Hickory Lake Dam, located in Polk, Iowa, was completed in 1970 and serves multiple purposes including fire protection, stock, and small fish pond management. The dam, designed by USDA NRCS, is privately owned and regulated by the Iowa Department of Natural Resources. It spans 315 feet in length and stands at a height of 34 feet, holding a maximum storage capacity of 113 acre-feet with a normal storage capacity of 72 acre-feet.

Situated on TR-Four Mile Creek, Hickory Lake Dam has a low hazard potential and is classified as having a moderate risk level. The dam features an earth structure with a soil foundation and an uncontrolled spillway type. Despite its last inspection dating back to 1997, the dam remains in a "Not Rated" condition assessment, emphasizing the importance of regular maintenance and inspections to ensure its safety and functionality. With its scenic location and environmental impact on the surrounding area, Hickory Lake Dam serves as a vital component in water resource management for the community of Berwick and beyond.

While Hickory Lake Dam does not fall under the jurisdiction of the US Army Corps of Engineers, its presence contributes to the overall water management strategy for the region. With its capacity to provide essential services such as fire protection and stock pond management, the dam plays a crucial role in enhancing the resilience of the local ecosystem. As climate change continues to impact water resources, Hickory Lake Dam stands as a testament to the importance of sustainable water infrastructure and the need for ongoing monitoring and maintenance to ensure its long-term functionality and safety.