Four Horns
Key Takeaway
Four Horns is classified as high hazard in Montana. It was completed in 1931 and is 95 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 | 1,150 ft |
| Dam Type | Earth |
| Normal Storage | 20.0K acre-ft |
| Year Completed | 1931 (95 years old) |
| NID ID | MT01138 |
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
BIA
Federal Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Four Horns?
Four Horns 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 Four Horns?
Four Horns is owned by BIA (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Four Horns built?
Four Horns was completed in 1931, making it 95 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 Four Horns?
Four Horns 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 Four Horns last inspected?
Four Horns was last inspected on September 13, 2012. Inspection dates indicate when a formal review occurred, not the results of that inspection.