Standing Rock No. 1
Key Takeaway
Standing Rock No. 1 is classified as high hazard in South Dakota. It was completed in 1991 and is 35 years old. Its primary use is irrigation. 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 Length | 604 ft |
| Dam Type | Earth |
| Normal Storage | 315 acre-ft |
| Year Completed | 1991 (35 years old) |
| NID ID | SD00734 |
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
BIA
Federal Government
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Significant Hazard 27 ftFrequently Asked Questions
What is the hazard classification of Standing Rock No. 1?
Standing Rock No. 1 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 Standing Rock No. 1?
Standing Rock No. 1 is owned by BIA (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Standing Rock No. 1 built?
Standing Rock No. 1 was completed in 1991, making it 35 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 Standing Rock No. 1?
Standing Rock No. 1 serves the following purposes: Irrigation, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Standing Rock No. 1 last inspected?
Standing Rock No. 1 was last inspected on October 9, 2012. Inspection dates indicate when a formal review occurred, not the results of that inspection.