Strum, also known as Crystal Lake, is a gravity dam located in Trempealeau, Wisconsin, along the Buffalo River. Built in 1937, this dam primarily serves the purpose of flood risk reduction, while also offering recreational opportunities for visitors. With a height of 19 feet and a length of 750 feet, Strum has a normal storage capacity of 155 acre-feet and a maximum discharge rate of 10,485 cubic feet per second.

Managed by the local government and regulated by the Wisconsin Department of Natural Resources, Strum has a low hazard potential and is assessed to be in fair condition as of November 2017. The dam is regularly inspected, with the last inspection conducted in November 2012. Despite its low hazard potential, Strum is considered to have a very high risk assessment rating of 1, indicating the importance of continued monitoring and risk management measures to ensure the safety and integrity of the structure.

Overall, Strum plays a crucial role in mitigating flood risks in the area and provides a valuable resource for both flood control and recreational purposes. With its historical significance and strategic location along the Buffalo River, Strum remains an essential component of water resource management in Wisconsin.