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AP Analysis Finds Growing Number of Poor, High-Hazard Dams

Constructed four generations ago, the massive rock and clay dam at El Capitan Reservoir is capable of storing over 36 billion gallons of water, enough to supply every resident in San Diego for most of a year.

Today, it’s three-quarters empty, intentionally kept low because of concerns it could fail under the strain of too much water.

During “a big earthquake, you never know what’s going to happen, if this is going to hold,” said Samuel Santos, a longtime resident who frequently fishes near the dam.