Grindstone Reservoir
Grindstone Reservoir is an earth dam located in Crook County, Oregon, built in 1964. It carries a Low hazard potential classification.
About Grindstone Reservoir
The primary purpose of Grindstone Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Grindstone Livestock Company (private). It impounds the Grindstone Creek near Paulina.
The dam stands 34 feet tall and stretches 530 feet across, creates a reservoir covering 39 acres, has a maximum storage capacity of 427 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1964, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 10/10/2019.
At 34 feet, this dam is taller than 80% of dams nationwide.
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Location
| State | Oregon |
| County | Crook |
| Nearest City | Paulina |
| River/Stream | Grindstone Creek |
| Coordinates | 43.97328, -119.71854 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 34 ft |
| Dam Height | 34 ft |
| Dam Length | 530 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 427 acre-ft |
| Max Storage | 427 acre-ft |
| Normal Storage | 427 acre-ft |
| Surface Area | 39 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 450 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | GRINDSTONE LIVESTOCK COMPANY |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 10/10/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00419 |
| Federal ID | OR00419 |
| More Info | State Dam Safety Program |