Big Casino Creek Dam
Key Takeaway
Big Casino Creek Dam is classified as high hazard in Montana. It was completed in 1976 and is 50 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 | 68 ft (taller than 98.2% in MT) |
| Dam Length | 1,056 ft |
| Dam Type | Earth |
| Max Storage | 2.1K acre-ft |
| Normal Storage | 124 acre-ft |
| Surface Area | 72 acres |
| Drainage Area | 20 sq mi |
| Max Discharge | 16,000 cfs |
| Year Completed | 1976 (50 years old) |
| NID ID | MT01569 |
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
CITY OF LEWISTOWN
Local Government
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High Hazard 62 ftFrequently Asked Questions
What is the hazard classification of Big Casino Creek Dam?
Big Casino Creek Dam 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 Big Casino Creek Dam?
Big Casino Creek Dam is owned by CITY OF LEWISTOWN (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Big Casino Creek Dam built?
Big Casino Creek Dam was completed in 1976, making it 50 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 Big Casino Creek Dam?
Big Casino Creek Dam serves the following purposes: Irrigation, Recreation, Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Big Casino Creek Dam?
Big Casino Creek Dam has a dam height of 68 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 Big Casino Creek Dam last inspected?
Big Casino Creek Dam was last inspected on June 15, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.