Reliance Dam
Key Takeaway
Reliance Dam is classified as significant hazard in South Dakota. It was completed in 1935 and is 91 years old. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 16 ft (taller than 15.7% in SD) |
| Dam Length | 525 ft |
| Dam Type | Earth |
| Max Storage | 530 acre-ft |
| Normal Storage | 235 acre-ft |
| Surface Area | 46 acres |
| Drainage Area | 15 sq mi |
| Max Discharge | 1,425 cfs |
| Year Completed | 1935 (91 years old) |
| NID ID | SD02168 |
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
State Government
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Low Hazard 12 ftFrequently Asked Questions
What is the hazard classification of Reliance Dam?
Reliance Dam 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 Reliance Dam?
Reliance Dam is owned by information not available (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Reliance Dam built?
Reliance Dam 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 Reliance Dam?
Reliance Dam 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 Reliance Dam?
Reliance Dam has a dam height of 16 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 Reliance Dam last inspected?
Reliance Dam was last inspected on November 5, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.