In 1969, the water that usually rushes from the Falls was diverted by the Army Corps of Engineers so they could remove the rocks, or talus, that started gathering at the bottom of the American Falls due to erosion. There had been two major rock falls in 1931 and 1954, and this began the conversation about “the imminent death” of the American Falls. In 1965, the United States Congress approved legislation to stop the Falls to take care of the problem. Humans beings stopped the 150,000 gallons of water that flowed per second.
In November of that year, after removing some of the loose rocks and shoring up the falls with mechanical bolts, the engineers destroyed their dam and rewatered the falls.