Lakes / Wisconsin / Green Lake
Green Lake, Green Lake County, Wisconsin
The Deepest Natural Lake in Wisconsin - 236 Feet of Cold, Clear Water.
Where It Sits, and How Deep It Goes
Locator - Wisconsin
43.81 degrees N, 89.00 degrees W - Green Lake 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.
Depth Profile - Green Lake
Average Depth - Green Lake vs. the State
Schematic cross-section drawn to one shared depth scale - not a survey or bathymetric map. The benchmark is the state itself: Wisconsin Lakes defines a shallow lake as under 20 ft at its deepest, with an average depth under 10 ft.
How Green Lake Stacks Up
- The deepest natural lake counted in Wisconsin - 236 ft at its deepest.
- The largest lake in Green Lake County among those counted.
- Its average depth of 104 ft is more than 10 times a typical shallow Wisconsin lake, which averages under 10 ft.
- About 55 miles from Madison, as the crow flies.
Fish Species
Species recorded for this lake. Presence only - no abundance ratings.
The Character of the Lake
A two-story fishery: warm-water species live in the sunlit upper layer while a cold, oxygenated deep layer holds lake trout and cisco all summer - a combination almost no other Wisconsin inland lake can support.
Signature species: Lake Trout, Cisco.
Facts and Figures
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 |