Reservoir A
Key Takeaway
Reservoir A is classified as high hazard in Idaho. It was completed in 1906 and is 120 years old. Its primary use is irrigation. 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 | 61 ft (taller than 84.1% in ID) |
| Dam Length | 2,200 ft |
| Dam Type | Earth |
| Max Storage | 3.3K acre-ft |
| Normal Storage | 3.3K acre-ft |
| Surface Area | 155 acres |
| Drainage Area | 1 sq mi |
| Year Completed | 1906 (120 years old) |
| NID ID | ID00261 |
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
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Reservoir A?
Reservoir A 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 Reservoir A?
Reservoir A is owned by RECLAMATION (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Reservoir A built?
Reservoir A was completed in 1906, making it 120 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 Reservoir A?
Reservoir A serves the following purposes: Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Reservoir A?
Reservoir A has a dam height of 61 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 Reservoir A last inspected?
Reservoir A was last inspected on June 30, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.