Lakes / Washington / Big Twin Lake
Big Twin Lake, Mason County, Washington
81 acres
Surface Area
172 ft
Surface Elevation
Where It Sits, and How Deep It Goes
Locator - Washington
47.23 degrees N, 122.98 degrees W - Mason 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.
Facts and Figures
Waterbody ID155197657
CountyMason
Lake TypeLake
Coordinates47.2279, -122.9750
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 155197657). Verified October 30, 2026.