South Norwalk Reservoir Dam
Key Takeaway
South Norwalk Reservoir Dam is classified as high hazard in Connecticut. It was completed in 1899 and is 127 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 | 36 ft (taller than 92.1% in CT) |
| Dam Length | 870 ft |
| Dam Type | Earth |
| Max Storage | 3.2K acre-ft |
| Normal Storage | 2.0K acre-ft |
| Surface Area | 155 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 2,700 cfs |
| Year Completed | 1899 (127 years old) |
| Year Modified | 1980 |
| NID ID | CT00212 |
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
South Norwalk Electric and Water
Public Utility
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Significant Hazard 10 ftFrequently Asked Questions
What is the hazard classification of South Norwalk Reservoir Dam?
South Norwalk 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 South Norwalk Reservoir Dam?
South Norwalk Reservoir Dam is owned by South Norwalk Electric and Water (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was South Norwalk Reservoir Dam built?
South Norwalk Reservoir Dam was completed in 1899, making it 127 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 South Norwalk Reservoir Dam?
South Norwalk 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 South Norwalk Reservoir Dam?
South Norwalk Reservoir Dam has a dam height of 36 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 South Norwalk Reservoir Dam last inspected?
South Norwalk Reservoir Dam was last inspected on July 19, 2017. Inspection dates indicate when a formal review occurred, not the results of that inspection.