Crystal, also known as Little Hope, is a gravity dam located in Waupaca, Wisconsin, owned by the local government and regulated by the Wisconsin Department of Natural Resources. Completed in 1948, this dam serves primarily for recreational purposes, offering a serene spot for visitors to enjoy the surrounding area. With a dam height of 10 feet and a hydraulic height of 7 feet, Crystal has a normal storage capacity of 30 acre-feet and a maximum discharge of 870 cubic feet per second.

Despite its age, Crystal remains a significant structure with a hazard potential rated as "Significant" and a risk assessment of "Very High (1)". Although the dam's condition assessment is marked as "Not Rated", regular inspections are conducted every 3 years to ensure its safety and functionality. The dam's emergency action plan status and risk management measures are currently undetermined, highlighting the importance of ongoing monitoring and maintenance to mitigate any potential risks associated with this essential water resource.