The purpose of this study was to determine what effect the Arkansas River Multiple-Purpose Plan will have on the quality of the city of Ozark's well water supply. Particular attention was directed toward the Ozark Lock and Dam project which is now under construction since the well field will adjoin the reservoir. This study includes an estimation of the chemical quality of water to be impounded in the Ozark Reservoir, the probable withdrawal rate from the wells for municipal water for the year 1970, the chemical quality that can be expected in the municipal water supply, and the extent of damages, if any, that may happen to the supply as a result of the completion of the Arkansas River Multiple-Purpose Plan. (Author)