Lemolo No 1
Key Takeaway
Lemolo No 1 is classified as high hazard in Oregon. It was completed in 1955 and is 71 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 | 120 ft (taller than 95.7% in OR) |
| Dam Length | 885 ft |
| Dam Type | Rockfill |
| Max Storage | 19.0K acre-ft |
| Normal Storage | 11.1K acre-ft |
| Surface Area | 419 acres |
| Drainage Area | 175 sq mi |
| Max Discharge | 16,300 cfs |
| Year Completed | 1955 (71 years old) |
| NID ID | OR00556 |
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
PacifiCorp
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Lemolo No 1?
Lemolo No 1 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 Lemolo No 1?
Lemolo No 1 is owned by PacifiCorp (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lemolo No 1 built?
Lemolo No 1 was completed in 1955, making it 71 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 Lemolo No 1?
Lemolo No 1 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 Lemolo No 1?
Lemolo No 1 has a dam height of 120 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 Lemolo No 1 last inspected?
Lemolo No 1 was last inspected on May 9, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.