Lakes / Washington / Mallard Marsh
Mallard Marsh, Washington
36 acres
Surface Area
2,424 ft
Surface Elevation
Where It Sits, and How Deep It Goes
Locator - Washington
48.15 degrees N, 117.22 degrees W - Pend Oreille 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 ID129647204
CountyPend Oreille
Lake TypeLake
Coordinates48.1512, -117.2230
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 129647204). Verified October 30, 2026.