Derry Robert No.1
Key Takeaway
Derry Robert No.1 is classified as low hazard in South Dakota. It was completed in 1965 and is 61 years old. Its primary use is fire protection.
Physical Details
| Dam Height | 28 ft (taller than 77.7% in SD) |
| Dam Length | 444 ft |
| Dam Type | Earth |
| Max Storage | 43 acre-ft |
| Normal Storage | 28 acre-ft |
| Max Discharge | 432 cfs |
| Year Completed | 1965 (61 years old) |
| NID ID | SD01286 |
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
ROBERT DERRY
Private
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Low Hazard 32 ftFrequently Asked Questions
What is the hazard classification of Derry Robert No.1?
Derry Robert No.1 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 Derry Robert No.1?
Derry Robert No.1 is owned by ROBERT DERRY (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Derry Robert No.1 built?
Derry Robert No.1 was completed in 1965, making it 61 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 Derry Robert No.1?
Derry Robert No.1 serves the following purposes: Fire Protection, Stock, Or Small Fish Pond, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Derry Robert No.1?
Derry Robert No.1 has a dam height of 28 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.