Garrison Dam
Key Takeaway
Garrison Dam is classified as high hazard in North Dakota. It was completed in 1953 and is 73 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 Length | 11,300 ft |
| Dam Type | Earth |
| Max Storage | 26.0M acre-ft |
| Normal Storage | 18.5M acre-ft |
| Surface Area | 133,000 acres |
| Drainage Area | 180,940 sq mi |
| Max Discharge | 827,000 cfs |
| Year Completed | 1953 (73 years old) |
| NID ID | ND00145 |
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
USACE - Omaha District
Federal Government
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Low Hazard 17 ftFrequently Asked Questions
What is the hazard classification of Garrison Dam?
Garrison 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 Garrison Dam?
Garrison Dam is owned by USACE - Omaha District (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Garrison Dam built?
Garrison Dam was completed in 1953, making it 73 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 Garrison Dam?
Garrison Dam serves the following purposes: Irrigation, Recreation, Flood Risk Reduction, Navigation, Hydroelectric. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Garrison Dam last inspected?
Garrison Dam was last inspected on June 30, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.