Portland #1 (Mt.Tabor)
Key Takeaway
Portland #1 (Mt.Tabor) is classified as high hazard in Oregon. It was completed in 1894 and is 132 years old. Its primary use is water supply. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.
Physical Details
| Dam Height | 30 ft (taller than 58.4% in OR) |
| Dam Length | 300 ft |
| Dam Type | Concrete |
| Max Storage | 37 acre-ft |
| Normal Storage | 37 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 21,000 cfs |
| Year Completed | 1894 (132 years old) |
| NID ID | OR00667 |
Safety Information
Loss of human life is likely if the dam fails.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
CITY OF PORTLAND #1
Local Government
Nearby Dams
Portland #5 (Mt.Tabor)
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High Hazard 55 ftPortland #6 (Mt.Tabor)
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High Hazard 28 ftVeterans Reservoir
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Significant Hazard 30 ftThree Creeks Natural Area
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Significant Hazard 14 ftPortland #3 (Washington Park)
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High Hazard 53 ftOswego Lake Dam
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Significant Hazard 32 ftBinford Dam
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Significant Hazard 25 ftHaberlach Dam
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Significant Hazard 22 ftFrequently Asked Questions
What is the hazard classification of Portland #1 (Mt.Tabor)?
Portland #1 (Mt.Tabor) is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Portland #1 (Mt.Tabor)?
Portland #1 (Mt.Tabor) is owned by CITY OF PORTLAND #1 (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Portland #1 (Mt.Tabor) built?
Portland #1 (Mt.Tabor) was completed in 1894, making it 132 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 Portland #1 (Mt.Tabor)?
Portland #1 (Mt.Tabor) serves the following purposes: Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Portland #1 (Mt.Tabor)?
Portland #1 (Mt.Tabor) 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 Portland #1 (Mt.Tabor) last inspected?
Portland #1 (Mt.Tabor) was last inspected on August 6, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.