A rather comprehensive surveillance of water quality conditions has been maintained in Fort Loudoun Reservoir on the Tennessee River near Knoxville, Tennessee. The report examines the significance of the observed reservoir water quality and considers the role of controlled discharges through the reservoir in effecting these conditions. In addition the results of thesis investigations supported by the project are summarized. During the period covered by these investigations, the Knoxville Third Creek Sewage Treatment Plant was upgraded from a primary plant to a secondary (activated sludge) treatment plant. Comparison of the collected data is undertaken herein to elucidate the impact of these modifications upon reservoir water quality. Consideration is given to the improvements of water quality as related to the expenditure for modification of the treatment facilities.