Sheep Rock Shelter is an area of archaeological significance near the present-day Susquehannock Campground. Originally a wide ledge over the Juniata River, it provided shelter from the elements for its inhabitants. Its location and orientation preserved the remains buried below by protecting them from wind and moisture. When it was announced in the 1960s that the lake would be expanded, Juniata College and Pennsylvania State University excavated to uncover artifacts that would otherwise be flooded, ending their state of preservation. Their work recovered human remains from as long as 12,000 years ago. The Penn State University Library holds a 29-minute film about the site, titled "Discovery at Sheep Rock."
