Upper Mianus River Dam
Key Takeaway
Upper Mianus River Dam is classified as significant hazard in Connecticut. It was completed in 1930 and is 96 years old. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 3 ft (taller than 0.7% in CT) |
| Dam Length | 60 ft |
| Dam Type | Masonry |
| Max Storage | 72 acre-ft |
| Normal Storage | 72 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 70 sq mi |
| Max Discharge | 810 cfs |
| Year Completed | 1930 (96 years old) |
| NID ID | CT01703 |
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
Ruth Spelke Est
Private
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Significant Hazard 10 ftFrequently Asked Questions
What is the hazard classification of Upper Mianus River Dam?
Upper Mianus River 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 Upper Mianus River Dam?
Upper Mianus River Dam is owned by Ruth Spelke Est (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Upper Mianus River Dam built?
Upper Mianus River Dam was completed in 1930, making it 96 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 Upper Mianus River Dam?
Upper Mianus River 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 Upper Mianus River Dam?
Upper Mianus River Dam has a dam height of 3 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.