Lloyd Keller, also known as Greenberg Farms LLC, is a privately owned dam located in Marathon, Wisconsin, along the TR EAU PLEINE river. Built in 1966 by the USDA NRCS, this earth dam stands at a height of 10 feet and stretches 1020 feet in length. The dam serves primarily for recreational purposes and has a maximum storage capacity of 80 acre-feet.

Managed by the Wisconsin Department of Natural Resources (WIDNR), Lloyd Keller is regularly inspected, with the last assessment conducted in September 2010. Classified as a low hazard potential structure with a moderate risk assessment score of 3, the dam has not been rated for its current condition. While it has an uncontrolled spillway type, the dam poses no imminent threat. Despite its age, Lloyd Keller remains a vital part of the local water resource infrastructure, providing recreational opportunities in the area.

With its serene location in the heart of Wisconsin, Lloyd Keller offers a peaceful retreat for water resource and climate enthusiasts alike. As a well-maintained and regulated structure, it stands as a testament to responsible water management practices, ensuring the safety of surrounding communities and the preservation of the natural environment. Whether for fishing, boating, or simply enjoying the beauty of the TR EAU PLEINE river, Lloyd Keller continues to be a valuable asset for both locals and visitors to explore and appreciate.