East Lemmon
Key Takeaway
East Lemmon is classified as low hazard in South Dakota. It was completed in 1930 and is 96 years old. Its primary use is recreation.
Physical Details
| Dam Height | 30 ft (taller than 85.2% in SD) |
| Dam Length | 1,200 ft |
| Dam Type | Earth |
| Max Storage | 2.6K acre-ft |
| Normal Storage | 1.4K acre-ft |
| Surface Area | 165 acres |
| Drainage Area | 88 sq mi |
| Max Discharge | 8,429 cfs |
| Year Completed | 1930 (96 years old) |
| Year Modified | 2000 |
| NID ID | SD00921 |
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 19 ftFrequently Asked Questions
What is the hazard classification of East Lemmon?
East Lemmon 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 East Lemmon?
East Lemmon is owned by GF&P (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was East Lemmon built?
East Lemmon was completed in 1930, making it 96 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 East Lemmon?
East Lemmon 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 East Lemmon?
East Lemmon 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 East Lemmon last inspected?
East Lemmon was last inspected on November 7, 2018. Inspection dates indicate when a formal review occurred, not the results of that inspection.