Okmulgee Park in Okmulgee, Oklahoma, spans 1,075 acres along Okmulgee Lake and reflects both natural and public works history. The area preserves rocks from the Pennsylvanian Period and is one of the very few places in the world where the rare fossil Gymnophyllum wardi, or button coral, is found. Much of the park’s infrastructure was built during the Great Depression by the Works Progress Administration and Civilian Conservation Corps, including improvements to the lake’s dam and spillway. Established as a municipal park in 1963, it offers recreation around the 668-acre lake, while the Lake Okmulgee Dam Spillway Cascade is recognized on the National Register of Historic Places.