Rocky River Main Dam
Key Takeaway
Rocky River Main Dam is classified as high hazard in Connecticut. It was completed in 1929 and is 97 years old. Its primary use is hydroelectric. 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 | 107 ft (taller than 99% in CT) |
| Dam Length | 952 ft |
| Dam Type | Other |
| Max Storage | 172.0K acre-ft |
| Normal Storage | 158.2K acre-ft |
| Surface Area | 5,600 acres |
| Drainage Area | 40 sq mi |
| Max Discharge | 2,280 cfs |
| Year Completed | 1929 (97 years old) |
| NID ID | CT00224 |
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
FirstLight Power Services LLC
Public Utility
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What is the hazard classification of Rocky River Main Dam?
Rocky River Main 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 Rocky River Main Dam?
Rocky River Main Dam is owned by FirstLight Power Services LLC (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Rocky River Main Dam built?
Rocky River Main Dam was completed in 1929, making it 97 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 Rocky River Main Dam?
Rocky River Main Dam serves the following purposes: Hydroelectric, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Rocky River Main Dam?
Rocky River Main Dam has a dam height of 107 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 Rocky River Main Dam last inspected?
Rocky River Main Dam was last inspected on July 25, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.