WI · ranked by public data
6 Fond du Lac County lakes are at least 50 acres with a documented maximum depth, out of 33 documented lakes in the county. Updated July 2026.
Fond du Lac County, WI
47 ft maximum depth · 423 acres · 1 public landing
Fond du Lac County, WI
47 ft maximum depth · 75 acres · 1 public landing
Fond du Lac County, WI
32 ft maximum depth · 51 acres · 1 public landing
Fond du Lac County, WI
30 ft maximum depth · 209 acres · No verified public access
Fond du Lac County, WI
29 ft maximum depth · 90 acres · 1 public landing
Fond du Lac County, WI
23 ft maximum depth · 70 acres · 1 public landing · DNR impairment listed
Methodology
FAQ
Long Lake — Long Lake in Fond du Lac County is the deepest documented lake in Fond du Lac County, at 47 feet maximum depth.
Source data: Wisconsin DNR lake and monitoring records as aggregated by LakeList. Figures reflect the most recent documented values, not new surveys — verify access and rules before you go. Lake outlines are shoreline shapes from LakeList and the USGS National Hydrography Dataset; they illustrate a lake's form and are not depth or navigation charts.