The report presents a study of Lake Thunderbird, in Cleveland County, Oklahoma, its watershed, and surface runoff. The lake was monitored for water quality at a number of measurement sites. Physical parameters studied were temperature, total dissolved solids, turbidity and pH. Some fifteen chemical parameters as well as bacterial and zooplankton analyses were considered. The contribution of the watershed-soil-rainwater to the quality of the lake water was studied both in situ and in a laboratory simulation which used watershed soil samples. In general, results from the first 250 days indicated that a column-fed laboratory model of the lake could be established that was remarkably similar to the lake in terms of chemical water quality. It was concluded that a laboratory simulation of an impoundment system as a study/predictive tool is possible.