 The loss of their traditional fishing grounds at Celilo Falls during the construction of The Dalles Dam in March 1957 dealt both a spiritual and an economic blow to the tribe.Originally called "Rockport" or "Rockland Flats", Dallesport was the site of the first ferry crossing in the area, beginning in 1854.Rockland Flats was the original seat of Clickitat County (the name of the county was spelled with a "C" until an official name change in 1869), and remained so until 1878.