Lake Winthrop Dam
Key Takeaway
Lake Winthrop Dam is classified as significant hazard in Massachusetts. It was completed in 1966 and is 60 years old. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 5 ft (taller than 0.5% in MA) |
| Dam Length | 300 ft |
| Dam Type | Earth |
| Max Storage | 405 acre-ft |
| Normal Storage | 405 acre-ft |
| Surface Area | 131 acres |
| Drainage Area | 2 sq mi |
| Year Completed | 1966 (60 years old) |
| NID ID | MA02949 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
TOWN OF HOLLISTON, BOARD OF SELECTMEN
Local Government
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Significant Hazard 12 ftFrequently Asked Questions
What is the hazard classification of Lake Winthrop Dam?
Lake Winthrop Dam is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Lake Winthrop Dam?
Lake Winthrop Dam is owned by TOWN OF HOLLISTON, BOARD OF SELECTMEN (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lake Winthrop Dam built?
Lake Winthrop Dam was completed in 1966, making it 60 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 Lake Winthrop Dam?
Lake Winthrop 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 Lake Winthrop Dam?
Lake Winthrop Dam has a dam height of 5 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 Lake Winthrop Dam last inspected?
Lake Winthrop Dam was last inspected on September 6, 2017. Inspection dates indicate when a formal review occurred, not the results of that inspection.