Green Valley Lake
Key Takeaway
Green Valley Lake is classified as high hazard in California. It was completed in 1956 and is 70 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 | 40 ft (taller than 46.3% in CA) |
| Dam Length | 330 ft |
| Dam Type | Earth |
| Max Storage | 150 acre-ft |
| Surface Area | 11 acres |
| Drainage Area | 1 sq mi |
| Year Completed | 1956 (70 years old) |
| NID ID | CA00597 |
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
Private Entity
Private
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High Hazard 83 ftB. J. Robinson
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High Hazard 30 ftMunicipal
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High Hazard 56 ftTerminal
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Low Hazard 24 ftJameson Vineyards
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Significant Hazard 41 ftFrequently Asked Questions
What is the hazard classification of Green Valley Lake?
Green Valley Lake 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 Green Valley Lake?
Green Valley Lake is owned by Private Entity (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Green Valley Lake built?
Green Valley Lake was completed in 1956, making it 70 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 Green Valley Lake?
Green Valley Lake serves the following purposes: Water Supply, Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Green Valley Lake?
Green Valley Lake has a dam height of 40 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 Green Valley Lake last inspected?
Green Valley Lake was last inspected on April 18, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.