Author James A. Michener donated the High Rocks area to the park in 1956.
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Ralph Stover State Park was the site of an 18th-century gristmill that was built on Tohickon Creek by the park's namesake, Ralph Stover.
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The next addition to the park was the High Rocks unit of Ralph Stover State Park, donated to the Commonwealth by the late James Michener, a famous local author.