Koskan
Key Takeaway
Koskan is classified as low hazard in South Dakota. It was completed in 1956 and is 70 years old. Its primary use is fire protection.
Physical Details
| Dam Height | 22 ft (taller than 45.6% in SD) |
| Dam Length | 342 ft |
| Dam Type | Earth |
| Max Storage | 55 acre-ft |
| Normal Storage | 47 acre-ft |
| Max Discharge | 100 cfs |
| Year Completed | 1956 (70 years old) |
| NID ID | SD01535 |
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
KOSKAN
Private
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Low Hazard 22 ftFrequently Asked Questions
What is the hazard classification of Koskan?
Koskan 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 Koskan?
Koskan is owned by KOSKAN (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Koskan built?
Koskan was completed in 1956, making it 70 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 Koskan?
Koskan 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 Koskan?
Koskan has a dam height of 22 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.