The San Francisco Public Utilities Commission has been hard at work to replace and upgrade aging infrastructure and reservoirs that make up the 80-year-old Hetch Hetchy water system. The most expensive and biggest of the jobs is replacing a 90-year-old earth and rock-filled Calaveras dam.
The San Francisco Public Utilities Commission has been hard at work to replace and upgrade aging infrastructure and reservoirs that make up the 80-year-old Hetch Hetchy water system. The most expensive and biggest of the jobs is replacing a 90-year-old earth and rock-filled Calaveras dam.
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