Lake Denmark
Key Takeaway
Lake Denmark is classified as high hazard in New Jersey. It was completed in 1904 and is 122 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 | 12 ft (taller than 31.2% in NJ) |
| Dam Length | 360 ft |
| Dam Type | Earth |
| Max Storage | 3.2K acre-ft |
| Normal Storage | 2.3K acre-ft |
| Surface Area | 299 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 402 cfs |
| Year Completed | 1904 (122 years old) |
| Year Modified | 2012 |
| NID ID | NJ00001 |
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
Picatinny Arsenal
Federal Government
Nearby Dams
Longwood Lake Dam
Morris, NJ
High Hazard 22 ftGreen Pond Reservoir Dam
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Low Hazard 15 ftLake Telemark Dam
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Significant Hazard 11 ftLake Ames Dam
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Significant Hazard 9 ftPicatinny Lake
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High Hazard 15 ftLake Hudsonia Dam
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Significant Hazard 10 ftMt. Hope Pond Dam
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Significant Hazard 15 ftMount Hope Lake Dam
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High Hazard 18 ftFrequently Asked Questions
What is the hazard classification of Lake Denmark?
Lake Denmark 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 Lake Denmark?
Lake Denmark is owned by Picatinny Arsenal (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lake Denmark built?
Lake Denmark was completed in 1904, making it 122 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 Lake Denmark?
Lake Denmark serves the following purposes: Water Supply, Fire Protection, Stock, Or Small Fish Pond, Fish And Wildlife Pond, Recreation, Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Lake Denmark?
Lake Denmark has a dam height of 12 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 Lake Denmark last inspected?
Lake Denmark was last inspected on July 24, 2018. Inspection dates indicate when a formal review occurred, not the results of that inspection.