Portneuf
Key Takeaway
Portneuf is classified as high hazard in Idaho. It was completed in 1912 and is 114 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 | 55 ft (taller than 81.2% in ID) |
| Dam Length | 1,475 ft |
| Normal Storage | 20.5K acre-ft |
| Surface Area | 1,593 acres |
| Drainage Area | 97 sq mi |
| Max Discharge | 462 cfs |
| Year Completed | 1912 (114 years old) |
| Year Modified | 1949 |
| NID ID | ID00180 |
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
Frequently Asked Questions
What is the hazard classification of Portneuf?
Portneuf 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 Portneuf?
Portneuf is owned by information not available (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Portneuf built?
Portneuf was completed in 1912, making it 114 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 Portneuf?
Portneuf 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 Portneuf?
Portneuf has a dam height of 55 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 Portneuf last inspected?
Portneuf was last inspected on November 4, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.