Lakes in Union County, Oregon
13 lakes counted in Union County - the largest is Thief Valley Reservoir at 751 acres.
13
Lakes Counted
751 acres
Largest - Thief Valley Reservoir
Union County, highlighted, with its largest counted lakes dotted. Outlines from Census boundary data.
All Counted Lakes
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Thief Valley Reservoir | Union | 751 acres | - |
| 2 | Pilcher Creek Reservoir | Union | 218 acres | - |
| 3 | Wolf Creek Reservoir | Union | 195 acres | - |
| 4 | Conley Lake | Union | 120 acres | - |
| 5 | Jubilee Lake | Union | 92 acres | - |
| 6 | Morgan Lake | Union | 60 acres | - |
| 7 | Glacier Lake | Union | 53 acres | - |
| 8 | Shaw Reservoir | Union | 47 acres | - |
| 9 | Fisk Reservoir | Union | 40 acres | - |
| 10 | Eagle Lake | Union | 35 acres | - |
| 11 | La Grande Reservoir | Union | 33 acres | - |
| 12 | Echo Lake | Union | 28 acres | - |
| 13 | Lookingglass Lake | Union | 28 acres | - |
Sources: USGS National Hydrography Dataset lake data; USGS. Verified October 30, 2026.