South Zumbro Wr-4
Key Takeaway
South Zumbro Wr-4 is classified as high hazard in Minnesota. It was completed in 1988 and is 38 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 | 21 ft (taller than 63.7% in MN) |
| Dam Length | 1,100 ft |
| Dam Type | Earth |
| Max Storage | 968 acre-ft |
| Normal Storage | 331 acre-ft |
| Surface Area | 40 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 140 cfs |
| Year Completed | 1988 (38 years old) |
| NID ID | MN00991 |
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 Rochester
Local Government
Nearby Dams
South Zumbro Wr-6a
Olmsted, MN
High Hazard 56 ftSilver Lake
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Significant Hazard 18 ftMayowood Lake
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Low Hazard 20 ftGlen Herman Stabilizer
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Low Hazard 26 ftSouth Zumbro Sr-2
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High Hazard 45 ftSouth Zumbro Br-1
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High Hazard 61 ftSouth Zumbro Kr-6
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High Hazard 31 ftSimonson Detention
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Low Hazard 27 ftFrequently Asked Questions
What is the hazard classification of South Zumbro Wr-4?
South Zumbro Wr-4 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 South Zumbro Wr-4?
South Zumbro Wr-4 is owned by City of Rochester (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was South Zumbro Wr-4 built?
South Zumbro Wr-4 was completed in 1988, making it 38 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 South Zumbro Wr-4?
South Zumbro Wr-4 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 South Zumbro Wr-4?
South Zumbro Wr-4 has a dam height of 21 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 South Zumbro Wr-4 last inspected?
South Zumbro Wr-4 was last inspected on May 10, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.