Strong Arm No 1 (Upper)
Key Takeaway
Strong Arm No 1 (Upper) is classified as high hazard in Idaho. It was completed in 1887 and is 139 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 | 39 ft (taller than 69.9% in ID) |
| Dam Length | 480 ft |
| Normal Storage | 1.7K acre-ft |
| Surface Area | 131 acres |
| Drainage Area | 30 sq mi |
| Max Discharge | 360 cfs |
| Year Completed | 1887 (139 years old) |
| Year Modified | 1951 |
| NID ID | ID00228 |
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
Nearby Dams
Casperson
Franklin, ID
Low Hazard 22 ftCondie
Franklin, ID
Significant Hazard 41 ftStrong Arm No 2 (Lower)
Franklin, ID
Significant Hazard 27 ftWinder
Franklin, ID
Significant Hazard 57 ftCurrent Creek
Bannock, ID
Significant Hazard 49 ftFoster
Franklin, ID
High Hazard 70 ftGlendale
Franklin, ID
High Hazard 73 ftOneida Main
Franklin, ID
High Hazard 114 ftFrequently Asked Questions
What is the hazard classification of Strong Arm No 1 (Upper)?
Strong Arm No 1 (Upper) 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 Strong Arm No 1 (Upper)?
Strong Arm No 1 (Upper) is owned by information not available (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Strong Arm No 1 (Upper) built?
Strong Arm No 1 (Upper) was completed in 1887, making it 139 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 Strong Arm No 1 (Upper)?
Strong Arm No 1 (Upper) 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 Strong Arm No 1 (Upper)?
Strong Arm No 1 (Upper) has a dam height of 39 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 Strong Arm No 1 (Upper) last inspected?
Strong Arm No 1 (Upper) was last inspected on April 4, 2018. Inspection dates indicate when a formal review occurred, not the results of that inspection.