Jawbone Dam #2
Key Takeaway
Jawbone Dam #2 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 | 31 ft (taller than 90.2% in MT) |
| Dam Length | 430 ft |
| Dam Type | Earth |
| Max Storage | 113 acre-ft |
| Surface Area | 0 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 400 cfs |
| Year Completed | 1966 (60 years old) |
| NID ID | MT00071 |
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 Dam #2?
Jawbone Dam #2 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 Dam #2?
Jawbone Dam #2 is owned by CITY OF HARLOWTON (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Jawbone Dam #2 built?
Jawbone Dam #2 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 Dam #2?
Jawbone Dam #2 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 Dam #2?
Jawbone Dam #2 has a dam height of 31 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 Dam #2 last inspected?
Jawbone Dam #2 was last inspected on April 1, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.