If water level then drops, it may lower below the penstock openings, which are higher up on the dam face, then the release capacity of the dam drops to zero, and the Colorado River below the dam could remain dry until the next major spring inflow, and only springs, seeps and tributaries such as the Paria, Little Colorado and Virgin River would replenish its flow during these times, perhaps causing unprecedented drops in levels of Lake Mead as well.
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The Glen Canyon Dam, a concrete arch dam on the Colorado River in the U.S. state of Arizona, has had both positive and negative impacts, which have been covered in many literary works.
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