Sappa Lake Dam, also known as Oberlin Sappa Park Earth Dam, is a local government-owned structure located in Decatur, Kansas. Built in 1935, this earth dam stands at a height of 22 feet and spans a length of 440 feet along Sappa Creek. The dam has a storage capacity of 1162 acre-feet, with a normal storage level of 807 acre-feet, serving as a vital water resource for the surrounding area.

Managed by the Kansas Department of Agriculture, Sappa Lake Dam is regulated and inspected by state authorities to ensure its safety and functionality. Despite being classified as having a low hazard potential, the dam is rated as having a moderate risk level, indicating the need for ongoing risk management measures. The dam's spillway is designed as uncontrolled, and it currently does not have outlet gates or associated locks.

For water resource and climate enthusiasts, Sappa Lake Dam offers a glimpse into the intersection of infrastructure, water management, and environmental stewardship. With its historical significance and ongoing regulatory oversight, this dam serves as a reminder of the importance of maintaining and monitoring critical water infrastructure for the benefit of local communities and ecosystems.