Cascade
Key Takeaway
Cascade is classified as high hazard in Idaho. It was completed in 1948 and is 78 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 | 110 ft (taller than 93.8% in ID) |
| Dam Length | 785 ft |
| Dam Type | Rockfill |
| Max Storage | 860.0K acre-ft |
| Normal Storage | 703.0K acre-ft |
| Surface Area | 27,700 acres |
| Drainage Area | 2,230 sq mi |
| Max Discharge | 12,500 cfs |
| Year Completed | 1948 (78 years old) |
| NID ID | ID00283 |
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
RECLAMATION
Federal Government
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Low Hazard 29 ftFrequently Asked Questions
What is the hazard classification of Cascade?
Cascade 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 Cascade?
Cascade is owned by RECLAMATION (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Cascade built?
Cascade was completed in 1948, making it 78 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 Cascade?
Cascade serves the following purposes: Hydroelectric, Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Cascade?
Cascade has a dam height of 110 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 Cascade last inspected?
Cascade was last inspected on October 28, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.