Understanding the hydraulic characteristics of rivers is necessary to understand how effluents and their contaminants are mixed and transported, and where they are deposited in rivers. To properly model the transport of contaminants and pollutants within freshwater systems, the mixing or dispersion characteristics must be established. The tracer dye study focused on the calculation of mixing coefficients and travel times using field dye tests on the Peace River between Shaftsbury Ferry and Notikewan River. The test was completed under ice covered conditions in February and March 1993, the period most critical for potential impacts on the aquatic ecosystem.