Long Pond Dam
Key Takeaway
Long Pond Dam is classified as low hazard in Massachusetts. It was completed in 1900 and is 126 years old. Its primary use is recreation.
Physical Details
| Dam Height | 8 ft (taller than 6.7% in MA) |
| Dam Length | 190 ft |
| Dam Type | Gravity |
| Max Storage | 330 acre-ft |
| Normal Storage | 150 acre-ft |
| Surface Area | 60 acres |
| Drainage Area | 1 sq mi |
| Year Completed | 1900 (126 years old) |
| NID ID | MA01220 |
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
TOWN OF AYER, DEPARTMENT OF PUBLIC WORKS
Local Government
Nearby Dams
Lower Long Pond Dam
Middlesex, MA
Low Hazard 8 ftUpper Flannagan Pond Dam
Middlesex, MA
Significant Hazard 9 ftBalch Pond Dike
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Significant Hazard 3 ftBalch Pond Dam
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Significant Hazard 12 ftLost Lake Dam
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High Hazard 10 ftPlow Shop Pond Dam
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Low Hazard 7 ftMill Pond Dam
Middlesex, MA
Low Hazard 16 ftMurray Printing Company Dam
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Significant Hazard 9 ftFrequently Asked Questions
What is the hazard classification of Long Pond Dam?
Long Pond 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 Long Pond Dam?
Long Pond Dam is owned by TOWN OF AYER, DEPARTMENT OF PUBLIC WORKS (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Long Pond Dam built?
Long Pond 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 Long Pond Dam?
Long Pond 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 Long Pond Dam?
Long Pond Dam has a dam height of 8 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 Long Pond Dam last inspected?
Long Pond Dam was last inspected on October 14, 2015. Inspection dates indicate when a formal review occurred, not the results of that inspection.