Episode Details

Silicon Valley’s Anderson Dam, a 240-foot relic from 1950, is getting a $3.2 billion seismic upgrade to survive a major earthquake—raising its wall by 7 feet, replacing critical pipelines, and rebuilding for flood control. Construction starts in 2027, wrapping by 2033, after a new tunnel replaces an old outlet pipe. Built to withstand today’s quake risks, the dam’s failure could unleash catastrophic flooding across Silicon Valley to Monterey Bay. Drained in 2020 as a precaution, this 10-year project is vital for water security and public safety.

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