Mallard
Key Takeaway
Mallard is classified as low hazard in South Dakota. It was completed in 1935 and is 91 years old. Its primary use is recreation.
Physical Details
| Dam Height | 25 ft (taller than 57.4% in SD) |
| Dam Length | 670 ft |
| Dam Type | Earth |
| Max Storage | 859 acre-ft |
| Normal Storage | 371 acre-ft |
| Surface Area | 46 acres |
| Drainage Area | 17 sq mi |
| Max Discharge | 3,500 cfs |
| Year Completed | 1935 (91 years old) |
| Year Modified | 1998 |
| NID ID | SD00737 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
S&PL
State Government
Nearby Dams
Gall Dam; Wesley
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Low Hazard 21 ftHerbert Stoick
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Significant Hazard 22 ftMcintosh Lake
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Significant Hazard 20 ftRobert Bubbers
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Low Hazard 34 ftHarold Arnold
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Low Hazard 17 ftFrequently Asked Questions
What is the hazard classification of Mallard?
Mallard is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Mallard?
Mallard is owned by S&PL (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Mallard built?
Mallard was completed in 1935, making it 91 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 Mallard?
Mallard serves the following purposes: Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Mallard?
Mallard has a dam height of 25 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 Mallard last inspected?
Mallard was last inspected on November 8, 2018. Inspection dates indicate when a formal review occurred, not the results of that inspection.