Ralph Hedman
Key Takeaway
Ralph Hedman is classified as significant hazard in South Dakota. It was completed in 1958 and is 68 years old. Its primary use is fire protection. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 27 ft (taller than 71.8% in SD) |
| Dam Length | 660 ft |
| Dam Type | Earth |
| Max Storage | 102 acre-ft |
| Normal Storage | 59 acre-ft |
| Max Discharge | 759 cfs |
| Year Completed | 1958 (68 years old) |
| NID ID | SD01574 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
RALPH HEDMAN
Private
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What is the hazard classification of Ralph Hedman?
Ralph Hedman is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Ralph Hedman?
Ralph Hedman is owned by RALPH HEDMAN (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Ralph Hedman built?
Ralph Hedman was completed in 1958, making it 68 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 Ralph Hedman?
Ralph Hedman 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 Ralph Hedman?
Ralph Hedman has a dam height of 27 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.