Okmulgee State Park is an Oklahoma park in Okmulgee County, Oklahoma in the United States. The park is and sits at an elevation of. The park is adjacent to Dripping Springs State Park and is located on Okmulgee Lake. Okmulgee Park, a municipal park established in 1963, is open for year-round recreation including camping, fishing, swimming and hiking. It is close to where The Muscogee Indians were forced to move in Oklahoma pursuant to the Indian Removal Act.HistoryOkmulgee State Park is on land that was at the bottom of a vast inland sea 200 to 350 million years ago. The rocks at the park date back to the Pennsylvanian Period. Okmulgee and neighboring Dripping Springs State Park are two of the very few places in the world where the rare fossil, Gymnophyllum wardi also known as "button coral", can be found.The facilities of Okmulgee and Dripping Springs Parks were constructed by the Works Progress Administration and Civilian Conservation Corps. The WPA and CCC were work relief programs for men from unemployed families, established during the Great Depression. As part of President Franklin D. Roosevelt's New Deal legislation, they were designed to combat unemployment during the Great Depression. The WPA and CCC operated in every U.S. state. The men of the WPA and CCC replaced an earthen dam at Okmulgee Lake which was built in 1927. They also built a spillway and many of the park facilities that are still in use today.