Iris
Key Takeaway
Iris is classified as low hazard in Montana. It was completed in 1950 and is 76 years old. Its primary use is fire protection.
Physical Details
| Dam Height | 12 ft (taller than 9.2% in MT) |
| Dam Length | 400 ft |
| Dam Type | Earth |
| Max Storage | 70 acre-ft |
| Normal Storage | 30 acre-ft |
| Year Completed | 1950 (76 years old) |
| NID ID | MT02667 |
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
IRIS HANSON
Private
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Low Hazard 23 ftFrequently Asked Questions
What is the hazard classification of Iris?
Iris 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 Iris?
Iris is owned by IRIS HANSON (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Iris built?
Iris was completed in 1950, making it 76 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 Iris?
Iris serves the following purposes: Fire Protection, Stock, Or Small Fish Pond. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Iris?
Iris has a dam height of 12 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.