Trillium Lake
Key Takeaway
Trillium Lake is classified as low hazard in Oregon. It was completed in 1960 and is 66 years old. Its primary use is recreation.
Physical Details
| Dam Height | 19 ft (taller than 27.8% in OR) |
| Dam Length | 985 ft |
| Dam Type | Earth |
| Max Storage | 380 acre-ft |
| Normal Storage | 353 acre-ft |
| Surface Area | 65 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 450 cfs |
| Year Completed | 1960 (66 years old) |
| NID ID | OR00350 |
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
OREGON DEPARTMENT OF FISH AND WILDLIFE
State Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Trillium Lake?
Trillium Lake 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 Trillium Lake?
Trillium Lake is owned by OREGON DEPARTMENT OF FISH AND WILDLIFE (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Trillium Lake built?
Trillium Lake was completed in 1960, making it 66 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 Trillium Lake?
Trillium Lake serves the following purposes: Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Trillium Lake?
Trillium Lake has a dam height of 19 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 Trillium Lake last inspected?
Trillium Lake was last inspected on June 12, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.