Hemlock Reservoir Dam
Key Takeaway
Hemlock Reservoir Dam is classified as high hazard in Connecticut. It was completed in 1914 and is 112 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 | 75 ft (taller than 97.8% in CT) |
| Dam Length | 1,100 ft |
| Dam Type | Earth |
| Max Storage | 13.3K acre-ft |
| Normal Storage | 11.0K acre-ft |
| Surface Area | 437 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 4,670 cfs |
| Year Completed | 1914 (112 years old) |
| NID ID | CT00018 |
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
Aquarion Water Company of Connecticut
Public Utility
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High Hazard 123 ftFrequently Asked Questions
What is the hazard classification of Hemlock Reservoir Dam?
Hemlock 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 Hemlock Reservoir Dam?
Hemlock Reservoir Dam is owned by Aquarion Water Company of Connecticut (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Hemlock Reservoir Dam built?
Hemlock Reservoir Dam was completed in 1914, making it 112 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 Hemlock Reservoir Dam?
Hemlock 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 Hemlock Reservoir Dam?
Hemlock Reservoir Dam has a dam height of 75 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 Hemlock Reservoir Dam last inspected?
Hemlock Reservoir Dam was last inspected on August 6, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.