Hemlock Lake Dam, located in Hartwood Club, Sullivan County, New York, is a privately owned structure primarily used for recreation. This earth dam, standing at a height of 27 feet and stretching 200 feet in length, was completed in 1890 and has a storage capacity of 536 acre-feet. The dam overlooks the Bush Kill river and has a controlled spillway with a width of 19 feet, showcasing engineering excellence from the late 19th century.

With a significant hazard potential and a very high risk assessment rating, Hemlock Lake Dam is under state regulation and inspection by the New York State Department of Environmental Conservation. While the dam's condition is currently not rated, its emergency action plan status and risk management measures are not specified. Despite its age, the dam continues to serve its recreational purpose, providing a serene backdrop for water resource and climate enthusiasts to appreciate and study.

As a historical landmark with a rich engineering heritage, Hemlock Lake Dam stands as a testament to early dam construction in New York State. Its picturesque setting and controlled spillway design make it a popular destination for outdoor enthusiasts and researchers alike. While its risk potential is noted, ongoing state oversight ensures the safety and integrity of this important water resource infrastructure for future generations to enjoy and learn from.