Porcupine
Key Takeaway
Porcupine is classified as low hazard in Wyoming. It was completed in 1979 and is 47 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 35 ft (taller than 78.8% in WY) |
| Dam Length | 1,450 ft |
| Dam Type | Earth |
| Max Storage | 865 acre-ft |
| Normal Storage | 590 acre-ft |
| Surface Area | 70 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 390 cfs |
| Year Completed | 1979 (47 years old) |
| NID ID | WY00733 |
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
POWDER RIVER COAL CO.
Private
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Low Hazard 28 ftFrequently Asked Questions
What is the hazard classification of Porcupine?
Porcupine 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 Porcupine?
Porcupine is owned by POWDER RIVER COAL CO. (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Porcupine built?
Porcupine was completed in 1979, making it 47 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 Porcupine?
Porcupine serves the following purposes: Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Porcupine?
Porcupine has a dam height of 35 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 Porcupine last inspected?
Porcupine was last inspected on September 27, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.