Big Horn Dike A
Key Takeaway
Big Horn Dike A is classified as high hazard in Wyoming. It was completed in 1964 and is 62 years old. Its primary use is irrigation. 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 | 45 ft (taller than 91.2% in WY) |
| Dam Length | 775 ft |
| Dam Type | Earth |
| Max Storage | 5.8K acre-ft |
| Normal Storage | 4.6K acre-ft |
| Surface Area | 179 acres |
| Drainage Area | 11 sq mi |
| Max Discharge | 4,756 cfs |
| Year Completed | 1964 (62 years old) |
| Year Modified | 1985 |
| NID ID | WY00459 |
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
BIG HORN RESERVOIR COMPANY
Private
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High Hazard 95 ftFrequently Asked Questions
What is the hazard classification of Big Horn Dike A?
Big Horn Dike A 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 Big Horn Dike A?
Big Horn Dike A is owned by BIG HORN RESERVOIR COMPANY (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Big Horn Dike A built?
Big Horn Dike A was completed in 1964, making it 62 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 Big Horn Dike A?
Big Horn Dike A 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 Big Horn Dike A?
Big Horn Dike A has a dam height of 45 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 Big Horn Dike A last inspected?
Big Horn Dike A was last inspected on August 8, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.