Rock Lake Dam
Key Takeaway
Rock Lake Dam is classified as significant hazard in Connecticut. It was completed in 1875 and is 151 years old. Its primary use is water supply. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 37 ft (taller than 92.6% in CT) |
| Dam Length | 250 ft |
| Dam Type | Earth |
| Max Storage | 290 acre-ft |
| Normal Storage | 310 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 415 cfs |
| Year Completed | 1875 (151 years old) |
| Year Modified | 1980 |
| NID ID | CT00216 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
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 15 ftFrequently Asked Questions
What is the hazard classification of Rock Lake Dam?
Rock Lake Dam is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Rock Lake Dam?
Rock Lake 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 Rock Lake Dam built?
Rock Lake Dam was completed in 1875, making it 151 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 Rock Lake Dam?
Rock Lake 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 Rock Lake Dam?
Rock Lake 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 Rock Lake Dam last inspected?
Rock Lake Dam was last inspected on May 29, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.