Lower Salmon
Key Takeaway
Lower Salmon is classified as high hazard in Idaho. It was completed in 1949 and is 77 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 | 1,200 ft |
| Dam Type | Concrete |
| Max Storage | 10.9K acre-ft |
| Normal Storage | 10.9K acre-ft |
| Surface Area | 748 acres |
| Drainage Area | 1,965 sq mi |
| Max Discharge | 72,000 cfs |
| Year Completed | 1949 (77 years old) |
| NID ID | ID00052 |
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
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High Hazard 140 ftFrequently Asked Questions
What is the hazard classification of Lower Salmon?
Lower Salmon 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 Lower Salmon?
Lower Salmon is owned by Idaho Power Company (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lower Salmon built?
Lower Salmon was completed in 1949, making it 77 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 Lower Salmon?
Lower Salmon 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 Lower Salmon?
Lower Salmon 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 Lower Salmon last inspected?
Lower Salmon was last inspected on September 22, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.