North Twin
Key Takeaway
North Twin is classified as high hazard in Maine. It was completed in 1934 and is 92 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 | 35 ft (taller than 91.5% in ME) |
| Dam Length | 1,051 ft |
| Dam Type | Earth |
| Max Storage | 346.0K acre-ft |
| Normal Storage | 346.0K acre-ft |
| Surface Area | 17,790 acres |
| Drainage Area | 1,877 sq mi |
| Max Discharge | 72,000 cfs |
| Year Completed | 1934 (92 years old) |
| NID ID | ME00203 |
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
Not Listed
Nearby Dams
North Twin - Dike 1
Penobscot, ME
Significant Hazard 11 ftNorth Twin - Dike 2
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Significant Hazard 11 ftNorth Twin - Dike 3
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Significant Hazard 15 ftNorth Twin - Dike 4
Penobscot, ME
Significant Hazard 11 ftNorth Twin - Dike 5
Penobscot, ME
Significant Hazard 11 ftStone Dam - Dike 3
Penobscot, ME
Low Hazard 10 ftStone Dam
Penobscot, ME
High Hazard 27 ftStone Dam - Dike 2
Penobscot, ME
Low Hazard 10 ftFrequently Asked Questions
What is the hazard classification of North Twin?
North Twin 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 North Twin?
North Twin is owned by information not available (Not Listed). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was North Twin built?
North Twin was completed in 1934, making it 92 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 North Twin?
North Twin serves the following purposes: Hydroelectric, Navigation, Fish And Wildlife Pond, Recreation, Water Supply, Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is North Twin?
North Twin has a dam height of 35 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 North Twin last inspected?
North Twin was last inspected on August 10, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.