Fenn Dam, located in Haverhill, New Hampshire, is a privately owned earth dam built for recreational purposes in 1984. The dam stands at a height of 36 feet and stretches 435 feet in length, with a storage capacity of 48 acre-feet. Situated on TR Clark Brook in Grafton County, this dam is regulated by the NHDES Dam Bureau and undergoes state inspection and enforcement to ensure its safety and compliance with regulations. Despite being classified as having a low hazard potential, the dam's condition was assessed as unsatisfactory in 2014, indicating a need for maintenance and improvements.

The dam's spillway, with a width of 5 feet, is uncontrolled, and it has a moderate risk level assigned to it. The associated risk management measures and emergency action plans for Fenn Dam are not explicitly documented, suggesting a potential area of improvement in terms of preparedness for any unforeseen events. With a drainage area of 0.86 square miles and a maximum discharge capacity of 639 cubic feet per second, Fenn Dam plays a crucial role in managing water resources in the region while also providing recreational opportunities for the local community. Climate and water resource enthusiasts would find Fenn Dam an intriguing site to explore, given its unique design and regulatory oversight within the picturesque landscapes of New Hampshire.