Jawbone Dike #1
Key Takeaway
Jawbone Dike #1 is classified as high hazard in Montana. It was completed in 1966 and is 60 years old. Its primary use is flood risk reduction. 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 | 13 ft (taller than 14.7% in MT) |
| Dam Length | 780 ft |
| Dam Type | Earth |
| Max Storage | 1.9K acre-ft |
| Surface Area | 0 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 140 cfs |
| Year Completed | 1966 (60 years old) |
| NID ID | MT00785 |
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
CITY OF HARLOWTON
Local Government
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Low Hazard 20 ftFrequently Asked Questions
What is the hazard classification of Jawbone Dike #1?
Jawbone Dike #1 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 Jawbone Dike #1?
Jawbone Dike #1 is owned by CITY OF HARLOWTON (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Jawbone Dike #1 built?
Jawbone Dike #1 was completed in 1966, making it 60 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 Jawbone Dike #1?
Jawbone Dike #1 serves the following purposes: Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Jawbone Dike #1?
Jawbone Dike #1 has a dam height of 13 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 Jawbone Dike #1 last inspected?
Jawbone Dike #1 was last inspected on April 1, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.