The report, therefore, contains data relative to the physical features of the upper Mississippi River watershed and the river channel; summaries of total and sewered population, with estimates of sewered population equivalent to the industrial waste pollution; estimates of discharge and times of flow; and a summary of the chemical and bacteriological findings at various points on the section of the river under investigation. These data are presented in a series of basic tabulations, condensed to the form of monthly averages, with a discussion of the salient features of each.