Chapman Upper
Key Takeaway
Chapman Upper is classified as low hazard in Oregon. It was completed in 1948 and is 78 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 15 ft (taller than 16% in OR) |
| Dam Length | 850 ft |
| Dam Type | Earth |
| Max Storage | 500 acre-ft |
| Normal Storage | 223 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 95 cfs |
| Year Completed | 1948 (78 years old) |
| NID ID | OR00176 |
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
SECOND OREGON, LLC
Private
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High Hazard 100 ftFrequently Asked Questions
What is the hazard classification of Chapman Upper?
Chapman 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 Chapman Upper?
Chapman Upper is owned by SECOND OREGON, LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Chapman Upper built?
Chapman Upper was completed in 1948, making it 78 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 Chapman Upper?
Chapman 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 Chapman Upper?
Chapman Upper 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.
When was Chapman Upper last inspected?
Chapman Upper was last inspected on May 19, 2016. Inspection dates indicate when a formal review occurred, not the results of that inspection.