Thompson Valley Reservoir
Key Takeaway
Thompson Valley Reservoir is classified as significant hazard in Oregon. It was completed in 1922 and is 104 years old. Its primary use is irrigation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 48 ft (taller than 83.4% in OR) |
| Dam Length | 290 ft |
| Dam Type | Earth |
| Max Storage | 30.5K acre-ft |
| Normal Storage | 21.0K acre-ft |
| Surface Area | 1,900 acres |
| Drainage Area | 150 sq mi |
| Max Discharge | 2,514 cfs |
| Year Completed | 1922 (104 years old) |
| NID ID | OR00145 |
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
SILVER LAKE IRRIGATION DISTRICT
Local Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Thompson Valley Reservoir?
Thompson Valley Reservoir 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 Thompson Valley Reservoir?
Thompson Valley Reservoir is owned by SILVER LAKE IRRIGATION DISTRICT (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Thompson Valley Reservoir built?
Thompson Valley Reservoir was completed in 1922, making it 104 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 Thompson Valley Reservoir?
Thompson Valley 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 Thompson Valley Reservoir?
Thompson Valley Reservoir has a dam height of 48 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 Thompson Valley Reservoir last inspected?
Thompson Valley Reservoir was last inspected on April 8, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.