Hells Canyon
Key Takeaway
Hells Canyon is classified as high hazard in Idaho. It was completed in 1967 and is 59 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 | 323 ft (taller than 98.7% in ID) |
| Dam Length | 910 ft |
| Dam Type | Gravity |
| Max Storage | 188.0K acre-ft |
| Normal Storage | 170.0K acre-ft |
| Surface Area | 2,430 acres |
| Drainage Area | 73,300 sq mi |
| Max Discharge | 300,000 cfs |
| Year Completed | 1967 (59 years old) |
| NID ID | ID00055 |
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
Idaho Power Company
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Hells Canyon?
Hells Canyon 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 Hells Canyon?
Hells Canyon is owned by Idaho Power Company (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Hells Canyon built?
Hells Canyon was completed in 1967, making it 59 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 Hells Canyon?
Hells Canyon serves the following purposes: Hydroelectric, Navigation, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Hells Canyon?
Hells Canyon has a dam height of 323 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 Hells Canyon last inspected?
Hells Canyon was last inspected on September 28, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.