Mann Creek
Key Takeaway
Mann Creek is classified as high hazard in Idaho. It was completed in 1966 and is 60 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 | 148 ft (taller than 96.9% in ID) |
| Dam Length | 1,176 ft |
| Dam Type | Earth |
| Max Storage | 15.4K acre-ft |
| Normal Storage | 13.0K acre-ft |
| Surface Area | 283 acres |
| Drainage Area | 56 sq mi |
| Max Discharge | 3,885 cfs |
| Year Completed | 1966 (60 years old) |
| NID ID | ID00285 |
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
Fairchild No. 1 (Upper)
Washington, ID
High Hazard 78 ftBarton
Washington, ID
Significant Hazard 52 ftMonroe
Washington, ID
Low Hazard 36 ftJenkins Creek
Washington, ID
Low Hazard 41 ftFairchild No 2 (Lower)
Washington, ID
Significant Hazard 24 ftScott Creek
Washington, ID
Significant Hazard 20 ftFrequently Asked Questions
What is the hazard classification of Mann Creek?
Mann Creek 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 Mann Creek?
Mann Creek is owned by RECLAMATION (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Mann Creek built?
Mann Creek was completed in 1966, making it 60 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 Mann Creek?
Mann Creek 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 Mann Creek?
Mann Creek has a dam height of 148 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 Mann Creek last inspected?
Mann Creek was last inspected on July 2, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.