Thomas Number 3
Key Takeaway
Thomas Number 3 is classified as low hazard in South Dakota. It was completed in 1959 and is 67 years old. Its primary use is water supply.
Physical Details
| Dam Height | 28 ft (taller than 77.7% in SD) |
| Dam Length | 405 ft |
| Dam Type | Earth |
| Max Storage | 49 acre-ft |
| Normal Storage | 31 acre-ft |
| Max Discharge | 1,050 cfs |
| Year Completed | 1959 (67 years old) |
| NID ID | SD01629 |
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
S&PL
State Government
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Low Hazard 29 ftFrequently Asked Questions
What is the hazard classification of Thomas Number 3?
Thomas Number 3 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 Thomas Number 3?
Thomas Number 3 is owned by S&PL (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Thomas Number 3 built?
Thomas Number 3 was completed in 1959, making it 67 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 Thomas Number 3?
Thomas Number 3 serves the following purposes: Water Supply, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Thomas Number 3?
Thomas Number 3 has a dam height of 28 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 Thomas Number 3 last inspected?
Thomas Number 3 was last inspected on June 1, 1990. Inspection dates indicate when a formal review occurred, not the results of that inspection.