This concluding chapter demonstrates that under state management, Starved Rock State Park grew in popularity. The park provided specialists from the US Army Corps of Engineers with a training area to master the military art of pontoon bridge assembly in preparation for the Allied invasion of Germany in World War II. Equally important, the park was where locals came to work and to relax in the 1950s and 1960s, and it is where today over two million people come to hike, camp, picnic, fish, hunt, and enjoy nature every year. However, the very geologic composition of Starved Rock and its environs has created a new challenge for the twenty-first century. Sand companies now mine silica sand near the park. The challenge is one of balance between protection of the park's fragile natural resources versus the competing interests of local governments and residents desiring new employment opportunities. In addition, the Starved Rock Dam, completed in 1933, raised the level of the Illinois River above the dam about ten feet. Nevertheless, the Illinois Department of Natural Resources employees at Starved Rock State Park are dedicated to preserving and maintaining the park and to serving park visitors.