Mont Helena may have had as many as three mounds in the past. The remaining mound is 26 feet high, but its original dimensions were even more impressive. Roughly 10 feet of mound fill was removed around 1900 prior to the construction of the Colonial Revival home now located on its summit, and flood deposits have likely buried several more feet at its base. Native Americans built the mound by alternating layers of clay and sand during the Mississippi Period (ca. AD 1200-1600).
