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Sand boils are a natural phenomenon that can occur during periods of high water in flatland areas in the lower Mississippi Valley. While they can be dangerous in themselves – tractors have been known to disappear into them – they normally are not an immediate threat to the levee system. Col. Jeff Eckstein explained why the Corps of Engineers is keeping a close watch for sand boils during the current period of high water. His remarks were made during a presentation at the Delta Council annual meeting.