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The site area is 2,735 acres. In 2002, it received 49,950 visitors.
It was authorized as a national historic site on April 2, 1957 under nonfederal ownsership. It was authorized for federal ownership and administration by act of Congress on July 30, 1965.
In 1978, a general master plan for the site was adopted which included the goal of maintaining the site's historic scene as closely as possible to its appearance and characteristic in 1869.