Lakes / Oregon / Columbia County / Deer Island Slough
Deer Island Slough, Oregon
46 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Oregon
45.97 degrees N, 122.85 degrees W - Columbia 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 Deer Island Slough Stacks Up
- Larger than 32% of the 642 lakes counted in Oregon.
- About 32 miles from Portland, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Swan Lake | Columbia | 0.8 mi | 26 acres |
| Resting Lake | Columbia | 1.3 mi | 114 acres |
| Millionaire Lake | Columbia | 9.6 mi | 26 acres |
| Scappoose Bay | Columbia | 9.8 mi | 300 acres |
| Henrici Lake | Columbia | 10 mi | 85 acres |
| Cunningham Lake | Columbia | 11 mi | 157 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Deer Island Slough
How Big Is Deer Island Slough?
Deer Island Slough covers 46 acres in Columbia County, Oregon.
What Is the Largest Lake in Columbia County?
Scappoose Bay is the largest lake in Columbia County, at 300 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 129414113). Verified October 30, 2026.