Simon Dam
Key Takeaway
Simon Dam is classified as low hazard in South Dakota. It was completed in 1936 and is 90 years old. Its primary use is recreation.
Physical Details
| Dam Height | 21 ft (taller than 40.7% in SD) |
| Dam Length | 490 ft |
| Dam Type | Earth |
| Max Storage | 1.3K acre-ft |
| Normal Storage | 611 acre-ft |
| Max Discharge | 2,940 cfs |
| Year Completed | 1936 (90 years old) |
| Year Modified | 2000 |
| NID ID | SD00956 |
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
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Simon Dam?
Simon 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 Simon Dam?
Simon Dam is owned by S&PL (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Simon Dam built?
Simon Dam was completed in 1936, making it 90 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 Simon Dam?
Simon 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 Simon Dam?
Simon Dam has a dam height of 21 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 Simon Dam last inspected?
Simon Dam was last inspected on October 20, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.