Canby R-4a
Key Takeaway
Canby R-4a is classified as high hazard in Minnesota. It was completed in 1982 and is 44 years old. Its primary use is flood risk reduction. 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 | 41 ft (taller than 94% in MN) |
| Dam Length | 1,200 ft |
| Dam Type | Earth |
| Max Storage | 770 acre-ft |
| Normal Storage | 82 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 10,000 cfs |
| Year Completed | 1982 (44 years old) |
| NID ID | MN01016 |
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
WD of Lac Qui Parle-Yellow Bank
Local Government
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Low Hazard 30 ftFrequently Asked Questions
What is the hazard classification of Canby R-4a?
Canby R-4a 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 Canby R-4a?
Canby R-4a is owned by WD of Lac Qui Parle-Yellow Bank (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Canby R-4a built?
Canby R-4a was completed in 1982, making it 44 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 Canby R-4a?
Canby R-4a serves the following purposes: Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Canby R-4a?
Canby R-4a has a dam height of 41 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 Canby R-4a last inspected?
Canby R-4a was last inspected on May 10, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.