Mainline 1
Key Takeaway
Mainline 1 is classified as significant hazard in Oregon. It was completed in 1969 and is 57 years old. Its primary use is irrigation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 57 ft (taller than 87% in OR) |
| Dam Length | 460 ft |
| Dam Type | Earth |
| Max Storage | 500 acre-ft |
| Normal Storage | 445 acre-ft |
| Surface Area | 21 acres |
| Drainage Area | 6 sq mi |
| Max Discharge | 611 cfs |
| Year Completed | 1969 (57 years old) |
| NID ID | OR00452 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
WAIBEL RANCHES LLC
Private
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Low Hazard 33 ftFrequently Asked Questions
What is the hazard classification of Mainline 1?
Mainline 1 is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Mainline 1?
Mainline 1 is owned by WAIBEL RANCHES LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Mainline 1 built?
Mainline 1 was completed in 1969, making it 57 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 Mainline 1?
Mainline 1 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 Mainline 1?
Mainline 1 has a dam height of 57 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 Mainline 1 last inspected?
Mainline 1 was last inspected on December 18, 2018. Inspection dates indicate when a formal review occurred, not the results of that inspection.