North Grosvenordale Dam
Key Takeaway
North Grosvenordale Dam is classified as high hazard in Connecticut. It was completed in 1900 and is 126 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 | 23 ft (taller than 80% in CT) |
| Dam Length | 380 ft |
| Dam Type | Earth |
| Max Storage | 840 acre-ft |
| Normal Storage | 540 acre-ft |
| Surface Area | 60 acres |
| Drainage Area | 99 sq mi |
| Max Discharge | 4,950 cfs |
| Year Completed | 1900 (126 years old) |
| Year Modified | 1997 |
| NID ID | CT00183 |
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
929 Riverside Drive LLC;Windham North Properties LLC
Private
Nearby Dams
Wilsonville Aka Langers Pond Dam
Windham, CT
Significant Hazard 12 ftBelden Dam
Windham, CT
Significant Hazard 10 ftWelch Pond Dam
Windham, CT
Significant Hazard 4 ftRomanek Pond Dam
Windham, CT
Significant Hazard 10 ftCoderre Pond Dam
Windham, CT
Significant Hazard 8 ftPerryville Pond Dam
Worcester, MA
Significant Hazard 13 ftCarpenter Pond Dam
Worcester, MA
Significant Hazard 8 ftStocking Mill Dam
Worcester, MA
Significant Hazard 8 ftFrequently Asked Questions
What is the hazard classification of North Grosvenordale Dam?
North Grosvenordale 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 North Grosvenordale Dam?
North Grosvenordale Dam is owned by 929 Riverside Drive LLC;Windham North Properties LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was North Grosvenordale Dam built?
North Grosvenordale Dam was completed in 1900, making it 126 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 North Grosvenordale Dam?
North Grosvenordale 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 North Grosvenordale Dam?
North Grosvenordale Dam has a dam height of 23 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 North Grosvenordale Dam last inspected?
North Grosvenordale Dam was last inspected on July 31, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.