Lakes / Wisconsin / Deepest Natural Lakes in Wisconsin
Deepest Natural Lakes in Wisconsin
Ranked by maximum depth, from Wisconsin DNR lake data. Only natural lakes are ranked - Lake Wazee, a flooded iron mine at about 350 ft, is deeper than every lake on this list but is man-made, and deep reservoirs are excluded for the same reason.
| # | 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 | Little Trout Lake | Vilas | 1,007 acres | 98 ft |
| 6 | Lake Owen | Bayfield | 1,250 acres | 95 ft |
| 7 | Lake Mendota | Dane | 9,781 acres | 83 ft |
| 8 | Long Lake | Washburn | 3,478 acres | 74 ft |
| 9 | Lake Pepin | Pierce, Buffalo, Pepin | 24,550 acres | 60 ft |
| 10 | Lake Winnebago | Winnebago, Fond du Lac, Calumet | 131,939 acres | 21 ft |
| 11 | Lake Poygan | Winnebago, Waushara | 14,024 acres | 11 ft |
| 12 | Lake Butte des Morts | Winnebago | 8,581 acres | 9 ft |
| 13 | Lake Winneconne | Winnebago | 4,553 acres | 9 ft |
Source: Wisconsin DNR lake data. Verified October 28, 2026. New lakes are added as their DNR records are verified - rankings update with every addition.