Green Swamp #2 Dam
Key Takeaway
Green Swamp #2 Dam is classified as high hazard in New Jersey. It was completed in 1925 and is 101 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 | 65 ft (taller than 97.9% in NJ) |
| Dam Length | 1,140 ft |
| Dam Type | Concrete |
| Normal Storage | 79.7K acre-ft |
| Surface Area | 2,590 acres |
| Drainage Area | 90 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1925 (101 years old) |
| NID ID | NJ00210 |
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
North Jersey District Water Supply Commission
State Government
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Significant Hazard 21 ftFrequently Asked Questions
What is the hazard classification of Green Swamp #2 Dam?
Green Swamp #2 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 Green Swamp #2 Dam?
Green Swamp #2 Dam is owned by North Jersey District Water Supply Commission (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Green Swamp #2 Dam built?
Green Swamp #2 Dam was completed in 1925, making it 101 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 Swamp #2 Dam?
Green Swamp #2 Dam 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 Green Swamp #2 Dam?
Green Swamp #2 Dam has a dam height of 65 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 Swamp #2 Dam last inspected?
Green Swamp #2 Dam was last inspected on October 6, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.