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Thomas Lake
Enhanced dataHistorical depth chart
Thomas LakePortage County, WI
Historical source depth chart available1 converted source DNR map sheet can be panned and zoomed in the browser. Interactive contours stay hidden until visual QA passes. Historical survey — not for navigation.
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Fishing forecast
Best windows for Thomas Lake
Weather-based planning built from the National Weather Service hourly forecast near this lake.
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Checking wind, precipitation, and near-term weather windows.
Water temperature
Thomas Lake water temperature today
Modeled surface-temperature estimate built from seasonal climate, lake depth, and live National Weather Service air temperatures near this lake.
75°FPeak summer
Seasonal estimate. Checking current National Weather Service air temperatures…
Warmest water of the year. Fish hold deeper or feed in low light; swimming and watersports are at their best.
Estimates are modeled, not measured. Actual temperatures vary with depth, wind mixing, and recent weather — verify conditions before swimming, boating, or heading onto ice.
Official Wisconsin information
Plan with DNR sources
LakeList links to the authoritative record so you can verify maps, rules, and current notices before leaving.
Historical DNR depth maps1 converted map sheetView DNR depth mapHistorical map · not for navigationFishing regulationsVerify current seasons, limits, and restrictionsOfficial DNR lake pageFacts, advisories, boating, and water qualityWater quality reportsMonitoring stations, clarity, and DNR reportsInvasive speciesVerified, observed, and historical AIS recordsBoating ordinancesLocal slow-no-wake and water-use restrictionsFish consumption advisoriesStatewide and waterbody-specific health guidance
Historical depth maps are not for navigation. Verify regulations and access at the official source before your trip.
Historical Wisconsin DNR maps
Thomas Lake depth maps
1 converted map sheet · 1 map-aligned. These historical surveys are not for navigation.
Navigable depth map
Thomas Lake · sheet 1
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.
Official fishing intelligence
Fishing reports and forecasts
LakeList matched these official resources by exact lake name and county. Report text stays with the publisher.
Forecasts describe DNR survey findings and expected opportunities; they are not real-time catch reports or a guarantee of fishing conditions.
32surface acres
28max depth feet
1public access points
44.4735, -89.3905latitude, longitude
Access
Public access points
Boat launchAccess44.47182, -89.39086Managed by Wisconsin DNR
DNR verifiedDirections
Nearby
Trip-planning places
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Fishery
Notable species
Largemouth BassPanfishNorthern PikeTrout
Wisconsin DNR stocking
Fish stocking history
The latest published year is 2025, when 2,254 fish were recorded across 1 entry.
2025
Rainbow TroutErwin · Yearling
2,2549.1 in average
2024
Rainbow TroutErwin · Yearling
1,7678.9 in average
2023
Rainbow TroutErwin · Yearling
2,0498.6 in average
2022
Rainbow TroutErwin · Yearling
1,5988.8 in average
2021
Rainbow TroutErwin · Yearling
8499.0 in average
2021
Rainbow TroutErwin · Yearling
1,8148.3 in average
2020
Rainbow TroutErwin · Yearling
1,2928.5 in average
2019
Rainbow TroutErwin · Yearling
1,3398.6 in average
2018
Rainbow TroutErwin · Yearling
1,1898.5 in average
2017
Rainbow TroutErwin · Yearling
1,1779.7 in average
2016
Rainbow TroutErwin · Yearling
1,1829.1 in average
2015
Rainbow TroutErwin · Yearling
8519.4 in average
Showing the 12 most recent records from 17 published entries.
Depth FAQ
How deep is Thomas Lake?
Thomas Lake is 28 feet deep at its deepest point and averages about 17 feet, according to Wisconsin DNR records.
Is there a free depth map of Thomas Lake?
Yes. 1 scanned Wisconsin DNR lake survey map sheet is free to view and zoom on LakeList. These historical surveys are not for navigation.
Where does the Thomas Lake depth map come from?
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.
Trust and freshness
Where this lake data comes from
Wisconsin DNR Lake Mapsname, coordinates, county, source identifiers
LakeList record updated 2026-07-14
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