Limnological and Meteorological Observation Towers in the Great Lakes

Six limnological and meteorological single-shaft towers of 4-in. pipe were installed in 3 of the Great Lakes by the Great Lakes Institute, University of Toronto. The towers were of two types, a shallow-water tower for depths of less than 60 ft where the base of the tower rested directly on the lake bottom, and a deep-water tower supported by a buoyancy tank 25 ft below lake level. A platform on the towers, situated 8 to 12 ft above lake level, gave a stable base to house limnological and meteorological instruments and recorders. The platform and upper part of tower were designed for easy removal and reinstallation.