Of the 2 Wisconsin lakes here with a published full pool, 1 is at or above full pool and 1 sits below it. Another 3 have no full-pool figure and read against their own records instead. The newest reading on this page is from October 1, 2026.
| Lake | Level now | Full pool | Against full pool | Reading |
|---|---|---|---|---|
| Geneva Lake Natural lake; USGS gauge | 864.48 ft | not published | Current reading shown; this gauge's public record is too short for seasonal comparisons. | October 1, 2026 |
| Lake Koshkonong Rock-Koshkonong Lake District (Indianford Dam) | 776.63 ft | not published | Current reading shown; this gauge's public record is too short for seasonal comparisons. | October 1, 2026 |
| Lake Winnebago Natural lake regulated by USACE (Fox River); USGS gauge | 746.90 ft | not published | Current reading shown; this gauge's public record is too short for seasonal comparisons. | October 1, 2026 |
| Eau Galle Reservoir USACE St. Paul District | 940.24 ft | 940.00 ft | 0.2 ft above full pool — on the low side for early October | October 1, 2026 |
| Lake Mendota Dane County Land & Water Resources (Tenney Lock and Dam) | 850.04 ft | 850.10 ft | 0.1 ft below full pool — this gauge's public record is too short for seasonal comparisons | October 1, 2026 |
“Full pool” means the conservation pool — what that is, and what it is not. Lakes with no published figure are read against their own seasonal record instead.
Wisconsin lake levels, asked and answered
What are the lake levels in Wisconsin today?
Of the 2 Wisconsin lakes here with a published full pool, 1 is at or above full pool and 1 sits below it. Another 3 have no full-pool figure and read against their own records instead. The newest reading on this page is from October 1, 2026.
Which Wisconsin lake is furthest below full pool?
Lake Mendota is the furthest down of the Wisconsin lakes on this page, at 0.1 ft below its full pool.
Where do these Wisconsin lake levels come from?
Each row is the gauge the agency that runs the lake publishes — the Corps of Engineers, the Bureau of Reclamation, the state water agency or the US Geological Survey, depending on the lake. Open a lake and its own page re-reads that gauge as the page loads, wherever the agency lets a browser do it.