Greenwood Lake Dam
Key Takeaway
Greenwood Lake Dam is classified as high hazard in New Jersey. It was completed in 1928 and is 98 years old. Its primary use is recreation. 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 | 17 ft (taller than 63.3% in NJ) |
| Dam Length | 270 ft |
| Dam Type | Concrete |
| Normal Storage | 13.3K acre-ft |
| Surface Area | 1,733 acres |
| Drainage Area | 27 sq mi |
| Year Completed | 1928 (98 years old) |
| NID ID | NJ00187 |
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
Division of Parks and Forestry
State Government
Nearby Dams
Green Turtle Pond Dam
Passaic, NJ
High Hazard 35 ftPinecliff Lake Dam
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High Hazard 15 ftWest Milford Lake Dam
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High Hazard 16 ftCascade Lake Dam
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Significant Hazard 16 ftUpper Greenwood Lake Dam
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High Hazard 20 ftCarpi Lake Dam
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Significant Hazard 12 ftMonksville Dam
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High Hazard 150 ftMount Laurel Lake Dam
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Low Hazard 15 ftFrequently Asked Questions
What is the hazard classification of Greenwood Lake Dam?
Greenwood Lake Dam 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 Greenwood Lake Dam?
Greenwood Lake Dam is owned by Division of Parks and Forestry (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Greenwood Lake Dam built?
Greenwood Lake Dam was completed in 1928, making it 98 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 Greenwood Lake Dam?
Greenwood Lake Dam serves the following purposes: Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Greenwood Lake Dam?
Greenwood Lake Dam has a dam height of 17 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 Greenwood Lake Dam last inspected?
Greenwood Lake Dam was last inspected on November 15, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.