Perigee
Key Takeaway
Perigee is classified as low hazard in Montana. It was completed in 1935 and is 91 years old. Its primary use is fire protection.
Physical Details
| Dam Height | 15 ft (taller than 18.8% in MT) |
| Dam Length | 275 ft |
| Dam Type | Earth |
| Max Storage | 62 acre-ft |
| Normal Storage | 13 acre-ft |
| Year Completed | 1935 (91 years old) |
| NID ID | MT00282 |
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
HILLDALE COLONY
Private
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Low Hazard 25 ftFrequently Asked Questions
What is the hazard classification of Perigee?
Perigee 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 Perigee?
Perigee is owned by HILLDALE COLONY (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Perigee built?
Perigee was completed in 1935, making it 91 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 Perigee?
Perigee 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 Perigee?
Perigee has a dam height of 15 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.