Three Mile Flat Reservoir
Key Takeaway
Three Mile Flat Reservoir is classified as low hazard in Oregon. It was completed in 1964 and is 62 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 25 ft (taller than 43.9% in OR) |
| Dam Length | 3,100 ft |
| Dam Type | Earth |
| Max Storage | 1.4K acre-ft |
| Normal Storage | 950 acre-ft |
| Surface Area | 140 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 928 cfs |
| Year Completed | 1964 (62 years old) |
| NID ID | OR00186 |
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
WILLOW VALLEY RANCH, C/O DARREL BAGLEY
Private
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What is the hazard classification of Three Mile Flat Reservoir?
Three Mile Flat Reservoir 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 Three Mile Flat Reservoir?
Three Mile Flat Reservoir is owned by WILLOW VALLEY RANCH, C/O DARREL BAGLEY (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Three Mile Flat Reservoir built?
Three Mile Flat Reservoir was completed in 1964, making it 62 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 Three Mile Flat Reservoir?
Three Mile Flat Reservoir serves the following purposes: Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Three Mile Flat Reservoir?
Three Mile Flat Reservoir has a dam height of 25 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 Three Mile Flat Reservoir last inspected?
Three Mile Flat Reservoir was last inspected on August 3, 2017. Inspection dates indicate when a formal review occurred, not the results of that inspection.