Melvern Dam is a significant earthfill dam located in Osage County, Kansas. Constructed in the 1970s, it serves multiple purposes, including flood control, water supply, and recreation. The dam creates Melvern Lake, which is a popular destination for fishing, boating, and camping. The dam is managed by the U.S. Army Corps of Engineers and plays a crucial role in managing water resources in the region. It helps to regulate the flow of the Marais des Cygnes River, ensuring that downstream areas are protected from flooding while providing a reliable water source for local communities.