Lower Kohanza Lake Dam
Key Takeaway
Lower Kohanza Lake Dam is classified as high hazard in Connecticut. It was completed in 1860 and is 166 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 | 25 ft (taller than 83% in CT) |
| Dam Length | 625 ft |
| Dam Type | Earth |
| Max Storage | 100 acre-ft |
| Normal Storage | 55 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 296 cfs |
| Year Completed | 1860 (166 years old) |
| NID ID | CT00064 |
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
City of Danbury
Local Government
Nearby Dams
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Significant Hazard 19 ftFrequently Asked Questions
What is the hazard classification of Lower Kohanza Lake Dam?
Lower Kohanza Lake 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 Lower Kohanza Lake Dam?
Lower Kohanza Lake Dam is owned by City of Danbury (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lower Kohanza Lake Dam built?
Lower Kohanza Lake Dam was completed in 1860, making it 166 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 Lower Kohanza Lake Dam?
Lower Kohanza 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 Lower Kohanza Lake Dam?
Lower Kohanza Lake 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 Lower Kohanza Lake Dam last inspected?
Lower Kohanza Lake Dam was last inspected on October 22, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.