Carlanna Lake
Key Takeaway
Carlanna Lake is classified as high hazard in Alaska. It was completed in 1975 and is 51 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 | 31 ft (taller than 56.5% in AK) |
| Dam Length | 340 ft |
| Dam Type | Buttress |
| Max Storage | 700 acre-ft |
| Normal Storage | 390 acre-ft |
| Surface Area | 32 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 4,700 cfs |
| Year Completed | 1975 (51 years old) |
| NID ID | AK00011 |
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 KETCHIKAN
Local Government
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Low Hazard 32 ftFrequently Asked Questions
What is the hazard classification of Carlanna Lake?
Carlanna Lake 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 Carlanna Lake?
Carlanna Lake is owned by CITY OF KETCHIKAN (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Carlanna Lake built?
Carlanna Lake was completed in 1975, making it 51 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 Carlanna Lake?
Carlanna Lake 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 Carlanna Lake?
Carlanna Lake has a dam height of 31 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 Carlanna Lake last inspected?
Carlanna Lake was last inspected on October 5, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.