Lake Du Bay

Marathon, Portage County, Wisconsin

OverviewFacts & Figures

Physical Characteristics

Surface Area (Acres)4,649
Maximum Depth (ft)30
Mean Depth (ft)—
Shoreline (miles)—
Bottom Composition0% sand, 0% gravel, 0% rock, 25% muck
Water Clarity — Secchi Depth (ft)—
Trophic Status—
Drainage BasinDRAINAGE
Lake Classflowage
Public Access—
Township—
GPS Coordinates44.69660° N, 89.68700° W
WBIC (DNR ID)1412200

Fish Species

6 species documented

AbundantCommonPresentRare
SpeciesAbundanceLast Survey
WalleyeAbundant—
Northern PikeCommon—
PanfishCommon—
Smallmouth BassCommon—
Largemouth BassPresent—
MuskyPresent—

Boat Landings

4 landings

NameTypeRampTrailersFee♿
Lake Du Bay AccessRAMP—16-20NoNo
Seagull RampRAMP—6-10NoNo
Lake Du Bay AccessRAMP—1-5NoNo
Big Eau Pleine River AccessRAMP—UnknownNo—

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
Chinese Mystery SnailConfirmed—
Curly-Leaf PondweedConfirmed—
Eurasian Water-MilfoilConfirmed—
Japanese knotweed (Fallopia japonica)Confirmed—
Purple LoosestrifeConfirmed—
Rusty CrayfishConfirmed—

Data sourced from Wisconsin DNR lake surveys. Last scraped: 4/29/2026.