South Arm Reservoir
Key Takeaway
South Arm Reservoir is classified as low hazard in Oregon. It was completed in 1908 and is 118 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 19 ft (taller than 27.8% in OR) |
| Dam Length | 170 ft |
| Dam Type | Earth |
| Max Storage | 560 acre-ft |
| Normal Storage | 560 acre-ft |
| Surface Area | 129 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 180 cfs |
| Year Completed | 1908 (118 years old) |
| NID ID | OR00078 |
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
RICHARD E MORGAN
Private
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High Hazard 60 ftFrequently Asked Questions
What is the hazard classification of South Arm Reservoir?
South Arm 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 South Arm Reservoir?
South Arm Reservoir is owned by RICHARD E MORGAN (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was South Arm Reservoir built?
South Arm Reservoir was completed in 1908, making it 118 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 South Arm Reservoir?
South Arm 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 South Arm Reservoir?
South Arm Reservoir has a dam height of 19 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 South Arm Reservoir last inspected?
South Arm Reservoir was last inspected on August 12, 2015. Inspection dates indicate when a formal review occurred, not the results of that inspection.