Johnson Millpond Dam
Key Takeaway
Johnson Millpond Dam is classified as significant hazard in Connecticut. It was completed in 1880 and is 146 years old. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 25 ft (taller than 83% in CT) |
| Dam Length | 415 ft |
| Dam Type | Earth |
| Max Storage | 143 acre-ft |
| Normal Storage | 143 acre-ft |
| Surface Area | 14 acres |
| Drainage Area | 16 sq mi |
| Max Discharge | 2,544 cfs |
| Year Completed | 1880 (146 years old) |
| NID ID | CT00353 |
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
Rajon Realty Corporation
Private
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What is the hazard classification of Johnson Millpond Dam?
Johnson Millpond 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 Johnson Millpond Dam?
Johnson Millpond Dam is owned by Rajon Realty Corporation (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Johnson Millpond Dam built?
Johnson Millpond Dam was completed in 1880, making it 146 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 Johnson Millpond Dam?
Johnson Millpond 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 Johnson Millpond Dam?
Johnson Millpond Dam has a dam height of 25 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 Johnson Millpond Dam last inspected?
Johnson Millpond Dam was last inspected on December 22, 2017. Inspection dates indicate when a formal review occurred, not the results of that inspection.