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Armco Park Mound I and Armco Park Mound II are listed as sites of special historic significance in Warren County, Ohio. Further, these Adena mounds have been on the National Register of Historic Places since 1975. However, since that time, much of the surrounding area has been developed as residential subdivisions, golf courses, and a public park. With changes in land ownership, the existence of these mounds was sometimes noted in records, but their specific locations were not. Amateur exploration of the park to determine the state of these mounds revealed that Armco Park Mound II has been destroyed, while Armco Park Mound I represents just one of five mounds in close proximity, four being only now discovered and described here. These potentially represent well-preserved examples of Adena earthworks which have only narrowly avoided destruction in recent years.
Keywords: mound, earthwork, Adena, Hopewell