Grandin Reservoir Dam
Key Takeaway
Grandin Reservoir Dam is classified as high hazard in Massachusetts. It was completed in 1935 and is 91 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 | 37 ft (taller than 91.3% in MA) |
| Dam Length | 242 ft |
| Dam Type | Earth |
| Max Storage | 104 acre-ft |
| Normal Storage | 86 acre-ft |
| Surface Area | 0 acres |
| Drainage Area | 1 sq mi |
| Year Completed | 1935 (91 years old) |
| NID ID | MA00051 |
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
NORTHFIELD MOUNT HERMON SCHOOL
Private
Nearby Dams
Stevens Swamp Dam
Franklin, MA
Low Hazard 15 ftNelson Mills Pond Dam
Franklin, MA
Significant Hazard 27 ftLower Robertson
Cheshire, NH
Low Hazard 18 ftAshuelot Paper Mill Dam
Cheshire, NH
Low Hazard 18 ftVernon Fish Hatchery Pond
Windham, VT
Low Hazard 19 ftPaper Mills Holding Pond Dam
Cheshire, NH
Significant Hazard 20 ftFiske Mill Hydro Dam
Cheshire, NH
Low Hazard 20 ftPisgah Reservoir Dam
Cheshire, NH
High Hazard 33 ftFrequently Asked Questions
What is the hazard classification of Grandin Reservoir Dam?
Grandin 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 Grandin Reservoir Dam?
Grandin Reservoir Dam is owned by NORTHFIELD MOUNT HERMON SCHOOL (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Grandin Reservoir Dam built?
Grandin Reservoir Dam was completed in 1935, making it 91 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 Grandin Reservoir Dam?
Grandin 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 Grandin Reservoir Dam?
Grandin Reservoir Dam has a dam height of 37 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 Grandin Reservoir Dam last inspected?
Grandin Reservoir Dam was last inspected on May 24, 2018. Inspection dates indicate when a formal review occurred, not the results of that inspection.