cedar could be expected to form impenetrable thickets. Silt deposition would occur. Also, floating debris would accumulate in the reservoir area and at the mouth of tributaries in the Park of Monument unless steps were taken to remove it at frequent intervals. Mineral staining of the canyon wall, in the zone of surface fluctuation, would occur. In addition to inundation of many significant geological and scenic 3Epson Perfection 4870 Photo, 400 dpi, 8 bit, 14,301,184 byte