Grizzly Gulch Tailings Dam
Key Takeaway
Grizzly Gulch Tailings Dam is classified as high hazard in South Dakota. It was completed in 1998 and is 28 years old. Its primary use is tailings. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.
Physical Details
| Dam Height | 380 ft (taller than 100% in SD) |
| Dam Length | 2,000 ft |
| Dam Type | Earth |
| Max Storage | 20.2K acre-ft |
| Normal Storage | 2.1K acre-ft |
| Surface Area | 304 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1998 (28 years old) |
| NID ID | SD02255 |
Safety Information
Loss of human life is likely if the dam fails.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
HOMESTAKE MINING COMPANY
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Grizzly Gulch Tailings Dam?
Grizzly Gulch Tailings Dam is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Grizzly Gulch Tailings Dam?
Grizzly Gulch Tailings Dam is owned by HOMESTAKE MINING COMPANY (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Grizzly Gulch Tailings Dam built?
Grizzly Gulch Tailings Dam was completed in 1998, making it 28 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 Grizzly Gulch Tailings Dam?
Grizzly Gulch Tailings Dam serves the following purposes: Tailings. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Grizzly Gulch Tailings Dam?
Grizzly Gulch Tailings Dam has a dam height of 380 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 Grizzly Gulch Tailings Dam last inspected?
Grizzly Gulch Tailings Dam was last inspected on September 6, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.