[Click each for a larger view]
In 1969, the US Army Corps of Engineers built a series of coffer dams which stopped or rather reduced the water flow over the American Falls to a mere trickle. This was done to allow a study of the rock formations at the crest of the Falls and to study the feasibility of whether there was any possible way to remove the rock (talus) at the base of the American Falls. In the end, the engineers decided to let mother nature take its course.
Check out this YouTube video of old footage (thanks to Harold T.)
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