Bynum Reservoir Dam
Key Takeaway
Bynum Reservoir Dam is classified as high hazard in Montana. It was completed in 1926 and is 100 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 | 60 ft (taller than 97.6% in MT) |
| Dam Length | 3,700 ft |
| Dam Type | Earth |
| Max Storage | 107.0K acre-ft |
| Normal Storage | 87.0K acre-ft |
| Surface Area | 3,200 acres |
| Drainage Area | 33 sq mi |
| Max Discharge | 2,000 cfs |
| Year Completed | 1926 (100 years old) |
| NID ID | MT01356 |
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
TETON COOPERATIVE RESERVOIR COMPANY
Private
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Low Hazard 15 ftFrequently Asked Questions
What is the hazard classification of Bynum Reservoir Dam?
Bynum Reservoir Dam 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 Bynum Reservoir Dam?
Bynum Reservoir Dam is owned by TETON COOPERATIVE RESERVOIR COMPANY (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Bynum Reservoir Dam built?
Bynum Reservoir Dam was completed in 1926, making it 100 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 Bynum Reservoir Dam?
Bynum Reservoir Dam 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 Bynum Reservoir Dam?
Bynum Reservoir Dam has a dam height of 60 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 Bynum Reservoir Dam last inspected?
Bynum Reservoir Dam was last inspected on October 25, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.