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In page Charlestown State Park:

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The park was scheduled for $3 million in improvements, which were delayed in January 2006 when workers building a new boat ramp found a Native American cooking area dating back to 2,000 B.C. The remains of firepits and stone slabs that would be used to crack nuts were found, as well as Laurel chert, from which stone tools were made. Only once the archaeological surveys were done could work on the improvements, including a five-lane boat ramp and a riverfront walking trail, continue. In September, 2006 construction of the new boat ramps restarted.[1] The boat ramp opened in June 2007.