Scanned Wisconsin DNR lake survey depth maps for Thomas Lake in Portage County, Wisconsin, converted so they can be panned and zoomed in the browser. Historical surveys — not for navigation.
Historical Wisconsin DNR maps
1 converted map sheet · 1 map-aligned. These historical surveys are not for navigation.
Navigable depth map
Pan, zoom, and inspect the converted Wisconsin DNR historical map image in the browser. Historical survey — not for navigation.

Source: Wisconsin DNR · WBIC 200300 · map alignment passed · Historical lake maps are not for navigation.
Source: Wisconsin Department of Natural Resources. Converted for browser access with source URLs, checksums, and retrieval dates retained. Historical lake maps are not for navigation.
Depth FAQ
Thomas Lake is 28 feet deep at its deepest point and averages about 17 feet, according to Wisconsin DNR records.
Yes. 1 scanned Wisconsin DNR lake survey map sheet is free to view and zoom on LakeList. These historical surveys are not for navigation.
The map sheets are converted from official Wisconsin DNR lake survey documents, with the source URL, checksum, and retrieval date retained for every sheet. Historical surveys are not for navigation.