Whidby Structure 20
Key Takeaway
Whidby Structure 20 is classified as significant hazard in South Dakota. It was completed in 1966 and is 60 years old. Its primary use is irrigation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 24 ft (taller than 53.3% in SD) |
| Dam Length | 400 ft |
| Dam Type | Earth |
| Max Storage | 128 acre-ft |
| Normal Storage | 85 acre-ft |
| Max Discharge | 1,050 cfs |
| Year Completed | 1966 (60 years old) |
| NID ID | SD02008 |
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
Mitchell-Slovek Ranch LLP
Private
Nearby Dams
Prokop Dam
Jackson, SD
Low Hazard 16 ftSd Noname 147
Jackson, SD
Significant Hazard 27 ftKadoka (Nid)
Jackson, SD
High Hazard 24 ftSd Noname 185
Jackson, SD
Significant Hazard 22 ftBradfield Divers. & Dete
Jackson, SD
Low Hazard 40 ftSd Noname 144
Jackson, SD
Low Hazard 25 ftSd Noname 143
Jackson, SD
Low Hazard 15 ftAndrew Dam
Jackson, SD
Low Hazard 20 ftFrequently Asked Questions
What is the hazard classification of Whidby Structure 20?
Whidby Structure 20 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 Whidby Structure 20?
Whidby Structure 20 is owned by Mitchell-Slovek Ranch LLP (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Whidby Structure 20 built?
Whidby Structure 20 was completed in 1966, making it 60 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 Whidby Structure 20?
Whidby Structure 20 serves the following purposes: Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Whidby Structure 20?
Whidby Structure 20 has a dam height of 24 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.