Powell
Key Takeaway
Powell is classified as high hazard in Montana. It was completed in 1981 and is 45 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 | 52 ft (taller than 97% in MT) |
| Dam Length | 1,250 ft |
| Dam Type | Earth |
| Max Storage | 250 acre-ft |
| Normal Storage | 230 acre-ft |
| Surface Area | 240 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 4,600 cfs |
| Year Completed | 1981 (45 years old) |
| NID ID | MT00043 |
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
STATE OF MONTANA, D.O.C.
State Government
Nearby Dams
Conleys Lake (Powell)
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High Hazard 25 ftTin Cup Lake (Powell)
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High Hazard 19 ftKerns Lake (Powell)
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High Hazard 26 ftTaylor, Upper
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High Hazard 43 ftRock Creek Lake Dam
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Low Hazard 25 ftRock Creek Lake
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Significant Hazard 30 ftHeapby Reservoir
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Low Hazard 15 ftFrequently Asked Questions
What is the hazard classification of Powell?
Powell 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 Powell?
Powell is owned by STATE OF MONTANA, D.O.C. (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Powell built?
Powell was completed in 1981, making it 45 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 Powell?
Powell 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 Powell?
Powell has a dam height of 52 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 Powell last inspected?
Powell was last inspected on June 25, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.