Lakes / Washington / Osoyoos Lake
Osoyoos Lake, Okanogan County, Washington
3,706 acres
Surface Area
About 75 ft
Max Depth (Approximate)
912 ft
Surface Elevation
Where It Sits, and How Deep It Goes
Locator - Washington
49.04 degrees N, 119.47 degrees W - Okanogan County. State and county outlines drawn from Census boundary data; the lake marker is placed by its Washington DFW coordinates, not by eye. Schematic - not a survey map.
Depth Profile - Osoyoos Lake
Schematic cross-section drawn to one shared depth scale - not a survey or bathymetric map. Max depth is approximate, from Washington Dept. of Ecology bathymetry.
How Osoyoos Lake Stacks Up
- The largest lake in Okanogan County among those counted.
- About 134 miles from Spokane, as the crow flies.
Facts and Figures
Waterbody ID{6B60C6FC-17EC-4F79-856C-46E9C2F54B83}
CountyOkanogan
Lake TypeLake
Coordinates49.0444, -119.4697
Largest Lakes in Washington
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Franklin D Roosevelt Lake | Ferry | 71,323 acres | - |
| 2 | Lake Umatilla | Klickitat | 50,042 acres | - |
| 3 | Lake Chelan | Chelan | 32,677 acres | About 1,500 ft |
| 4 | Banks Lake | Grant | 26,879 acres | - |
| 5 | Lake Wallula | Benton | 26,343 acres | - |
Sources: USGS NHD via WA Dept of Ecology lake data (ID {6B60C6FC-17EC-4F79-856C-46E9C2F54B83}); Washington Dept. of Ecology bathymetry (approximate max depth). Verified October 30, 2026.