For six months in the summer and autumn of 1969, Niagara’s American Falls were “de-watered”, when the Army Corps of Engineers conducted a survey of the falls’ rock face, concerned that it was becoming destabilized by erosion. During that period, while workers cleaned the former river-bottom and drilled test-cores in search of instabilities, a temporary walkway was installed twenty feet from the edge of the dry falls, and tourists were able to explore this otherwise inaccessible landscape.
