Agnes Lake
Key Takeaway
Agnes Lake is classified as high hazard in Montana. It was completed in 1928 and is 98 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 | 13 ft (taller than 14.7% in MT) |
| Dam Length | 174 ft |
| Dam Type | Earth |
| Max Storage | 1.9K acre-ft |
| Normal Storage | 790 acre-ft |
| Surface Area | 99 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 560 cfs |
| Year Completed | 1928 (98 years old) |
| NID ID | MT00817 |
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
BURK RANCHES INC
Private
Nearby Dams
Bond Lake Dam
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High Hazard 27 ftPear Lake Dam
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High Hazard 19 ftAnchor South Dam
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High Hazard 11 ftTub Lake Dam
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Significant Hazard 13 ftFrequently Asked Questions
What is the hazard classification of Agnes Lake?
Agnes Lake 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 Agnes Lake?
Agnes Lake is owned by BURK RANCHES INC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Agnes Lake built?
Agnes Lake was completed in 1928, making it 98 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 Agnes Lake?
Agnes Lake 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 Agnes Lake?
Agnes Lake 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.