Lake Ossawinnamakee
Key Takeaway
Lake Ossawinnamakee is classified as low hazard in Minnesota. It was completed in 1937 and is 89 years old. Its primary use is recreation.
Physical Details
| Dam Height | 10 ft (taller than 30.9% in MN) |
| Dam Length | 48 ft |
| Dam Type | Gravity |
| Max Storage | 10.7K acre-ft |
| Normal Storage | 8.8K acre-ft |
| Surface Area | 662 acres |
| Drainage Area | 47 sq mi |
| Max Discharge | 1,235 cfs |
| Year Completed | 1937 (89 years old) |
| Year Modified | 1962 |
| NID ID | MN00047 |
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
MNDNR
State Government
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Low Hazard 6 ftFrequently Asked Questions
What is the hazard classification of Lake Ossawinnamakee?
Lake Ossawinnamakee 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 Lake Ossawinnamakee?
Lake Ossawinnamakee is owned by MNDNR (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lake Ossawinnamakee built?
Lake Ossawinnamakee was completed in 1937, making it 89 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 Lake Ossawinnamakee?
Lake Ossawinnamakee serves the following purposes: Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Lake Ossawinnamakee?
Lake Ossawinnamakee has a dam height of 10 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 Lake Ossawinnamakee last inspected?
Lake Ossawinnamakee was last inspected on June 29, 2018. Inspection dates indicate when a formal review occurred, not the results of that inspection.