Henrys Lake
Key Takeaway
Henrys Lake is classified as high hazard in Idaho. It was completed in 1923 and is 103 years old. Its primary use is other. 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 | 25 ft (taller than 43.7% in ID) |
| Dam Length | 408 ft |
| Normal Storage | 58.7K acre-ft |
| Surface Area | 6,050 acres |
| Drainage Area | 93 sq mi |
| Max Discharge | 1,175 cfs |
| Year Completed | 1923 (103 years old) |
| Year Modified | 1986 |
| NID ID | ID00008 |
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
Private
Frequently Asked Questions
What is the hazard classification of Henrys Lake?
Henrys Lake 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 Henrys Lake?
Henrys Lake is owned by information not available (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Henrys Lake built?
Henrys Lake was completed in 1923, making it 103 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 Henrys Lake?
Henrys Lake serves the following purposes: Other. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Henrys Lake?
Henrys Lake has a dam height of 25 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 Henrys Lake last inspected?
Henrys Lake was last inspected on October 8, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.