Lakes / Oregon / Crook County / Grindstone Reservoir
Grindstone Reservoir, Oregon
35 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Oregon
43.97 degrees N, 119.72 degrees W - Crook County. State and county outlines drawn from Census boundary data; the lake marker is placed by its USGS National Hydrography Dataset coordinates, not by eye. Schematic - not a survey map.
How Grindstone Reservoir Stacks Up
- Larger than 17% of the 642 lakes counted in Oregon.
- About 80 miles from Bend, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Williams Reservoir | Harney | 2.3 mi | 67 acres |
| Delintment Lake | Harney | 7.1 mi | 62 acres |
| Lillard Reservoir | Crook | 8.8 mi | 43 acres |
| Yellowjacket Lake | Harney | 23 mi | 33 acres |
| Sheep Lake | Harney | 27 mi | 351 acres |
| Zoglmann Reservoir | Harney | 28 mi | 46 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Grindstone Reservoir
How Big Is Grindstone Reservoir?
Grindstone Reservoir covers 35 acres in Crook County, Oregon.
What Is the Largest Lake in Crook County?
Prineville Reservoir is the largest lake in Crook County, at 2,861 acres.
Largest Lakes in Oregon
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Upper Klamath Lake | Klamath | 62,095 acres | - |
| 2 | Lake Umatilla | Morrow | 50,042 acres | - |
| 3 | Lake Abert | Lake | 37,137 acres | - |
| 4 | Summer Lake | Lake | 31,602 acres | - |
| 5 | Harney Lake | Harney | 31,290 acres | - |
All 642 Oregon lakes ranked by surface area
Sources: USGS NHD (The National Map NHD MapServer layer 12) named waterbodies FTYPE 390/436; counties via Census point-in-polygon lake data (ID 145326332). Verified October 30, 2026.