Graham Lake Dam
Key Takeaway
Graham Lake Dam is classified as high hazard in Maine. It was completed in 1924 and is 102 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 | 43 ft (taller than 94.5% in ME) |
| Dam Length | 630 ft |
| Dam Type | Concrete |
| Max Storage | 130.0K acre-ft |
| Normal Storage | 130.0K acre-ft |
| Surface Area | 10,300 acres |
| Drainage Area | 499 sq mi |
| Max Discharge | 24,000 cfs |
| Year Completed | 1924 (102 years old) |
| NID ID | ME00264 |
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
Black Bear Hydro Partners, LLC
Private
Nearby Dams
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Hancock, ME
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Low Hazard 11 ftFrequently Asked Questions
What is the hazard classification of Graham Lake Dam?
Graham 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 Graham Lake Dam?
Graham Lake Dam is owned by Black Bear Hydro Partners, LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Graham Lake Dam built?
Graham Lake Dam was completed in 1924, making it 102 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 Graham Lake Dam?
Graham Lake 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 Graham Lake Dam?
Graham Lake Dam has a dam height of 43 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 Graham Lake Dam last inspected?
Graham Lake Dam was last inspected on September 21, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.