Lower Crystal Springs
Key Takeaway
Lower Crystal Springs is classified as high hazard in California. It was completed in 1888 and is 138 years old. Its primary use is water supply. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.
Physical Details
| Dam Height | 149 ft (taller than 89.8% in CA) |
| Dam Length | 600 ft |
| Dam Type | Gravity |
| Max Storage | 57.9K acre-ft |
| Surface Area | 1,323 acres |
| Drainage Area | 29 sq mi |
| Year Completed | 1888 (138 years old) |
| NID ID | CA00127 |
Safety Information
Loss of human life is likely if the dam fails.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
City and County of San Francisco
Local Government
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Low Hazard 17 ftFrequently Asked Questions
What is the hazard classification of Lower Crystal Springs?
Lower Crystal Springs is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Lower Crystal Springs?
Lower Crystal Springs is owned by City and County of San Francisco (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lower Crystal Springs built?
Lower Crystal Springs was completed in 1888, making it 138 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Lower Crystal Springs?
Lower Crystal Springs serves the following purposes: Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Lower Crystal Springs?
Lower Crystal Springs has a dam height of 149 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.
When was Lower Crystal Springs last inspected?
Lower Crystal Springs was last inspected on December 14, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.