Gropps Lake Dam
Key Takeaway
Gropps Lake Dam is classified as low hazard in New Jersey. It was completed in 1900 and is 126 years old. Its primary use is recreation.
Physical Details
| Dam Height | 25 ft (taller than 85% in NJ) |
| Dam Length | 485 ft |
| Dam Type | Earth |
| Max Storage | 549 acre-ft |
| Normal Storage | 211 acre-ft |
| Surface Area | 41 acres |
| Drainage Area | 8 sq mi |
| Max Discharge | 1,900 cfs |
| Year Completed | 1900 (126 years old) |
| NID ID | NJ00235 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Township of Hamilton
Local Government
Nearby Dams
Assunpink #8 Dam
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High Hazard 20 ftAssunpink #21 Dam
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High Hazard 25 ftColonial Lake Dam
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Low Hazard 12 ftCrystal Lake Dam
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Significant Hazard 13 ftAssunpink #20 Dam
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High Hazard 26 ftTrenton Reservoir Dam
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High Hazard 52 ftIndian Dam
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Significant Hazard 17 ftVan Sciver Lake
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Low Hazard 18 ftFrequently Asked Questions
What is the hazard classification of Gropps Lake Dam?
Gropps Lake Dam is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Gropps Lake Dam?
Gropps Lake Dam is owned by Township of Hamilton (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Gropps Lake Dam built?
Gropps Lake Dam was completed in 1900, making it 126 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 Gropps Lake Dam?
Gropps 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 Gropps Lake Dam?
Gropps Lake Dam has a dam height of 25 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 Gropps Lake Dam last inspected?
Gropps Lake Dam was last inspected on November 30, 2009. Inspection dates indicate when a formal review occurred, not the results of that inspection.