Rob Roy
Key Takeaway
Rob Roy is classified as high hazard in Wyoming. It was completed in 1986 and is 40 years old. Its primary use is water supply. 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 | 140 ft (taller than 99.1% in WY) |
| Dam Length | 1,095 ft |
| Dam Type | Earth |
| Max Storage | 42.3K acre-ft |
| Normal Storage | 35.4K acre-ft |
| Surface Area | 801 acres |
| Drainage Area | 21 sq mi |
| Max Discharge | 4,500 cfs |
| Year Completed | 1986 (40 years old) |
| NID ID | WY00084 |
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
CHEYENNE BOARD OF PUBLIC UTILITIES
Local Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Rob Roy?
Rob Roy 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 Rob Roy?
Rob Roy is owned by CHEYENNE BOARD OF PUBLIC UTILITIES (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Rob Roy built?
Rob Roy was completed in 1986, making it 40 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 Rob Roy?
Rob Roy serves the following purposes: Water Supply, Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Rob Roy?
Rob Roy has a dam height of 140 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 Rob Roy last inspected?
Rob Roy was last inspected on July 28, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.