Pr-11 Retention Dam
Key Takeaway
Pr-11 Retention Dam is classified as low hazard in Montana. It was completed in 1942 and is 84 years old. Its primary use is flood risk reduction.
Physical Details
| Dam Length | 294 ft |
| Dam Type | Gravity |
| Max Storage | 530 acre-ft |
| Surface Area | 99 acres |
| Drainage Area | 1 sq mi |
| Year Completed | 1942 (84 years old) |
| Year Modified | 1942 |
| NID ID | MT00789 |
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
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Low HazardFrequently Asked Questions
What is the hazard classification of Pr-11 Retention Dam?
Pr-11 Retention 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 Pr-11 Retention Dam?
Pr-11 Retention Dam is owned by DOI BLM (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Pr-11 Retention Dam built?
Pr-11 Retention Dam was completed in 1942, making it 84 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 Pr-11 Retention Dam?
Pr-11 Retention Dam serves the following purposes: Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Pr-11 Retention Dam last inspected?
Pr-11 Retention Dam was last inspected on August 15, 2016. Inspection dates indicate when a formal review occurred, not the results of that inspection.