John C Boyle
Key Takeaway
John C Boyle is classified as high hazard in Oregon. It was completed in 1958 and is 68 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 | 68 ft (taller than 90.7% in OR) |
| Dam Length | 693 ft |
| Dam Type | Gravity |
| Max Storage | 3.4K acre-ft |
| Normal Storage | 3.4K acre-ft |
| Surface Area | 420 acres |
| Drainage Area | 4,080 sq mi |
| Max Discharge | 31,500 cfs |
| Year Completed | 1958 (68 years old) |
| NID ID | OR00559 |
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
PacifiCorp
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of John C Boyle?
John C Boyle 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 John C Boyle?
John C Boyle is owned by PacifiCorp (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was John C Boyle built?
John C Boyle was completed in 1958, making it 68 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 John C Boyle?
John C Boyle 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 John C Boyle?
John C Boyle has a dam height of 68 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 John C Boyle last inspected?
John C Boyle was last inspected on May 10, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.