WI · ranked by public data
3 Marathon County lakes are at least 50 acres with a current DNR water-clarity reading, out of 69 documented lakes in the county. Updated July 2026.
Marathon County, WI
9 ft water clarity (Sep 2025) · 177 acres, 13 ft max depth · 1 public landing
Marathon County, WI
3.9 ft water clarity (Sep 2025) · 204 acres, 34 ft max depth · 1 public landing
Marathon County, WI
1 ft water clarity (Jul 2026) · 6,348 acres, 46 ft max depth · 12 public landings
Methodology
FAQ
Big Bass Lake — By most recent Secchi reading, Big Bass Lake in Marathon County is the clearest monitored lake in Marathon County, with 9 feet of visibility.
Source data: Wisconsin DNR lake and monitoring records as aggregated by LakeList. Figures reflect the most recent documented values, not new surveys, and conditions change — 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.