Tisdale Lake
Key Takeaway
Tisdale Lake is classified as low hazard in South Dakota. It was completed in 1935 and is 91 years old. Its primary use is recreation.
Physical Details
| Dam Height | 30 ft (taller than 85.2% in SD) |
| Dam Length | 1,090 ft |
| Dam Type | Earth |
| Max Storage | 310 acre-ft |
| Normal Storage | 230 acre-ft |
| Surface Area | 28 acres |
| Max Discharge | 3,000 cfs |
| Year Completed | 1935 (91 years old) |
| NID ID | SD01056 |
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
GF&P
State Government
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Low Hazard 25 ftFrequently Asked Questions
What is the hazard classification of Tisdale Lake?
Tisdale Lake 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 Tisdale Lake?
Tisdale Lake is owned by GF&P (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Tisdale Lake built?
Tisdale Lake 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 Tisdale Lake?
Tisdale Lake serves the following purposes: Recreation, Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Tisdale Lake?
Tisdale Lake has a dam height of 30 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 Tisdale Lake last inspected?
Tisdale Lake was last inspected on November 18, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.