Pierson-Upper
Key Takeaway
Pierson-Upper is classified as low hazard in Oregon. It was completed in 1965 and is 61 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 31 ft (taller than 62.3% in OR) |
| Dam Length | 120 ft |
| Dam Type | Earth |
| Max Storage | 18 acre-ft |
| Normal Storage | 17 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 205 cfs |
| Year Completed | 1965 (61 years old) |
| NID ID | OR00426 |
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
JEFFERY W. GEIGER
Private
Nearby Dams
Hochstein Dam #3
Washington, OR
Low Hazard 45 ftCook Reservoir (Wash)
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Significant Hazard 28 ftUnger-Bill Dam
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Significant Hazard 39 ftHoefer-Pierson Reservoir
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Significant Hazard 23 ftWalters, Glenn #1 - Large
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Significant Hazard 25 ftWalters, Glenn #5
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Significant Hazard 29 ftDober Reservoir
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Significant Hazard 23 ftJesse Enlargement
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Significant Hazard 32 ftFrequently Asked Questions
What is the hazard classification of Pierson-Upper?
Pierson-Upper 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 Pierson-Upper?
Pierson-Upper is owned by JEFFERY W. GEIGER (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Pierson-Upper built?
Pierson-Upper was completed in 1965, making it 61 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 Pierson-Upper?
Pierson-Upper 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 Pierson-Upper?
Pierson-Upper has a dam height of 31 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 Pierson-Upper last inspected?
Pierson-Upper was last inspected on March 17, 2015. Inspection dates indicate when a formal review occurred, not the results of that inspection.