Long Tom
Key Takeaway
Long Tom is classified as significant hazard in Idaho. It was completed in 1906 and is 120 years old. Its primary use is irrigation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 60 ft (taller than 83.3% in ID) |
| Dam Length | 450 ft |
| Normal Storage | 3.6K acre-ft |
| Surface Area | 158 acres |
| Drainage Area | 27 sq mi |
| Max Discharge | 450 cfs |
| Year Completed | 1906 (120 years old) |
| NID ID | ID00103 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Long Tom?
Long Tom is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Long Tom?
Long Tom is owned by information not available (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Long Tom built?
Long Tom 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 Long Tom?
Long Tom 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 Long Tom?
Long Tom has a dam height of 60 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 Long Tom last inspected?
Long Tom was last inspected on May 10, 2018. Inspection dates indicate when a formal review occurred, not the results of that inspection.