Bigfork Diversion Dam
Key Takeaway
Bigfork Diversion Dam is classified as high hazard in Montana. It was completed in 1910 and is 116 years old. Its primary use is hydroelectric. 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 | 22 ft (taller than 63.5% in MT) |
| Dam Length | 92 ft |
| Dam Type | Gravity |
| Normal Storage | 109 acre-ft |
| Surface Area | 73 acres |
| Drainage Area | 736 sq mi |
| Year Completed | 1910 (116 years old) |
| NID ID | MT00220 |
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
PacifiCorp
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Bigfork Diversion Dam?
Bigfork Diversion 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 Bigfork Diversion Dam?
Bigfork Diversion Dam is owned by PacifiCorp (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Bigfork Diversion Dam built?
Bigfork Diversion Dam was completed in 1910, making it 116 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 Bigfork Diversion Dam?
Bigfork Diversion Dam serves the following purposes: Hydroelectric, Fish And Wildlife Pond, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Bigfork Diversion Dam?
Bigfork Diversion Dam has a dam height of 22 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 Bigfork Diversion Dam last inspected?
Bigfork Diversion Dam was last inspected on October 18, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.