Middle
Key Takeaway
Middle is classified as high hazard in Oregon. It was completed in 1940 and is 86 years old. Its primary use is water supply. 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 | 39 ft (taller than 75.8% in OR) |
| Dam Length | 410 ft |
| Dam Type | Earth |
| Max Storage | 168 acre-ft |
| Normal Storage | 168 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 50 cfs |
| Year Completed | 1940 (86 years old) |
| NID ID | OR00135 |
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
CITY OF ASTORIA
Local Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Middle?
Middle 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 Middle?
Middle is owned by CITY OF ASTORIA (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Middle built?
Middle was completed in 1940, making it 86 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 Middle?
Middle serves the following purposes: Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Middle?
Middle has a dam height of 39 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 Middle last inspected?
Middle was last inspected on August 18, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.