Capitol Lake Dam
Key Takeaway
Capitol Lake Dam is classified as high hazard in South Dakota. It was completed in 1921 and is 105 years old. Its primary use is recreation. 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 Height | 27 ft (taller than 71.8% in SD) |
| Dam Length | 600 ft |
| Dam Type | Earth |
| Max Storage | 127 acre-ft |
| Normal Storage | 65 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 6 sq mi |
| Max Discharge | 2,200 cfs |
| Year Completed | 1921 (105 years old) |
| NID ID | SD02209 |
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
S&PL
State Government
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Significant Hazard 17 ftFrequently Asked Questions
What is the hazard classification of Capitol Lake Dam?
Capitol Lake Dam 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 Capitol Lake Dam?
Capitol Lake Dam is owned by S&PL (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Capitol Lake Dam built?
Capitol Lake Dam was completed in 1921, making it 105 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 Capitol Lake Dam?
Capitol Lake 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 Capitol Lake Dam?
Capitol Lake Dam has a dam height of 27 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 Capitol Lake Dam last inspected?
Capitol Lake Dam was last inspected on July 27, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.