W. Mann No.1
Key Takeaway
W. Mann No.1 is classified as low hazard in South Dakota. It was completed in 1948 and is 78 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 17 ft (taller than 20.2% in SD) |
| Dam Length | 540 ft |
| Dam Type | Earth |
| Max Storage | 228 acre-ft |
| Normal Storage | 62 acre-ft |
| Max Discharge | 10,000 cfs |
| Year Completed | 1948 (78 years old) |
| NID ID | SD00384 |
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
WILLIS MANN
Private
Nearby Dams
W. Mann No.2
Meade, SD
Low Hazard 16 ftHowie Dam
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High Hazard 22 ftD. Gifford No.1
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Low Hazard 22 ftW. Mann No.3
Meade, SD
Low Hazard 15 ftMiller Dam
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Low Hazard 24 ftJ. Huston
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Low Hazard 24 ftHale 1
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Significant Hazard 13 ftBlazek Dam
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Low Hazard 14 ftFrequently Asked Questions
What is the hazard classification of W. Mann No.1?
W. Mann No.1 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 W. Mann No.1?
W. Mann No.1 is owned by WILLIS MANN (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was W. Mann No.1 built?
W. Mann No.1 was completed in 1948, making it 78 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 W. Mann No.1?
W. Mann No.1 serves the following purposes: Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is W. Mann No.1?
W. Mann No.1 has a dam height of 17 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.