Mirror Lake Dam
Key Takeaway
Mirror Lake Dam is classified as high hazard in New Jersey. It was completed in 1880 and is 146 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 | 18 ft (taller than 66.3% in NJ) |
| Dam Length | 750 ft |
| Dam Type | Earth |
| Max Storage | 2.5K acre-ft |
| Normal Storage | 1.9K acre-ft |
| Surface Area | 215 acres |
| Drainage Area | 37 sq mi |
| Max Discharge | 193 cfs |
| Year Completed | 1880 (146 years old) |
| NID ID | NJ00458 |
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
Township of Pemberton
Local Government
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Low Hazard 8 ftFrequently Asked Questions
What is the hazard classification of Mirror Lake Dam?
Mirror 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 Mirror Lake Dam?
Mirror Lake Dam is owned by Township of Pemberton (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Mirror Lake Dam built?
Mirror Lake Dam was completed in 1880, making it 146 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 Mirror Lake Dam?
Mirror 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 Mirror Lake Dam?
Mirror Lake Dam has a dam height of 18 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 Mirror Lake Dam last inspected?
Mirror Lake Dam was last inspected on April 8, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.