Williamson Dam
Key Takeaway
Williamson Dam is classified as low hazard in South Dakota. It was completed in 1984 and is 42 years old. Its primary use is fire protection.
Physical Details
| Dam Height | 16 ft (taller than 15.7% in SD) |
| Dam Length | 460 ft |
| Dam Type | Earth |
| Max Storage | 220 acre-ft |
| Normal Storage | 110 acre-ft |
| Surface Area | 23 acres |
| Drainage Area | 30 sq mi |
| Max Discharge | 20,000 cfs |
| Year Completed | 1984 (42 years old) |
| NID ID | SD02348 |
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
MARRS RANCH, LLC
Private
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What is the hazard classification of Williamson Dam?
Williamson Dam 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 Williamson Dam?
Williamson Dam is owned by MARRS RANCH, LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Williamson Dam built?
Williamson Dam was completed in 1984, making it 42 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 Williamson Dam?
Williamson Dam serves the following purposes: Fire Protection, Stock, Or Small Fish Pond, Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Williamson Dam?
Williamson 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.