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A dam may appear in our minds to be permanent, a monument to the ages, when dams are, of course, structures that can be redesigned or removed if we will it so. Since 1950, sixty-seven dams have been removed because of safety concerns, for the restoration of riparian habitat, to improve fish passage, for erosion control, to enhance recreational opportunities, because the dam failed, for the removal of invasive bullfrog breeding sites, and for flood control.
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Obi Kaufmann (The State of Water: Understanding California's Most Precious Resource)