The study or analysis which follows is concerned primarily with the effects of the Oahe Dam and Reservoir on the economy and social organization of the Standing Rock Indians. It deals not only with the immediate losses which will be sustained by the families living within the taking area, but also with the impact on the economy of the population living on the residual reservation which will result from the relocation of families. This study is concerned, not with the benefits that may result from the Oahe project but with the flooding of Indian lands by the reservoir, and the resulting loss and injury to the economy and social organization of the Standing Rock Sioux Indians in North Dakota and South Dakota.