Grade Lake Dam, located in Osceola, Iowa, is a vital water resource structure designed by CB&Q RR and Ray Henley in 1900. With a height of 44 feet and a length of 1300 feet, this earth dam serves the primary purpose of recreation, offering a surface area of 25.7 acres for leisure activities. The dam's reservoir provides a normal storage capacity of 217 acre-feet and a maximum storage of 865 acre-feet, making it a significant water source in the region.

Managed by the Iowa Department of Natural Resources, Grade Lake Dam is regulated, inspected, and enforced by state authorities to ensure its safety and functionality. The dam's spillway type is uncontrolled, with a width of 4 feet, while its hazard potential is classified as high, signaling the need for regular monitoring and risk management measures. Despite its moderate risk assessment, the dam's condition is deemed satisfactory as of the last inspection in May 2019, highlighting its importance in water resource management and climate resilience efforts in the area.

Water resource and climate enthusiasts can appreciate Grade Lake Dam as a key infrastructure supporting recreational activities and water storage in Clarke County, Iowa. As a state-regulated dam with a significant storage capacity and high hazard potential, its management and maintenance play a crucial role in ensuring public safety and environmental sustainability. With a rich history dating back to the early 20th century, Grade Lake Dam stands as a symbol of resilience and innovation in water resource engineering, serving as a valuable asset in the region's efforts to adapt to changing climate conditions and enhance water security.