Oswego Lake Dam
Key Takeaway
Oswego Lake Dam is classified as significant hazard in Oregon. It was completed in 1921 and is 105 years old. Its primary use is hydroelectric. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 32 ft (taller than 63.9% in OR) |
| Dam Length | 120 ft |
| Dam Type | Concrete |
| Max Storage | 7.0K acre-ft |
| Normal Storage | 9.8K acre-ft |
| Surface Area | 433 acres |
| Drainage Area | 6 sq mi |
| Max Discharge | 1,400 cfs |
| Year Completed | 1921 (105 years old) |
| NID ID | OR00237 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
LAKE OSWEGO CORPORATION
Private
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High Hazard 30 ftFrequently Asked Questions
What is the hazard classification of Oswego Lake Dam?
Oswego Lake Dam is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Oswego Lake Dam?
Oswego Lake Dam is owned by LAKE OSWEGO CORPORATION (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Oswego Lake Dam built?
Oswego Lake Dam was completed in 1921, making it 105 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 Oswego Lake Dam?
Oswego Lake Dam 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 Oswego Lake Dam?
Oswego Lake Dam has a dam height of 32 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 Oswego Lake Dam last inspected?
Oswego Lake Dam was last inspected on November 19, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.