One of the great features of the American Falls are the multitude of rocks at the bottom. They started as natural rockslides but in 1969 with concerns about too much erosion, the water was shut off so that geological engineers could investigate and stabilize the rockbed. They decided to keep the fallen rocks in place.
There was talk of shutting off the falls again in 2019 in order to repair the bridges to Goat Island, but that was delayed due to lack of funds.
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