Grindstone Reservoir
Key Takeaway
Grindstone 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 | 34 ft (taller than 68.2% in OR) |
| Dam Length | 530 ft |
| Dam Type | Earth |
| Max Storage | 427 acre-ft |
| Normal Storage | 427 acre-ft |
| Surface Area | 40 acres |
| Drainage Area | 6 sq mi |
| Max Discharge | 450 cfs |
| Year Completed | 1964 (62 years old) |
| NID ID | OR00419 |
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
GRINDSTONE LIVESTOCK COMPANY
Private
Nearby Dams
Williams-Sherman Reservoir
Harney, OR
Low Hazard 25 ftLower Twelvemile (Buker Res)
Crook, OR
Low Hazard 23 ftBlack Snag Reservoir
Crook, OR
Low Hazard 38 ftDelintment Lake
Harney, OR
Low Hazard 21 ftLillard Dam
Crook, OR
Low Hazard 26 ftLayton #2 Reservoir
Crook, OR
Low Hazard 20 ftFreezeout Reservoir
Crook, OR
Low Hazard 24 ftFrequently Asked Questions
What is the hazard classification of Grindstone Reservoir?
Grindstone 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 Grindstone Reservoir?
Grindstone Reservoir is owned by GRINDSTONE LIVESTOCK COMPANY (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Grindstone Reservoir built?
Grindstone 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 Grindstone Reservoir?
Grindstone 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 Grindstone Reservoir?
Grindstone Reservoir has a dam height of 34 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 Grindstone Reservoir last inspected?
Grindstone Reservoir was last inspected on October 10, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.