Timothy Lake
Key Takeaway
Timothy Lake is classified as high hazard in Oregon. It was completed in 1956 and is 70 years old. Its primary use is hydroelectric. 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 | 100 ft (taller than 93.9% in OR) |
| Dam Length | 740 ft |
| Dam Type | Earth |
| Max Storage | 69.0K acre-ft |
| Normal Storage | 66.0K acre-ft |
| Surface Area | 1,430 acres |
| Drainage Area | 54 sq mi |
| Max Discharge | 16,000 cfs |
| Year Completed | 1956 (70 years old) |
| NID ID | OR00545 |
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
Portland General Electric Company
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Timothy Lake?
Timothy Lake 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 Timothy Lake?
Timothy Lake is owned by Portland General Electric Company (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Timothy Lake built?
Timothy Lake was completed in 1956, making it 70 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 Timothy Lake?
Timothy Lake serves the following purposes: Hydroelectric, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Timothy Lake?
Timothy Lake has a dam height of 100 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 Timothy Lake last inspected?
Timothy Lake was last inspected on September 20, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.