Granville Reservoir Dam
Key Takeaway
Granville Reservoir Dam is classified as high hazard in Massachusetts. It was completed in 1930 and is 96 years old. Its primary use is water supply. 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 | 85 ft (taller than 98.7% in MA) |
| Dam Length | 850 ft |
| Dam Type | Earth |
| Max Storage | 2.4K acre-ft |
| Normal Storage | 1.7K acre-ft |
| Surface Area | 77 acres |
| Drainage Area | 5 sq mi |
| Year Completed | 1930 (96 years old) |
| NID ID | MA00707 |
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
CITY OF WESTFIELD, WATER RESOURCES DEPARTMENT
Local Government
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Significant Hazard 10 ftFrequently Asked Questions
What is the hazard classification of Granville Reservoir Dam?
Granville Reservoir 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 Granville Reservoir Dam?
Granville Reservoir Dam is owned by CITY OF WESTFIELD, WATER RESOURCES DEPARTMENT (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Granville Reservoir Dam built?
Granville Reservoir Dam was completed in 1930, making it 96 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 Granville Reservoir Dam?
Granville Reservoir Dam serves the following purposes: Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Granville Reservoir Dam?
Granville Reservoir Dam has a dam height of 85 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 Granville Reservoir Dam last inspected?
Granville Reservoir Dam was last inspected on December 1, 2016. Inspection dates indicate when a formal review occurred, not the results of that inspection.