Thomas Lake

Portage County, Wisconsin

OverviewFacts & Figures

Physical Characteristics

Surface Area (Acres)32
Maximum Depth (ft)28
Mean Depth (ft)17
Shoreline (miles)
Bottom Composition99% sand, 0% gravel, 0% rock, 0% muck
Water Clarity — Secchi Depth (ft)
Trophic Status
Drainage BasinSEEPAGE
Lake Classlake
Public Access
Township
GPS Coordinates44.47360° N, 89.39030° W
WBIC (DNR ID)200300

Fish Species

4 species documented

AbundantCommonPresentRare
SpeciesAbundanceLast Survey
Largemouth BassCommon
PanfishCommon
Northern PikePresent
TroutPresent

Boat Landings

1 landing

NameTypeRampTrailersFee
Public Boat LandingPublic

Invasive Species

Invasive species have been documented in or near this lake. Please clean, drain, and dry all watercraft and equipment before leaving to prevent spread.

SpeciesStatusFirst Detected
Banded Mystery SnailConfirmed
Chinese Mystery SnailConfirmed
Curly-Leaf PondweedConfirmed
Eurasian Water-MilfoilConfirmed
Phragmites (non-native)Confirmed

Data sourced from Wisconsin DNR lake surveys. Last scraped: 3/24/2026.

Thomas Lake — Facts & Figures | Stay Northern