Upper Midway
Key Takeaway
Upper Midway is classified as low hazard in Oregon. It was completed in 1959 and is 67 years old. Its primary use is irrigation.
Physical Details
| Dam Length | 1,095 ft |
| Dam Type | Gravity |
| Max Storage | 423 acre-ft |
| Normal Storage | 286 acre-ft |
| Surface Area | 286 acres |
| Max Discharge | 6,903 cfs |
| Year Completed | 1959 (67 years old) |
| NID ID | OR00573 |
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
DOI BLM
Federal Government
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What is the hazard classification of Upper Midway?
Upper Midway 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 Upper Midway?
Upper Midway is owned by DOI BLM (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Upper Midway built?
Upper Midway was completed in 1959, making it 67 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 Upper Midway?
Upper Midway serves the following purposes: Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Upper Midway last inspected?
Upper Midway was last inspected on September 15, 2017. Inspection dates indicate when a formal review occurred, not the results of that inspection.