Lakes / Wisconsin / Grassy Lake
Grassy Lake, Columbia County, Wisconsin
250 acres
Surface Area
957 ft
Surface Elevation
Where It Sits, and How Deep It Goes
Locator - Wisconsin
43.42 degrees N, 89.17 degrees W - Columbia County. State and county outlines drawn from Census boundary data; the lake marker is placed by its DNR coordinates, not by eye. Schematic - not a survey map.
Facts and Figures
Waterbody ID (WBIC)776400
CountyColumbia
Coordinates43.4242, -89.1697
Deepest Natural Lakes in Wisconsin
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Green Lake | Green Lake | 7,920 acres | 236 ft |
| 2 | Geneva Lake | Walworth | 5,401 acres | 135 ft |
| 3 | Elkhart Lake | Sheboygan | 292 acres | 119 ft |
| 4 | Trout Lake | Vilas | 3,864 acres | 117 ft |
| 5 | Beaver Dam Lake | Barron | 1,163 acres | 106 ft |
Largest Lakes in Wisconsin
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Lake Winnebago | Winnebago, Fond du Lac, Calumet | 131,939 acres | 21 ft |
| 2 | Lake Pepin | Pierce, Buffalo, Pepin | 24,550 acres | 60 ft |
| 3 | Petenwell Lake | Adams, Wood, Juneau | 23,173 acres | 44 ft |
| 4 | Lake Chippewa | Sawyer | 14,593 acres | 92 ft |
| 5 | Lake Poygan | Winnebago, Waushara | 14,024 acres | 11 ft |
Sources: Wisconsin DNR lake data (WBIC 776400); USGS. Verified October 28, 2026.