Lower Long Pond Dam

TRIBUTARY OF LONG POND BROOK· Middlesex, Massachusetts· Built 1961· Earth· 8 ft tall
Low Hazard Other Private

Key Takeaway

Lower Long Pond Dam is classified as low hazard in Massachusetts. It was completed in 1961 and is 65 years old. Its primary use is other.

Physical Details

Dam Height 8 ft (taller than 6.7% in MA)
Dam Length150 ft
Dam TypeEarth
Max Storage103 acre-ft
Normal Storage22 acre-ft
Year Completed1961 (65 years old)
NID IDMA01183

Safety Information

Low Hazard

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?

Emergency Action Plan: No
Last Inspection: July 15, 2009
State Regulated: Yes
Regulatory Agency: DEPARTMENT OF CONSERVATION AND RECREATION

Ownership

SANDY POND REAL ESTATE

Private

Nearby Dams

Long Pond Dam

Middlesex, MA

Low Hazard 8 ft

Upper Flannagan Pond Dam

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Significant Hazard 9 ft

Balch Pond Dike

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Significant Hazard 3 ft

Balch Pond Dam

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Significant Hazard 12 ft

Lost Lake Dam

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High Hazard 10 ft

Plow Shop Pond Dam

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Low Hazard 7 ft

Mill Pond Dam

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Low Hazard 16 ft

Murray Printing Company Dam

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Significant Hazard 9 ft

Frequently Asked Questions

What is the hazard classification of Lower Long Pond Dam?

Lower 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 Lower Long Pond Dam?

Lower Long Pond Dam is owned by SANDY POND REAL ESTATE (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Lower Long Pond Dam built?

Lower Long Pond Dam was completed in 1961, making it 65 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 Lower Long Pond Dam?

Lower Long Pond Dam serves the following purposes: Other. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is Lower Long Pond Dam?

Lower 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 Lower Long Pond Dam last inspected?

Lower Long Pond Dam was last inspected on July 15, 2009. Inspection dates indicate when a formal review occurred, not the results of that inspection.

Data from the National Inventory of Dams (NID) maintained by the US Army Corps of Engineers. Dam conditions may have changed since the last update. This site is not affiliated with USACE. Do not use for emergency planning — contact your local dam safety program.