Great Stone
Key Takeaway
Great Stone is classified as low hazard in Massachusetts. It was completed in 1848 and is 178 years old. Its primary use is hydroelectric.
Physical Details
| Dam Height | 38 ft (taller than 91.8% in MA) |
| Dam Length | 943 ft |
| Dam Type | Masonry |
| Max Storage | 19.9K acre-ft |
| Normal Storage | 19.9K acre-ft |
| Surface Area | 655 acres |
| Drainage Area | 4,660 sq mi |
| Max Discharge | 128,000 cfs |
| Year Completed | 1848 (178 years old) |
| NID ID | MA00234 |
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
Lawrence Hydroelectric Associates
Private
Nearby Dams
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Significant Hazard 8 ftCochichewick River Dam
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Significant Hazard 23 ftOsgood Pond Dam
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Significant Hazard 28 ftHaggetts Pond Dam
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Significant Hazard 6 ftLake Cochichewick Outlet Dam
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High Hazard 13 ftBallardvale Dam
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Significant Hazard 14 ftFrequently Asked Questions
What is the hazard classification of Great Stone?
Great Stone 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 Great Stone?
Great Stone is owned by Lawrence Hydroelectric Associates (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Great Stone built?
Great Stone was completed in 1848, making it 178 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 Great Stone?
Great Stone serves the following purposes: Hydroelectric, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Great Stone?
Great Stone has a dam height of 38 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 Great Stone last inspected?
Great Stone was last inspected on June 15, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.