Spearfish Valley Ranch
Key Takeaway
Spearfish Valley Ranch is classified as low hazard in South Dakota. It was completed in 1968 and is 58 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 32 ft (taller than 90.4% in SD) |
| Dam Length | 660 ft |
| Dam Type | Earth |
| Max Storage | 136 acre-ft |
| Normal Storage | 98 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 520 cfs |
| Year Completed | 1968 (58 years old) |
| NID ID | SD01014 |
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
MELVIN DELZER
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Spearfish Valley Ranch?
Spearfish Valley Ranch 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 Spearfish Valley Ranch?
Spearfish Valley Ranch is owned by MELVIN DELZER (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Spearfish Valley Ranch built?
Spearfish Valley Ranch was completed in 1968, making it 58 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 Spearfish Valley Ranch?
Spearfish Valley Ranch 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 Spearfish Valley Ranch?
Spearfish Valley Ranch has a dam height of 32 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.
When was Spearfish Valley Ranch last inspected?
Spearfish Valley Ranch was last inspected on July 18, 1986. Inspection dates indicate when a formal review occurred, not the results of that inspection.