Sibley
Key Takeaway
Sibley is classified as high hazard in Wyoming. It was completed in 1938 and is 88 years old. Its primary use is recreation. 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 | 30 ft (taller than 63.1% in WY) |
| Dam Length | 420 ft |
| Dam Type | Earth |
| Max Storage | 635 acre-ft |
| Normal Storage | 379 acre-ft |
| Surface Area | 34 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 1,360 cfs |
| Year Completed | 1938 (88 years old) |
| NID ID | WY01344 |
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
USDA FS
Federal Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Sibley?
Sibley 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 Sibley?
Sibley is owned by USDA FS (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Sibley built?
Sibley was completed in 1938, making it 88 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 Sibley?
Sibley serves the following purposes: Recreation, Fish And Wildlife Pond. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Sibley?
Sibley has a dam height of 30 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 Sibley last inspected?
Sibley was last inspected on August 27, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.