Mcnab Dam
Key Takeaway
Mcnab Dam is classified as low hazard in Montana. It was completed in 2003 and is 23 years old.
Physical Details
| Dam Length | 396 ft |
| Dam Type | Gravity |
| Max Storage | 172 acre-ft |
| Surface Area | 11 acres |
| Year Completed | 2003 (23 years old) |
| NID ID | MT03893 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
DOI BLM
Federal Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Mcnab Dam?
Mcnab Dam is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Mcnab Dam?
Mcnab Dam is owned by DOI BLM (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Mcnab Dam built?
Mcnab Dam was completed in 2003, making it 23 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
When was Mcnab Dam last inspected?
Mcnab Dam was last inspected on August 18, 2016. Inspection dates indicate when a formal review occurred, not the results of that inspection.