Lakes / Oregon / Morrow County
Lakes in Morrow County, Oregon
5 lakes counted in Morrow County - the largest is Lake Umatilla at 50,042 acres.
5
Lakes Counted
50,042 acres
Largest - Lake Umatilla
Morrow County, highlighted, with its largest counted lakes dotted. Outlines from Census boundary data.
All Counted Lakes
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Lake Umatilla | Morrow | 50,042 acres | - |
| 2 | Carty Reservoir | Morrow | 1,025 acres | - |
| 3 | McCormack Slough | Morrow | 248 acres | - |
| 4 | Willow Creek Reservoir | Morrow | 154 acres | - |
| 5 | Lake Penland | Morrow | 62 acres | - |
Sources: USGS National Hydrography Dataset lake data; USGS. Verified October 30, 2026.