Orono
Key Takeaway
Orono is classified as low hazard in Maine. It was completed in 1917 and is 109 years old. Its primary use is hydroelectric.
Physical Details
| Dam Height | 15 ft (taller than 51.7% in ME) |
| Dam Length | 1,178 ft |
| Dam Type | Concrete |
| Max Storage | 1.3K acre-ft |
| Normal Storage | 1.3K acre-ft |
| Surface Area | 175 acres |
| Drainage Area | 7,710 sq mi |
| Max Discharge | 48,000 cfs |
| Year Completed | 1917 (109 years old) |
| NID ID | ME00138 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Black Bear Hydro Partners, LLC, Black Bear Development Holdings, LLC & Black Bear SO, LLC
Private
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Low Hazard 8 ftFrequently Asked Questions
What is the hazard classification of Orono?
Orono is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Orono?
Orono is owned by Black Bear Hydro Partners, LLC, Black Bear Development Holdings, LLC & Black Bear SO, LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Orono built?
Orono was completed in 1917, making it 109 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 Orono?
Orono 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 Orono?
Orono has a dam height of 15 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 Orono last inspected?
Orono was last inspected on September 13, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.