 A 90-foot (27.4 m) fall of the river at the rapids dictated the location of the Conowingo Dam and thus the resulting inundation of the Old Conowingo site by the subsequent Conowingo Reservoir.At the completion of the dam in 1928, farmers and villagers uprooted by the construction of the large hydroelectric facility gathered on the hillside to watch as the village met its water doom and old Conowingo slowly vanished beneath the water.The date was Jan. 18, 1928.