Lakes / Oregon / Malheur County / Little Grassy Reservoir
Little Grassy Reservoir, Oregon
334 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Oregon
42.81 degrees N, 117.32 degrees W - Malheur 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 Little Grassy Reservoir Stacks Up
- Larger than 79% of the 642 lakes counted in Oregon.
- About 219 miles from Bend, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Rock Creek Reservoir | Malheur | 5.5 mi | 192 acres |
| Deary Reservoir | Malheur | 7.1 mi | 33 acres |
| Antelope Reservoir | Malheur | 7.4 mi | 3,622 acres |
| Parsnip Creek Diversion Reservoir | Malheur | 8.6 mi | 33 acres |
| Jaca Reservoir | Malheur | 9.4 mi | 814 acres |
| Upper Dry Lake Number 1 | Malheur | 9.8 mi | 31 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Little Grassy Reservoir
How Big Is Little Grassy Reservoir?
Little Grassy Reservoir covers 334 acres in Malheur County, Oregon.
What Is the Largest Lake in Malheur County?
Lake Owyhee is the largest lake in Malheur County, at 11,120 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 131375986). Verified October 30, 2026.