Grand Lake (Matagamon)
Key Takeaway
Grand Lake (Matagamon) is classified as high hazard in Maine. It was completed in 1941 and is 85 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 | 25 ft (taller than 83.1% in ME) |
| Dam Length | 218 ft |
| Dam Type | Concrete |
| Max Storage | 45.8K acre-ft |
| Normal Storage | 41.4K acre-ft |
| Surface Area | 4,200 acres |
| Drainage Area | 485 sq mi |
| Year Completed | 1941 (85 years old) |
| Year Modified | 1959 |
| NID ID | ME00180 |
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
Mattagamon Lake Association
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Grand Lake (Matagamon)?
Grand Lake (Matagamon) 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 Grand Lake (Matagamon)?
Grand Lake (Matagamon) is owned by Mattagamon Lake Association (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Grand Lake (Matagamon) built?
Grand Lake (Matagamon) was completed in 1941, making it 85 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 Grand Lake (Matagamon)?
Grand Lake (Matagamon) serves the following purposes: Hydroelectric, Other. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Grand Lake (Matagamon)?
Grand Lake (Matagamon) 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 Grand Lake (Matagamon) last inspected?
Grand Lake (Matagamon) was last inspected on November 12, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.