Pierce Reservoir
Key Takeaway
Pierce Reservoir is classified as low hazard in Oregon. It was completed in 1955 and is 71 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 29 ft (taller than 57.4% in OR) |
| Dam Length | 1,138 ft |
| Dam Type | Earth |
| Max Storage | 250 acre-ft |
| Normal Storage | 230 acre-ft |
| Surface Area | 23 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 400 cfs |
| Year Completed | 1955 (71 years old) |
| NID ID | OR00139 |
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
W. V. JOHNSTON
Private
Nearby Dams
Nelson Reservoir No. 1
Jackson, OR
Low Hazard 34 ftYankee
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High Hazard 55 ftAgate
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High Hazard 77 ftFrog Pond #1
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Significant Hazard 22 ftBradshaw
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Significant Hazard 47 ftHarrison
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Significant Hazard 26 ftBradshaw 2
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Significant Hazard 20 ftOsborne Creek
Jackson, OR
High Hazard 60 ftFrequently Asked Questions
What is the hazard classification of Pierce Reservoir?
Pierce Reservoir 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 Pierce Reservoir?
Pierce Reservoir is owned by W. V. JOHNSTON (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Pierce Reservoir built?
Pierce Reservoir was completed in 1955, making it 71 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 Reservoir?
Pierce Reservoir 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 Reservoir?
Pierce Reservoir has a dam height of 29 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 Reservoir last inspected?
Pierce Reservoir was last inspected on October 13, 2015. Inspection dates indicate when a formal review occurred, not the results of that inspection.