Middle Dam
Key Takeaway
Middle Dam is classified as high hazard in Maine. It was completed in 1883 and is 143 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 | 22 ft (taller than 79.7% in ME) |
| Dam Length | 1,004 ft |
| Dam Type | Rockfill |
| Max Storage | 130.7K acre-ft |
| Normal Storage | 130.7K acre-ft |
| Surface Area | 7,470 acres |
| Drainage Area | 472 sq mi |
| Max Discharge | 25,773 cfs |
| Year Completed | 1883 (143 years old) |
| NID ID | ME00025 |
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
Brookfield Renewable Power LLC NYRO
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Middle Dam?
Middle 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 Middle Dam?
Middle Dam is owned by Brookfield Renewable Power LLC NYRO (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Middle Dam built?
Middle Dam was completed in 1883, making it 143 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 Middle Dam?
Middle Dam serves the following purposes: Hydroelectric. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Middle Dam?
Middle Dam has a dam height of 22 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 Middle Dam last inspected?
Middle Dam was last inspected on July 26, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.