John Isaac
Key Takeaway
John Isaac is classified as low hazard in South Dakota. It was completed in 1951 and is 75 years old. Its primary use is fire protection.
Physical Details
| Dam Height | 20 ft (taller than 33.7% in SD) |
| Dam Length | 400 ft |
| Dam Type | Earth |
| Max Storage | 72 acre-ft |
| Normal Storage | 50 acre-ft |
| Max Discharge | 500 cfs |
| Year Completed | 1951 (75 years old) |
| NID ID | SD02056 |
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
CLAIRE JOHN
Private
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Low Hazard 19 ftFrequently Asked Questions
What is the hazard classification of John Isaac?
John Isaac 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 Isaac?
John Isaac is owned by CLAIRE JOHN (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was John Isaac built?
John Isaac was completed in 1951, making it 75 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 Isaac?
John Isaac 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 Isaac?
John Isaac 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.