Lakes / Oregon / Malheur County / Rockhouse Reservoir
Rockhouse Reservoir, Oregon
37 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Oregon
42.70 degrees N, 117.57 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 Rockhouse Reservoir Stacks Up
- Larger than 19% of the 642 lakes counted in Oregon.
- About 210 miles from Bend, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Blevins Reservoir | Malheur | 1.7 mi | 44 acres |
| Scott Reservoir | Malheur | 3.8 mi | 101 acres |
| Little Grassy Reservoir | Malheur | 15 mi | 334 acres |
| Rock Creek Reservoir | Malheur | 16 mi | 192 acres |
| Upper Dry Lake Number 1 | Malheur | 17 mi | 31 acres |
| Peacock Lake | Malheur | 18 mi | 41 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Rockhouse Reservoir
How Big Is Rockhouse Reservoir?
Rockhouse Reservoir covers 37 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 146722352). Verified October 30, 2026.