Lakes / Oregon / Union County / Thief Valley Reservoir
Thief Valley Reservoir, Oregon
751 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Oregon
45.03 degrees N, 117.80 degrees W - Union 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 Thief Valley Reservoir Stacks Up
- Larger than 86% of the 642 lakes counted in Oregon.
- The largest lake in Union County among those counted.
- About 186 miles from Bend, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Fisk Reservoir | Union | 6.2 mi | 40 acres |
| Shaw Reservoir | Union | 10 mi | 47 acres |
| Wolf Creek Reservoir | Union | 11 mi | 195 acres |
| Pilcher Creek Reservoir | Union | 13 mi | 218 acres |
| Balm Creek Reservoir | Baker | 15 mi | 73 acres |
| Smith Lake | Baker | 17 mi | 49 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Thief Valley Reservoir
How Big Is Thief Valley Reservoir?
Thief Valley Reservoir covers 751 acres in Union County, Oregon.
What Is the Largest Lake in Union County?
Thief Valley Reservoir is the largest lake in Union County, at 751 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 112955199). Verified October 30, 2026.