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Protecting Thompson Lake for over 50 Years The mission of the Thompson Lake Environmental Association TLEA is to preserve the natural beauty water quality and biological diversity of Thompson Lake. TLEA will promote conservation practices through education and through monitoring and management of Thompson Lake and its watershed. November 9 1954 February 22 2025 TLEA is sad to announce the passing of Board Director Peter Siebert. We will never forget Peters commitment and his many years of tireless effort to protect the environment of Thompson Lake.