Walnut Grove
Key Takeaway
Walnut Grove is classified as significant hazard in Minnesota. It was completed in 1979 and is 47 years old. Its primary use is flood risk reduction. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 54 ft (taller than 97.2% in MN) |
| Dam Length | 1,275 ft |
| Dam Type | Earth |
| Max Storage | 1.3K acre-ft |
| Normal Storage | 231 acre-ft |
| Surface Area | 22 acres |
| Drainage Area | 7 sq mi |
| Max Discharge | 6,057 cfs |
| Year Completed | 1979 (47 years old) |
| NID ID | MN00728 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
County of Redwood
Local Government
Nearby Dams
Holly 2
Murray, MN
Low Hazard 29 ftSpringdale 21
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Significant Hazard 23 ftDuncan Avenue
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Low Hazard 26 ftHolly 10
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Low Hazard 35 ftAnn 6
Cottonwood, MN
Low Hazard 26 ftHolly 9
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Low Hazard 40 ftHolly 16
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Low Hazard 25 ftSpringdale 20
Redwood, MN
Low Hazard 23 ftFrequently Asked Questions
What is the hazard classification of Walnut Grove?
Walnut Grove is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Walnut Grove?
Walnut Grove is owned by County of Redwood (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Walnut Grove built?
Walnut Grove was completed in 1979, making it 47 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 Walnut Grove?
Walnut Grove 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 Walnut Grove?
Walnut Grove has a dam height of 54 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 Walnut Grove last inspected?
Walnut Grove was last inspected on May 10, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.