Ninemile
Key Takeaway
Ninemile is classified as high hazard in Utah. It was completed in 1900 and is 126 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 Length | 825 ft |
| Dam Type | Earth |
| Max Storage | 4.3K acre-ft |
| Normal Storage | 3.5K acre-ft |
| Drainage Area | 4 sq mi |
| Max Discharge | 122 cfs |
| Year Completed | 1900 (126 years old) |
| NID ID | UT00138 |
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
GUNNISON IRRIGATION COMPANY
Private
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Significant HazardFrequently Asked Questions
What is the hazard classification of Ninemile?
Ninemile 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 Ninemile?
Ninemile is owned by GUNNISON IRRIGATION COMPANY (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Ninemile built?
Ninemile was completed in 1900, making it 126 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 Ninemile?
Ninemile serves the following purposes: Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Ninemile last inspected?
Ninemile was last inspected on August 9, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.