Lost Lake Dam
Key Takeaway
Lost Lake Dam is classified as high hazard in Massachusetts. It was completed in 1910 and is 116 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 | 10 ft (taller than 18% in MA) |
| Dam Length | 100 ft |
| Dam Type | Concrete |
| Max Storage | 2.0K acre-ft |
| Normal Storage | 1.5K acre-ft |
| Surface Area | 300 acres |
| Drainage Area | 5 sq mi |
| Year Completed | 1910 (116 years old) |
| NID ID | MA00808 |
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
TOWN OF GROTON, HIGHWAY DEPARTMENT
Local Government
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What is the hazard classification of Lost Lake Dam?
Lost 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 Lost Lake Dam?
Lost Lake Dam is owned by TOWN OF GROTON, HIGHWAY DEPARTMENT (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lost Lake Dam built?
Lost Lake Dam was completed in 1910, making it 116 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 Lost Lake Dam?
Lost 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 Lost Lake Dam?
Lost Lake Dam has a dam height of 10 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 Lost Lake Dam last inspected?
Lost Lake Dam was last inspected on April 20, 2016. Inspection dates indicate when a formal review occurred, not the results of that inspection.