Lakes / Oregon / Morrow County / Lake Umatilla
Lake Umatilla, Oregon
50,042 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Oregon
45.82 degrees N, 119.95 degrees W - Morrow 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 Lake Umatilla Stacks Up
- Ranks #2 for surface area among the Oregon lakes counted so far - 50,042 acres.
- The largest lake in Morrow County among those counted.
- About 134 miles from Portland, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Willow Lake | Gilliam | 4.0 mi | 307 acres |
| Carty Reservoir | Morrow | 11 mi | 1,025 acres |
| McCormack Slough | Morrow | 18 mi | 248 acres |
| Cold Springs Reservoir | Umatilla | 38 mi | 1,440 acres |
| Willow Creek Reservoir | Morrow | 38 mi | 154 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Lake Umatilla
How Big Is Lake Umatilla?
Lake Umatilla covers 50,042 acres in Morrow County, Oregon.
What Is the Largest Lake in Morrow County?
Lake Umatilla is the largest lake in Morrow County, at 50,042 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 152909941). Verified October 30, 2026.