Crystal Springs Dam, Gravity dam in San Mateo County, US.
Crystal Springs Dam extends 600 feet across San Mateo Creek, standing 140 feet tall with a concrete structure that creates Lower Crystal Springs Reservoir.
The dam's construction in 1888 marked a milestone in American engineering, as it became the tallest dam in the United States and the largest concrete structure worldwide.
The structure represents the engineering achievements of the Spring Valley Water Company, which developed water infrastructure to support San Francisco's expanding population.
Skyline Boulevard crosses over the dam structure, providing vehicle access while serving as the starting point for the Sawyer Camp Trail.
The dam's location 300 yards from the San Andreas Fault demonstrates its resilience, having withstood both the 1906 San Francisco and 1989 Loma Prieta earthquakes.
Location: San Mateo County
GPS coordinates: 37.52850,-122.36200
Latest update: March 7, 2025 11:28
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