Olalla
Key Takeaway
Olalla is classified as high hazard in Oregon. It was completed in 1968 and is 58 years old. Its primary use is other. 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 | 83 ft (taller than 92.8% in OR) |
| Dam Length | 350 ft |
| Dam Type | Earth |
| Max Storage | 4.3K acre-ft |
| Normal Storage | 3.7K acre-ft |
| Surface Area | 64 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 355 cfs |
| Year Completed | 1968 (58 years old) |
| NID ID | OR00470 |
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
GEORGIA PACIFIC
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Olalla?
Olalla 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 Olalla?
Olalla is owned by GEORGIA PACIFIC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Olalla built?
Olalla was completed in 1968, making it 58 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 Olalla?
Olalla serves the following purposes: Other. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Olalla?
Olalla has a dam height of 83 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 Olalla last inspected?
Olalla was last inspected on August 14, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.