Pierce
Key Takeaway
Pierce is classified as significant hazard in Wyoming. It was completed in 1918 and is 108 years old. Its primary use is irrigation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 30 ft (taller than 63.1% in WY) |
| Dam Length | 4,500 ft |
| Dam Type | Earth |
| Max Storage | 3.7K acre-ft |
| Normal Storage | 3.2K acre-ft |
| Surface Area | 199 acres |
| Drainage Area | 20 sq mi |
| Max Discharge | 1,323 cfs |
| Year Completed | 1918 (108 years old) |
| Year Modified | 1987 |
| NID ID | WY00357 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
PIERCE RESERVOIR INCORPORATED
State Government
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Low Hazard 24 ftFrequently Asked Questions
What is the hazard classification of Pierce?
Pierce is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Pierce?
Pierce is owned by PIERCE RESERVOIR INCORPORATED (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Pierce built?
Pierce was completed in 1918, making it 108 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 Pierce?
Pierce 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 Pierce?
Pierce has a dam height of 30 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 Pierce last inspected?
Pierce was last inspected on August 22, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.