Lakes / Washington / Wanapum Lake
Wanapum Lake, Washington
14,362 acres
Surface Area
577 ft
Surface Elevation
Where It Sits, and How Deep It Goes
Locator - Washington
47.10 degrees N, 120.02 degrees W - Grant 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.
How Wanapum Lake Stacks Up
- Ranks #8 for surface area among the Washington lakes counted so far - 14,362 acres.
- About 114 miles from Seattle, as the crow flies.
Facts and Figures
Waterbody ID{1601453E-7035-4F69-9632-88860E7EA559}
CountyGrant
Lake TypeLake
Coordinates47.0970, -120.0219
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 {1601453E-7035-4F69-9632-88860E7EA559}). Verified October 30, 2026.