The trouble started when state officials began sending 100,000 cubic feet per second of water into the dam’s main spillway earlier this month to release storm runoff and prevent the lake from overflowing. The flows were halted after engineers discovered a gaping hole in the concrete spillway but it was too late. On Feb. 11, the elevation rose to 901 feet, causing water to flow over a weir into the dam’s spillway and carved a deep fissure into the support ot the 770-foot-tall dam.
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