WI · ranked by public data
9 Jefferson County lakes are at least 50 acres with a documented maximum depth, out of 28 documented lakes in the county. Updated July 2026.
Jefferson County, WI
60 ft maximum depth · 1,365 acres · 5 public landings
Jefferson County, WI
44 ft maximum depth · 420 acres · 2 public landings
Jefferson County, WI
27 ft maximum depth · 136 acres · 1 public landing
Jefferson County, WI
24 ft maximum depth · 108 acres · No verified public access
Jefferson County, WI
22 ft maximum depth · 84 acres · No verified public access · DNR impairment listed
Jefferson County, WI
11 ft maximum depth · 105 acres · 1 public landing
Jefferson County, WI
10 ft maximum depth · 72 acres · No verified public access
Jefferson County, WI
7 ft maximum depth · 10,595 acres · 4 public landings · DNR impairment listed
Jefferson County, WI
6 ft maximum depth · 344 acres · 1 public landing
Methodology
FAQ
Rock Lake — Rock Lake in Jefferson County is the deepest documented lake in Jefferson County, at 60 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.