Upper Glasston North Dam
Key Takeaway
Upper Glasston North Dam is classified as high hazard in Montana. It was completed in 1912 and is 114 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 | 20 ft (taller than 44.5% in MT) |
| Dam Length | 600 ft |
| Dam Type | Earth |
| Max Storage | 1.8K acre-ft |
| Normal Storage | 924 acre-ft |
| Year Completed | 1912 (114 years old) |
| NID ID | MT03267 |
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
SWEETGRASS CANAL & RES CO
Private
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Significant Hazard 20 ftFrequently Asked Questions
What is the hazard classification of Upper Glasston North Dam?
Upper Glasston North 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 Upper Glasston North Dam?
Upper Glasston North Dam is owned by SWEETGRASS CANAL & RES CO (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Upper Glasston North Dam built?
Upper Glasston North Dam was completed in 1912, making it 114 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 Upper Glasston North Dam?
Upper Glasston North 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 Upper Glasston North Dam?
Upper Glasston North Dam has a dam height of 20 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 Upper Glasston North Dam last inspected?
Upper Glasston North Dam was last inspected on July 10, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.