Niemi No.4
Key Takeaway
Niemi No.4 is classified as significant hazard in South Dakota. It was completed in 1954 and is 72 years old. Its primary use is fire protection. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 19 ft (taller than 29.5% in SD) |
| Dam Length | 300 ft |
| Dam Type | Earth |
| Max Storage | 61 acre-ft |
| Normal Storage | 48 acre-ft |
| Max Discharge | 630 cfs |
| Year Completed | 1954 (72 years old) |
| NID ID | SD00623 |
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
JOHN NIEMI
Private
Nearby Dams
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Low Hazard 36 ftFrequently Asked Questions
What is the hazard classification of Niemi No.4?
Niemi No.4 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 Niemi No.4?
Niemi No.4 is owned by JOHN NIEMI (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Niemi No.4 built?
Niemi No.4 was completed in 1954, making it 72 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 Niemi No.4?
Niemi No.4 serves the following purposes: Fire Protection, Stock, Or Small Fish Pond. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Niemi No.4?
Niemi No.4 has a dam height of 19 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.