Hillsboro West (Lagoon)
Key Takeaway
Hillsboro West (Lagoon) is classified as low hazard in Oregon. It was completed in 1984 and is 42 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 12 ft (taller than 7.2% in OR) |
| Dam Length | 3,000 ft |
| Dam Type | Earth |
| Max Storage | 120 acre-ft |
| Normal Storage | 120 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1984 (42 years old) |
| NID ID | OR00691 |
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
UNFIED SEWAGE AGENCY OF WASHINGTON COUNTY
Public Utility
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Significant Hazard 29 ftFrequently Asked Questions
What is the hazard classification of Hillsboro West (Lagoon)?
Hillsboro West (Lagoon) 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 Hillsboro West (Lagoon)?
Hillsboro West (Lagoon) is owned by UNFIED SEWAGE AGENCY OF WASHINGTON COUNTY (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Hillsboro West (Lagoon) built?
Hillsboro West (Lagoon) was completed in 1984, making it 42 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 Hillsboro West (Lagoon)?
Hillsboro West (Lagoon) 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 Hillsboro West (Lagoon)?
Hillsboro West (Lagoon) has a dam height of 12 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 Hillsboro West (Lagoon) last inspected?
Hillsboro West (Lagoon) was last inspected on September 30, 2015. Inspection dates indicate when a formal review occurred, not the results of that inspection.