Castle Rock is a gravity dam located on the Wisconsin River in Wisconsin Dells, Wisconsin. Built in 1950 by HARZA ENGINEERING CO, this hydroelectric dam serves multiple purposes including flood risk reduction, hydroelectric power generation, and recreation. With a height of 34 feet and a hydraulic height of 38 feet, Castle Rock has a storage capacity of 175,000 acre-feet and a normal storage capacity of 136,000 acre-feet.

The dam has a spillway width of 480 feet and is classified as having a high hazard potential. Controlled by the Federal Energy Regulatory Commission, Castle Rock is not state-regulated but does require state permitting and enforcement. Despite its age, the dam's risk assessment is very high at level 1, indicating the need for ongoing monitoring and management measures to ensure its safety and functionality for the surrounding community.

Castle Rock's location in Adams County, Wisconsin, makes it a pivotal structure in managing the water resources of the region. With its significant storage capacity and role in hydroelectric power generation, the dam plays a crucial role in water management, flood control, and energy production in the area. As a popular recreational spot for locals and visitors alike, Castle Rock offers not only practical benefits but also serves as a scenic destination for water resource and climate enthusiasts to explore and appreciate the intersection of nature and infrastructure.