The American Camp visitor center is open 8:30 a.m. to 4:30 p.m.Wednesday-Sunday. The English Camp contact station is closed through May 31. Grounds at both units are open from dawn to 11 p.m.
The island marble butterfly was once thought extinct until it was spotted on the American Camp prairie in 1998. The park, in cooperation with the U.S. Fish and Wildlife Service actively monitors the butterfly.
Last Updated: 04/18/2014