An adaptation of the oceanographer’s dynamic height method to freshwater conditions, the method develops directly from the Smithsonian Tables of water density as a function of temperature and from Amagat’s coefficients of compressibility. Pressure effects are handled by use of the decibar system. The calculated dynamic heights are plotted and contoured. Current directions are obtained by application of the geostrophic principle; current velocities are computed from the slopes of the surface topography. A table of specific volume anomalies, necessary for the height computation, has been developed. Sources of potential error are reviewed and assessed. The method has been applied to three synoptic surveys of Lake Huron, and the results obtained are both internally consistent and in good agreement with the behaviors of other parameters. When used with proper caution the method appears to be a promising technique for the study of certain circulation phenomena of large deep lakes.