Twin Lake-Upper
Key Takeaway
Twin Lake-Upper is classified as low hazard in Oregon. It was completed in 1908 and is 118 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 10 ft (taller than 0.6% in OR) |
| Dam Length | 65 ft |
| Dam Type | Concrete |
| Max Storage | 150 acre-ft |
| Normal Storage | 150 acre-ft |
| Surface Area | 17 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 51 cfs |
| Year Completed | 1908 (118 years old) |
| NID ID | OR00609 |
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
PINE LAKES DITCH & RES. COMPANY
Private
Nearby Dams
Twin Lake-Lower
Baker, OR
Low Hazard 22 ftCrater Lake
Baker, OR
Low Hazard 31 ftEast Lakes Creek
Baker, OR
Low Hazard 15 ftClear Creek Reservoir-West Fork
Baker, OR
Significant Hazard 16 ftLooking Glass Reservoir
Union, OR
Low Hazard 13 ftEagle Lake Dam
Union, OR
Low Hazard 33 ftMehlhorn and Bassett
Baker, OR
Low Hazard 20 ftSugarloaf Reservoir
Baker, OR
Low Hazard 27 ftFrequently Asked Questions
What is the hazard classification of Twin Lake-Upper?
Twin Lake-Upper 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 Twin Lake-Upper?
Twin Lake-Upper is owned by PINE LAKES DITCH & RES. COMPANY (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Twin Lake-Upper built?
Twin Lake-Upper was completed in 1908, making it 118 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 Twin Lake-Upper?
Twin Lake-Upper 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 Twin Lake-Upper?
Twin Lake-Upper has a dam height of 10 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 Twin Lake-Upper last inspected?
Twin Lake-Upper was last inspected on August 13, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.