WI · ranked by public data
2 Marathon County lakes are at least 50 acres with a current DNR water-clarity reading, out of 61 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
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 — 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.