Overflow Weir Dam
Key Takeaway
Overflow Weir Dam is classified as high hazard in New Jersey. It was completed in 1928 and is 98 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 | 30 ft (taller than 90.1% in NJ) |
| Dam Length | 552 ft |
| Dam Type | Concrete |
| Normal Storage | 29.0K acre-ft |
| Surface Area | 2,400 acres |
| Drainage Area | 90 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1928 (98 years old) |
| NID ID | NJ00214 |
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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What is the hazard classification of Overflow Weir Dam?
Overflow Weir 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 Overflow Weir Dam?
Overflow Weir 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 Overflow Weir Dam built?
Overflow Weir 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 Overflow Weir Dam?
Overflow Weir 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 Overflow Weir Dam?
Overflow Weir Dam has a dam height of 30 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 Overflow Weir Dam last inspected?
Overflow Weir Dam was last inspected on October 6, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.