Lakes / North Dakota / Flat Lake
Flat Lake, North Dakota
278.5 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - North Dakota
48.00 degrees N, 100.31 degrees W - McHenry County. State and county outlines drawn from Census boundary data; the lake marker is placed by its North Dakota Game and Fish coordinates, not by eye. Schematic - not a survey map.
Facts and Figures
Waterbody ID144409809
CountyMcHenry
Coordinates47.9970, -100.3085
Deepest Natural Lakes in North Dakota
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Stump Lake | Nelson | 17,681 acres | 77.1 ft |
| 2 | Devils Lake | Ramsey | 110,763 acres | 58.1 ft |
| 3 | Free Peoples Lake | Benson | 891 acres | 55.3 ft |
| 4 | Spiritwood Lake | Stutsman | 493 acres | 54.7 ft |
| 5 | Moon Lake | Barnes | 115 acres | 54.3 ft |
Largest Lakes in North Dakota
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Lake Sakakawea | McLean | 350,520 acres | 180 ft |
| 2 | Lake Oahe | Emmons | 309,912.6 acres | 200 ft |
| 3 | Devils Lake | Ramsey | 110,763 acres | 58.1 ft |
| 4 | Stump Lake | Nelson | 17,681 acres | 77.1 ft |
| 5 | Long Lake | Burleigh | 16,934 acres | - |
Sources: USGS NHD lake data (ID 144409809). Verified October 30, 2026.