February 9, 1971, Granada Hills, CA (Al Markado-photographer)

The 1971 San Fernando earthquake with a 6.6 magnitude and large aftershocks caused over $500 million in damages and destruction to infrastructure; including the collapsed freeway overpasses on the Interstate freeways 5, 14, and 210, destruction of several hospitals in the North Los Angeles area, and damage to the Van Norman Dam in Granada Hills. The dam, which crumbled during the earthquake and during the following aftershocks, held approximately 3.6 billion gallons of water. Around 80,000 residents were required to evacuate from the area for three days due to fears that the whole area would be flooded by the dam’s water reserve.

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