John Holloway
Key Takeaway
John Holloway is classified as low hazard in South Dakota. It was completed in 1945 and is 81 years old. Its primary use is fire protection.
Physical Details
| Dam Height | 18 ft (taller than 24.1% in SD) |
| Dam Length | 500 ft |
| Dam Type | Earth |
| Max Storage | 56 acre-ft |
| Normal Storage | 20 acre-ft |
| Max Discharge | 2,000 cfs |
| Year Completed | 1945 (81 years old) |
| NID ID | SD01670 |
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
JOHN HOLLOWAY
Private
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Low Hazard 20 ftFrequently Asked Questions
What is the hazard classification of John Holloway?
John Holloway 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 John Holloway?
John Holloway is owned by JOHN HOLLOWAY (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was John Holloway built?
John Holloway was completed in 1945, making it 81 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 John Holloway?
John Holloway 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 John Holloway?
John Holloway has a dam height of 18 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.