Yoncalla Reservoir
Key Takeaway
Yoncalla Reservoir is classified as low hazard in Oregon. It was completed in 1983 and is 43 years old. Its primary use is water supply.
Physical Details
| Dam Height | 16 ft (taller than 20.1% in OR) |
| Dam Length | 2,000 ft |
| Dam Type | Earth |
| Max Storage | 112 acre-ft |
| Normal Storage | 112 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 28 cfs |
| Year Completed | 1983 (43 years old) |
| NID ID | OR00682 |
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
CITY OF YONCALLA
Local Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Yoncalla Reservoir?
Yoncalla 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 Yoncalla Reservoir?
Yoncalla Reservoir is owned by CITY OF YONCALLA (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Yoncalla Reservoir built?
Yoncalla Reservoir was completed in 1983, making it 43 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 Yoncalla Reservoir?
Yoncalla Reservoir 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 Yoncalla Reservoir?
Yoncalla Reservoir has a dam height of 16 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 Yoncalla Reservoir last inspected?
Yoncalla Reservoir was last inspected on January 22, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.