Storm Lake Dam
Key Takeaway
Storm Lake Dam is classified as high hazard in Montana. It was completed in 1898 and is 128 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 | 29 ft (taller than 82.2% in MT) |
| Dam Length | 500 ft |
| Dam Type | Earth |
| Max Storage | 2.2K acre-ft |
| Normal Storage | 1.9K acre-ft |
| Surface Area | 78 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 520 cfs |
| Year Completed | 1898 (128 years old) |
| NID ID | MT01357 |
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
BUTTE-SILVER BOW
Local Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Storm Lake Dam?
Storm Lake 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 Storm Lake Dam?
Storm Lake Dam is owned by BUTTE-SILVER BOW (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Storm Lake Dam built?
Storm Lake Dam was completed in 1898, making it 128 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 Storm Lake Dam?
Storm Lake 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 Storm Lake Dam?
Storm Lake Dam has a dam height of 29 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 Storm Lake Dam last inspected?
Storm Lake Dam was last inspected on July 8, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.