Lakes / Washington / Mason Lake
Mason Lake, Mason County, Washington
977 acres
Surface Area
About 90 ft
Max Depth (Approximate)
196 ft
Surface Elevation
Where It Sits, and How Deep It Goes
Locator - Washington
47.34 degrees N, 122.96 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.
Depth Profile - Mason 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 Mason Lake Stacks Up
- About 21 miles from Olympia, as the crow flies.
- 6 fish species on the WDFW list for this lake.
Fish Species
Brown bullheadKokaneeLargemouth bassNorthern pikeminnowRainbow troutYellow perch
Species recorded for this lake. Presence only - no abundance ratings.
Facts and Figures
Waterbody ID155197196
CountyMason
Lake TypeLake
Coordinates47.3351, -122.9574
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: Washington DFW; USGS NHD via WA Dept of Ecology lake data (ID 155197196); Washington Dept. of Ecology bathymetry (approximate max depth). Verified October 30, 2026.