Lake Roslyn
Key Takeaway
Lake Roslyn is classified as significant hazard in Oregon. It was completed in 1959 and is 67 years old. Its primary use is hydroelectric. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 45 ft (taller than 80.5% in OR) |
| Dam Length | 8,000 ft |
| Dam Type | Earth |
| Max Storage | 2.0K acre-ft |
| Normal Storage | 2.0K acre-ft |
| Surface Area | 152 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 800 cfs |
| Year Completed | 1959 (67 years old) |
| NID ID | OR00543 |
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
PGE
Public Utility
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Low Hazard 20 ftFrequently Asked Questions
What is the hazard classification of Lake Roslyn?
Lake Roslyn 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 Lake Roslyn?
Lake Roslyn is owned by PGE (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lake Roslyn built?
Lake Roslyn was completed in 1959, making it 67 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 Roslyn?
Lake Roslyn 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 Lake Roslyn?
Lake Roslyn has a dam height of 45 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.