WI · ranked by public data
2 La Crosse County lakes are at least 50 acres with a documented maximum depth, out of 8 documented lakes in the county. Updated July 2026.
La Crosse County, WI
40 ft maximum depth · 8,391 acres · 7 public landings
La Crosse County, WI
11 ft maximum depth · 606 acres · 2 public landings · DNR impairment listed
Methodology
FAQ
Lake Onalaska — Lake Onalaska in La Crosse County is the deepest documented lake in La Crosse County, at 40 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.