Crystal Lake Dam in DeWitt, Iowa, is a private earth dam built in 1900 for recreational purposes along Crystal Creek. Standing at a height of 24 feet and stretching 490 feet in length, the dam has a storage capacity of 465 acre-feet, with a normal storage level of 210 acre-feet and a surface area of 35 acres. The dam is regulated and inspected by the Iowa Department of Natural Resources, ensuring its safety and compliance with state regulations.

Despite being classified as low hazard potential and not yet rated in terms of condition assessment, the dam's risk assessment is moderate. The spillway type is uncontrolled, with a width of 67 feet, and the dam is surrounded by rock and soil foundations. The last inspection date recorded was in October 1992, and there is no information available on the emergency action plan or risk management measures in place. With its location in Clinton County, Iowa, and its proximity to Detroit District, Crystal Lake Dam serves as a valuable recreational resource for the local community and visitors alike.