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VIDEO | 02:38
The engineering marvel that carries water under a mountain to Southern California

The engineering marvel that carries water under a mountain to Southern California

The San Jacinto Tunnel is a 13-mile-long, concrete-lined water tunnel built between 1933 and 1939, carrying Colorado River water beneath the San Jacinto Mountains to Southern California. As part of the Colorado River Aqueduct, it remains a critical piece of 1930s-era infrastructure.

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