Lewis Dam
Key Takeaway
Lewis Dam is classified as low hazard in South Dakota. It was completed in 1961 and is 65 years old. Its primary use is fire protection.
Physical Details
| Dam Height | 20 ft (taller than 33.7% in SD) |
| Dam Length | 405 ft |
| Dam Type | Earth |
| Max Storage | 60 acre-ft |
| Normal Storage | 42 acre-ft |
| Max Discharge | 1,125 cfs |
| Year Completed | 1961 (65 years old) |
| NID ID | SD01981 |
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
FRED LEWIS
Private
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Low Hazard 18 ftFrequently Asked Questions
What is the hazard classification of Lewis Dam?
Lewis 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 Lewis Dam?
Lewis Dam is owned by FRED LEWIS (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lewis Dam built?
Lewis Dam was completed in 1961, making it 65 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 Lewis Dam?
Lewis Dam serves the following purposes: Fire Protection, Stock, Or Small Fish Pond. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Lewis Dam?
Lewis Dam has a dam height of 20 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.