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"The dam, anchored in unstable[citation needed] Navajo sandstone (sometimes said to be "solidified sand dunes"),[2] nearly failed in 1983 as the result of a flood on the upper Colorado River that led to extended use of its tunnel spillways. The spillways, designed for short-term use, soon underwent cavitation and began to fail. Emergency installation of 8-foot (2.4 m) flashboards and other efforts narrowly averted total failure.
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